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Home >> Subaru >> 2017 >> Legacy 2.5i Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Control System (Diagnostics) (P0700 To P2099) (H6DO)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P1604: STARTABILITY Malfunction >> Notes

DTC P1604: STARTABILITY Malfunction: Notes

WARNING: This page is about a different variant/trim than selected.

DTC detecting condition: 

Immediately at fault recognition

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode. Ref. to OPERATION , Clear Memory Mode.
NOTE: This DTC may be detected even if fault does not occur in the vehicle. If the customer does not ask for inspection, perform the clear memory mode without inspection and return the vehicle to the user.

Wiring diagram: 

Engine Electrical System Ref. to WIRING DIAGRAM , Engine Electrical System.

Fig 1: Camshaft Position Sensor Wiring Diagram
G11583380Courtesy of SUBARU OF AMERICA, INC.
Fig 2: Fuel Injector Wiring Diagram
G11586527Courtesy of SUBARU OF AMERICA, INC.
Fig 3: Ignition Coil Wiring Diagram
G11586526Courtesy of SUBARU OF AMERICA, INC.
Fig 4: Intake Oil Flow Control Solenoid Valve Wiring Diagram
G11586530Courtesy of SUBARU OF AMERICA, INC.
Fig 5: Exhaust Oil Flow Control Solenoid Valve Wiring Diagram
G11586532Courtesy of SUBARU OF AMERICA, INC.
Fig 6: Mass Air Flow, Intake Air Temperature Sensor Circuit Diagram
G11586558Courtesy of SUBARU OF AMERICA, INC.
Fig 7: Engine Coolant Temperature Sensor Wiring Diagram
G11586572Courtesy of SUBARU OF AMERICA, INC.
Fig 8: Intake Camshaft Position Sensor Wiring Diagram
G11589080Courtesy of SUBARU OF AMERICA, INC.
Fig 9: Exhaust Camshaft Position Sensor Wiring Diagram
G11589087Courtesy of SUBARU OF AMERICA, INC.
Step Check Yes No
1 CHECK DTC.  Is any other DTC displayed? Check DTC using "List of Diagnostic Trouble Code (DTC)". Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) Go to step 2. 
2 CHECK IMMOBILIZER. 
Check the immobilizer. Ref. to BASIC DIAGNOSTIC PROCEDURE		 Is the check result OK? Go to step 3.  Repair the immobilizer. Ref. to BASIC DIAGNOSTIC PROCEDURE
3 CHECK FOR MALFUNCTION OCCURRENCE.  Is it possible to reproduce the faulty phenomenon or to identify the faulty condition? Go to step 29.  Go to step 4. 
4 CHECK FREEZE FRAME DATA. 
Using the Subaru Select Monitor, read the values in «Engine Speed» and «Control module voltage».
NOTE: For detailed operation procedures, refer to "Freeze Frame Data Display For Engine". Ref. to DISPLAY OF ENGINE FREEZE FRAME DATA , OPERATION, Subaru Select Monitor.
 Is the value of «Engine Speed» 0 rpm?
  • When the value of «Control module voltage» is less than 5 V: Check the battery. Ref. to INSPECTION , Battery.
  • When the value of «Control module voltage» is 5 V or more: Go to step 5. 
  • When the value of «Engine Speed» is less than 250 rpm: Go to step 11. 
  • When the value of «Engine Speed» is 250 rpm or more: Go to step 19. 
5 CHECK FREEZE FRAME DATA. 
Read the value of «Control module voltage» using Subaru Select Monitor.
NOTE: For detailed operation procedures, refer to "Freeze Frame Data Display For Engine". Ref. to DISPLAY OF ENGINE FREEZE FRAME DATA , OPERATION, Subaru Select Monitor.
 Is the value of «Control module voltage» less than 9 V? It is possible that the engine friction is too large. Check the engine. Ref. to INSPECTION , Engine Trouble in General.
  • When the value of «Control module voltage» changes in any one of freeze frame data: Go to step 6. 
  • When the value of «Control module voltage» does not change in all freeze frame data: Check the starter motor circuit. Ref. to STARTER MOTOR CIRCUIT , Diagnostics for Engine Starting Failure.
6 CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR.  Is the crankshaft position sensor installed correctly? Go to step 7.  Install the crankshaft position sensor correctly. Ref. to INSTALLATION , Crankshaft Position Sensor.
7 CHECK CRANKSHAFT POSITION SENSOR. 
Check the crankshaft position sensor. Ref. to INSPECTION , Crankshaft Position Sensor.		 Is the check result OK? Go to step 8.  Replace the crankshaft position sensor. Ref. to CRANKSHAFT POSITION SENSOR
8 CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance of harness between ECM connector and crankshaft position sensor connector.

Connector & terminal 
(E158) No. 40 - (E10) No. 1: 
(E158) No. 27 - (E10) No. 2: 		 Is the resistance less than 1 Ω? Go to step 9.  Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.
9 CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR. 
Measure the resistance between crankshaft position sensor connector and engine ground.
Connector & terminal 
(E10) No. 1 - Engine ground: 
(E10) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 10.  Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.
10 CHECK FOR MALFUNCTION OCCURRENCE. 
  1. Replace the crankshaft position sensor.

    Ref. to CRANKSHAFT POSITION SENSOR

  2. Check that the fault is removed.
 Is the fault removed? Perform the Clear Memory Mode to complete. Ref. to CLEAR MEMORY MODE Replace the ECM. Ref. to ENGINE CONTROL MODULE (ECM)
11 CHECK FREEZE FRAME DATA. 
Using the Subaru Select Monitor, read the values in «Coolant Temp.», «Ambient Temperature » and «Fuel Pump Duty».
NOTE: For detailed operation procedures, refer to "Freeze Frame Data Display For Engine". Ref. to DISPLAY OF ENGINE FREEZE FRAME DATA , OPERATION, Subaru Select Monitor.
 Is the value of «Coolant Temp.» 120°C (248°F) or more? Or, is the value of «Coolant Temp.» lower than «Ambient Temperature » by 15°C (27°F) or more? Replace the engine coolant temperature sensor. Ref. to ENGINE COOLANT TEMPERATURE SENSOR
  • When the value of «Fuel Pump Duty» is 60% or more: Go to step 12. 
  • When the value of «Fuel Pump Duty» is less than 60%: Check the fuel pump system. Ref. to DTC P0230 FUEL PUMP PRIMARY CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).
12 CHECK OF FUEL PUMP. 
  1. On the "Active Test" item, select «Fuel Pump Control (ON/OFF Dr.)» and perform ON/OFF switching.
    NOTE: For detailed operation procedures, refer to the "Active Test". Ref. to ACTIVE TEST
  2. Check if operating sound occurs in the fuel pump according to ON/OFF switching operation.
 Does the fuel pump emit operating sound? Go to step 14.  Go to step 13. 
13 CHECK OF FUEL PUMP. 
Check fuel pump. Ref. to INSPECTION , Fuel Pump.		 Is the check result OK? Check fuel pump system. Ref. to DTC P0230 FUEL PUMP PRIMARY CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). Replace the fuel pump. Ref. to FUEL PUMP
14 CHECK FUEL TANK. 
Check if any foreign matters such as iron powder exist in the fuel tank.		 Is there any foreign matter in the fuel tank? Remove foreign matter from the fuel tank. Go to step 15. 
15 CHECK FUEL PRESSURE. 
WARNING: Place "NO OPEN FLAMES" signs near the working area.
CAUTION: Be careful not to spill fuel.
Measure the fuel pressure. Ref. to INSPECTION , Fuel Pressure.
CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
 Is the measured value 340 - 400 kPa (3.5 - 4.1 kgf/cm2, 49 - 58 psi)? Go to step 16.  Check the fuel pump and fuel delivery line. Ref. to INSPECTION , Fuel Pump. Ref. to INSPECTION , Fuel Delivery and Evaporation Lines.
16 CHECK POWER SUPPLY CIRCUIT OF FUEL INJECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from fuel injector.
  3. Turn the ignition switch to ON.
  4. Measure the voltage in harness between fuel injector connector and engine ground.

Connector & terminal 
#1 (E5) No. 1 (+) - Engine ground (-): 
#2 (E16) No. 1 (+) - Engine ground (-): 
#3 (E6) No. 1 (+) - Engine ground (-): 
#4 (E17) No. 1 (+) - Engine ground (-): 
#5 (E43) No. 1 (+) - Engine ground (-): 
#6 (E44) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 17.  Repair the power supply circuit.
17 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Disconnect the connector from fuel injector.
  4. Measure the resistance of harness between ECM connector and fuel injector connector.

Connector & terminal 
#1 (E158) No. 23 - (E5) No. 2: 
#2 (E158) No. 8 - (E16) No. 2: 
#3 (E158) No. 9 - (E6) No. 2: 
#4 (E158) No. 22 - (E17) No. 2: 
#5 (E158) No. 52 - (E43) No. 2: 
#6 (E158) No. 13 - (E44) No. 2: 		 Is the resistance less than 1 Ω? Go to step 18.  Repair the open circuit of the harness between the ECM connector and fuel injector connector.
18 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR. 
Measure the resistance between the ECM connector and engine ground.
Connector & terminal 
#1 (E158) No. 23 - Engine ground: 
#2 (E158) No. 8 - Engine ground: 
#3 (E158) No. 9 - Engine ground: 
#4 (E158) No. 22 - Engine ground: 
#5 (E158) No. 52 - Engine ground: 
#6 (E158) No. 13 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 28.  Repair the short circuit to ground in harness between ECM connector and fuel injector connector.
19 CHECK FREEZE FRAME DATA. 
Using the Subaru Select Monitor, read the values in «Coolant Temp.», «Ambient Temperature » and «Engine Speed».
NOTE: For detailed operation procedures, refer to "Freeze Frame Data Display For Engine". Ref. to DISPLAY OF ENGINE FREEZE FRAME DATA , OPERATION, Subaru Select Monitor.
 Is the value of «Coolant Temp.» 120°C (248°F) or more? Or, is the value of «Coolant Temp.» lower than «Ambient Temperature » by 15°C (27°F) or more? Replace the engine coolant temperature sensor. Ref. to ENGINE COOLANT TEMPERATURE SENSOR
  • When the minimum value of «Engine Speed» is less than 300 rpm: Go to step 20. 
  • When the minimum value of «Engine Speed» is 300 rpm or more: It is possible that the engine compression pressure is not sufficient. Check the engine. Ref. to INSPECTION , Engine Trouble in General.
20 CHECK FUEL INJECTOR. 
Check fuel injector. Ref. to INSPECTION , Fuel Injector.		 Is there any deposit in the fuel injectors? Replace the fuel injector. Ref. to FUEL INJECTOR Go to step 21. 
21 CHECK FUEL TANK. 
Check if any foreign matters such as iron powder exist in the fuel tank.		 Is there any foreign matter in the fuel tank? Remove foreign matter from the fuel tank. Go to step 22. 
22 CHECK FREEZE FRAME DATA. 
Using the Subaru Select Monitor, read the value in «Coolant Temp.».
NOTE: For detailed operation procedures, refer to "Freeze Frame Data Display For Engine". Ref. to DISPLAY OF ENGINE FREEZE FRAME DATA , OPERATION, Subaru Select Monitor.
 Is the value of «Coolant Temp.» 40 - 90°C (104 - 194°F)? Go to step 24.  Go to step 23. 
23 CHECK FUEL PRESSURE. 
WARNING: Place "NO OPEN FLAMES" signs near the working area.
CAUTION: Be careful not to spill fuel.
Measure the fuel pressure five minutes after the engine is stopped. Ref. to INSPECTION , Fuel Pressure.
CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
NOTE: If the engine does not start, measure the fuel pressure five minutes after cranking is completed.
 Is the measured value 147 kPa (1.5 kgf/cm2, 21 psi) or more? Go to step 28.  Replace the pressure regulator. Ref. to FUEL FILTER
24 CHECK FUEL INJECTOR. 
  1. After the engine is stopped, scavenge inside of the intake manifold by applying compressed air.
  2. Measure the HC concentration inside the intake manifold 15 minutes after scavenging is completed.
NOTE:
  • Perform measurement using HC concentration gauge. If HC concentration gauge is not available, go to the next step.
  • For measuring HC concentration, remove the hose between intake manifold and purge control solenoid valve to measure the HC concentration in the intake manifold.
 Is the HC concentration less than 4, 000 ppm? Go to step 26.  Go to step 25. 
25 CHECK FUEL INJECTOR. 
Check fuel injector. Ref. to INSPECTION , Fuel Injector.		 Is the check result OK? Go to step 26.  Replace the fuel injector. Ref. to FUEL INJECTOR
26 CHECK THROTTLE BODY. 
Check throttle body. Ref. to INSPECTION , Throttle Body.		 Is there any deposit in the throttle body? Replace the throttle body. Ref. to THROTTLE BODY Go to step 27. 
27 CHECK AIR INTAKE SYSTEM. 
Check the installing condition of the air intake system.		 Are there holes, loose bolts or disconnection of hose on air intake system? Repair the air intake system. Ref. to GENERAL DESCRIPTION Go to step 28. 
28 CHECK FOR MALFUNCTION OCCURRENCE.  Is the fault removed? Perform the Clear Memory Mode to complete. Ref. to CLEAR MEMORY MODE Go to step 29. 
29 CHECK FOR MALFUNCTION OCCURRENCE.  Does cranking occur?
  • When the engine speed is abnormal during cranking: Go to step 36. 
  • When an initial combustion does not occur: Go to step 39. 
  • When the engine stalls immediately after engine start: Go to step 57. 
  • When the engine takes time to start: Go to step 80. 
 Go to step 30. 
30 CHECK FOR MALFUNCTION OCCURRENCE.  Does the sound occur by a protruding starter pinion gear during cranking?
  • When the starter motor does not rotate: Go to step 31. 
  • When the starter motor rotates but does not engage: Go to step 33. 
 Go to step 34. 
31 CHECK BATTERY. 
Check the battery. Ref. to INSPECTION , Battery.		 Is the check result OK? Go to step 32.  Charge or replace the battery. Ref. to BATTERY
32 CHECK ENGINE MAIN BODY. 
Using the ST, rotate the crankshaft.
ST 18252AA000 CRANKSHAFT SOCKET		 Does the crankshaft rotate smoothly? Check the starter motor. Ref. to INSPECTION , Starter.
NOTE: It is possible that the engine friction increased temporarily. Check if any foreign matter is mixed in engine oil. If a foreign matter is found, check the engine. Ref. to INSPECTION , Engine Trouble in General.
 It is possible that the engine friction is too large. Check the engine. Ref. to INSPECTION , Engine Trouble in General.
33 CHECK STARTER MOTOR. 
Check the starter motor. Ref. to INSPECTION , Starter.		 Is there any wear or damage in the starter pinion gear? Repair the starter motor. Ref. to STARTER Replace the torque converter assembly. Ref. to TORQUE CONVERTER ASSEMBLY
34 CHECK BATTERY. 
Check the battery. Ref. to INSPECTION , Battery.		 Is the check result OK? Go to step 35.  Charge or replace the battery. Ref. to BATTERY
35 CHECK STARTER MOTOR. 
Check the starter motor. Ref. to INSPECTION , Starter.		 Is the check result OK? Check the starter motor circuit. Ref. to STARTER MOTOR CIRCUIT , Diagnostics for Engine Starting Failure. Repair the starter motor. Ref. to STARTER
36 CHECK CURRENT DATA. 
Read the value of «Engine Speed» during cranking using Subaru Select Monitor.
NOTE: For detailed operation procedures, refer to "Current Data Display For Engine". Ref. to DISPLAY CURRENT ENGINE DATA , OPERATION, Subaru Select Monitor.
 Is the value of «Engine Speed» 300 rpm or more? It is possible that the compression pressure of the engine is not sufficient. Check the engine. Ref. to INSPECTION , Engine Trouble in General. Go to step 37. 
37 CHECK BATTERY. 
Check the battery. Ref. to INSPECTION , Battery.		 Is the check result OK? Go to step 38.  Charge or replace the battery. Ref. to BATTERY
38 CHECK ENGINE MAIN BODY. 
Using the ST, rotate the crankshaft.
ST 18252AA000 CRANKSHAFT SOCKET		 Does the crankshaft rotate smoothly? Check the starter motor. Ref. to INSPECTION , Starter.
NOTE: It is possible that the engine friction increased temporarily. Check if any foreign matter is mixed in engine oil. If a foreign matter is found, check the engine. Ref. to INSPECTION , Engine Trouble in General.
 It is possible that the engine friction is too large. Check the engine. Ref. to INSPECTION , Engine Trouble in General.
39 CHECK OPERATION OF EACH FUEL INJECTOR. 
Using a sound scope, check each fuel injector for operation sound during cranking.		 Does the fuel injector emit operating sound? Go to step 40.  Go to step 53. 
40 CHECK FUEL PRESSURE. 
WARNING: Place "NO OPEN FLAMES" signs near the working area.
CAUTION: Be careful not to spill fuel.
Measure the fuel pressure. Ref. to INSPECTION , Fuel Pressure.
CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
 Is the measured value 340 - 400 kPa (3.5 - 4.1 kgf/cm2 , 49 - 58 psi)? Go to step 41.  Go to step 51. 
41 CHECK IGNITION CONDITION. 
Check the ignition condition. Ref. to IGNITION CONTROL SYSTEM , Diagnostics for Engine Starting Failure.		 Is the check result OK? Go to step 42.  Go to step 45. 
42 CHECK FOR MALFUNCTION OCCURRENCE. 
Check for the condition of fault occurrence.		 Does the fault occur only within approx. 15 to 120 minutes after the engine is stopped? Go to step 44. 
  • When the fault occurs in two or three minutes or a long time after the engine is stopped: Go to step 43. 
  • When the fault occurrence pattern is inconsistent: Go to step 94. 
43 CHECK FUEL PRESSURE. 
WARNING: Place "NO OPEN FLAMES" signs near the working area.
CAUTION: Be careful not to spill fuel.
Measure the fuel pressure five minutes after the engine is stopped. Ref. to INSPECTION , Fuel Pressure.
CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
NOTE: If the engine does not start, measure the fuel pressure five minutes after cranking is completed.
 Is the measured value 147 kPa (1.5 kgf/cm2, 21 psi) or more? Go to step 93.  Replace the pressure regulator.
Ref. to FUEL FILTER
44 CHECK FUEL INJECTOR. 
  1. After the engine is stopped, scavenge inside of the intake manifold by applying compressed air.
  2. Measure the HC concentration inside the intake manifold 15 minutes after scavenging is completed.
NOTE:
  • Perform measurement using HC concentration gauge. If HC concentration gauge is not available, go to the next step.
  • For measuring HC concentration, remove the hose between intake manifold and purge control solenoid valve to measure the HC concentration in the intake manifold.
 Is the HC concentration less than 4, 000 ppm? Go to step 93.  Replace the fuel injector. Ref. to FUEL INJECTOR
45 CHECK SPARK PLUG. 
Check the spark plug. Ref. to INSPECTION , Spark Plug.		 Is the check result OK? Go to step 46.  Replace all spark plugs on all cylinders. Ref. to SPARK PLUG
46 CHECK CURRENT DATA. 
Record the value of «Engine Speed» during cranking using Subaru Select Monitor.
NOTE: For detailed operation procedures, refer to "Current Data Display For Engine". Ref. to DISPLAY CURRENT ENGINE DATA , OPERATION, Subaru Select Monitor.
 Does the recorded value of «Engine Speed» contain data of 0 rpm? It is possible that temporary fault occurs in the crankshaft position sensor circuit. Check the crankshaft position sensor circuit. Ref. to DTC P0335 CRANKSHAFT POSITION SENSOR "A" CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). Go to step 47. 
47 CHECK IGNITION COIL POWER SUPPLY CIRCUIT. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ignition coil.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between ignition coil connector and engine ground.

Connector & terminal 
(E31) No. 3 (+) - Engine ground (-): 
(E32) No. 3 (+) - Engine ground (-): 
(E33) No. 3 (+) - Engine ground (-): 
(E34) No. 3 (+) - Engine ground (-): 
(E45) No. 3 (+) - Engine ground (-): 
(E46) No. 3 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 48.  Repair the harness and connector.
NOTE: In this case, repair the following item:
  • Open or short to ground in power supply circuit
  • Poor contact of coupling connector
  • Blown out of fuse
48 CHECK HARNESS BETWEEN ECM AND IGNITION COIL CONNECTOR. 
  1. Disconnect the connector from ECM.
  2. Measure the resistance of harness between ECM connector and ignition coil connector.

Connector & terminal 
(E158) No. 37 - (E31) No. 1: 
(E158) No. 35 - (E32) No. 1: 
(E158) No. 38 - (E33) No. 1: 
(E158) No. 36 - (E34) No. 1: 
(E158) No. 26 - (E45) No. 1: 
(E158) No. 39 - (E4) No. 1: 		 Is the resistance less than 1 Ω? Go to step 49.  Repair the open circuit in harness between ECM connector and ignition coil connector.
49 CHECK HARNESS BETWEEN ECM AND IGNITION COIL CONNECTOR. 
Measure the resistance of harness between ECM connector and engine ground.
Connector & terminal 
(E158) No. 37 - Engine ground: 
(E158) No. 35 - Engine ground: 
(E158) No. 38 - Engine ground: 
(E158) No. 36 - Engine ground: 
(E158) No. 26 - Engine ground: 
(E158) No. 39 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 50.  Repair the ground short circuit of harness between ECM connector and ignition coil connector.
50 CHECK HARNESS OF IGNITION COIL GROUND CIRCUIT. 
  1. Turn the ignition switch to OFF.
  2. Measure the resistance of harness between ignition coil connector and engine ground.

Connector & terminal 
(E31) No. 2 - Engine ground: 
(E32) No. 2 - Engine ground: 
(E33) No. 2 - Engine ground: 
(E34) No. 2 - Engine ground: 
(E45) No. 2 - Engine ground: 
(E46) No. 2 - Engine ground: 		 Is the resistance less than 5 Ω? Replace the ignition coil. Ref. to IGNITION COIL . If the fault occurs after servicing, continue the diagnosis. Go to step 99.  Repair the open circuit in harness between ignition coil connector and engine grounding terminal.
51 CHECK OF FUEL PUMP. 
  1. On the "Active Test" item, select «Fuel Pump Control (ON/OFF Dr.)» and perform ON/OFF switching.
    NOTE: For detailed operation procedures, refer to the "Active Test". Ref. to ACTIVE TEST .
  2. Check if operating sound occurs in the fuel pump according to ON/OFF switching operation.
 Does the fuel pump emit operating sound? Check the fuel pump and fuel delivery line. Ref. to INSPECTION , Fuel Pump. Ref. to INSPECTION , Fuel Delivery and Evaporation Lines. Go to step 52. 
52 CHECK OF FUEL PUMP. 
Check fuel pump. Ref. to INSPECTION , Fuel Pump.		 Is the check result OK? Check fuel pump system. Ref. to DTC P0230 FUEL PUMP PRIMARY CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). If the fault occurs after servicing, continue the diagnosis. Go to step 95.  Replace the fuel pump. Ref. to FUEL PUMP
53 CHECK CURRENT DATA. 
Record the value of «Engine Speed» during cranking using Subaru Select Monitor.
NOTE: For detailed operation procedures, refer to "Current Data Display For Engine". Ref. to DISPLAY CURRENT ENGINE DATA , OPERATION, Subaru Select Monitor.
 Does the recorded value of «Engine Speed» contain data of 0 rpm? It is possible that temporary fault occurs in the crankshaft position sensor circuit. Check the crankshaft position sensor circuit. Ref. to DTC P0335 CRANKSHAFT POSITION SENSOR "A" CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). Go to step 54. 
54 CHECK POWER SUPPLY CIRCUIT OF FUEL INJECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from fuel injector.
  3. Turn the ignition switch to ON.
  4. Measure the voltage in harness between fuel injector connector and engine ground.

Connector & terminal 
#1 (E5) No. 1 (+) - Engine ground (-): 
#2 (E16) No. 1 (+) - Engine ground (-): 
#3 (E6) No. 1 (+) - Engine ground (-): 
#4 (E17) No. 1 (+) - Engine ground (-): 
#5 (E43) No. 1 (+) - Engine ground (-): 
#6 (E44) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 55.  Repair the power supply circuit.
55 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Disconnect the connector from fuel injector.
  4. Measure the resistance of harness between ECM connector and fuel injector connector.

Connector & terminal 
#1 (E158) No. 23 - (E5) No. 2: 
#2 (E158) No. 8 - (E16) No. 2: 
#3 (E158) No. 9 - (E6) No. 2: 
#4 (E158) No. 22 - (E17) No. 2: 
#5 (E158) No. 52 - (E43) No. 2: 
#6 (E158) No. 13 - (E43) No. 2: 		 Is the resistance less than 1 Ω? Go to step 56.  Repair the open circuit of the harness between the ECM connector and fuel injector connector.
56 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR. 
Measure the resistance between the ECM connector and engine ground.
Connector & terminal 
#1 (E158) No. 23 - Engine ground: 
#2 (E158) No. 8 - Engine ground: 
#3 (E158) No. 9 - Engine ground: 
#4 (E158) No. 22 - Engine ground: 
#5 (E158) No. 52 - Engine ground: 
#6 (E158) No. 13 - Engine ground: 		 Is the resistance 1 MΩ or more? Replace the ECM. Ref. to ENGINE CONTROL MODULE (ECM) Repair the short circuit to ground in harness between ECM connector and fuel injector connector.
57 CHECK MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR. 
Check the mass air flow and intake air temperature sensor. Ref. to INSPECTION , Mass Air Flow and Intake Air Temperature Sensor.		 Is the check result OK? Go to step 58.  Go to step 78. 
58 CHECK AIR INTAKE SYSTEM. 
Check the installing condition of the air intake system.		 Are there holes, loose bolts or disconnection of hose on air intake system? Repair the air intake system.
Ref. to GENERAL DESCRIPTION		 Go to step 59. 
59 CHECK ELECTRONIC THROTTLE CONTROL. 
  1. Disconnect the connectors from electronic throttle control.
  2. Start the engine with the electronic throttle control connector disconnected.
 Does the engine start? Go to step 60.  Go to step 61. 
60 CHECK THROTTLE BODY. 
Check throttle body. Ref. to INSPECTION , Throttle Body.		 Is there any deposit in the throttle body? Replace the throttle body. Ref. to THROTTLE BODY Go to step 61. 
61 CHECK FREEZE FRAME DATA. 
  1. Using the Subaru Select Monitor, read the values of the followings: «VVT Adv. Ang. Amount R», «VVT Advance Target Angle Amount R», «VVT Adv. Ang. Amount L», «VVT Advance Target Angle Amount L», «Exh. VVT Retard Ang. R», «Ex VVT Retard Target Angle R», «Exh. VVT Retard Ang. L» and «Ex VVT Retard Target Angle L».
    NOTE: For detailed operation procedures, refer to "Freeze Frame Data Display For Engine". Ref. to DISPLAY OF ENGINE FREEZE FRAME DATA , OPERATION, Subaru Select Monitor.
  2. Using the Subaru Select Monitor, compare the respective values between the followings: «VVT Adv. Ang. Amount R» and «VVT Advance Target Angle Amount R», «VVT Adv. Ang. Amount L» and «VVT Advance Target Angle Amount L», «Exh. VVT Retard Ang. R» and «Ex VVT Retard Target Angle R», «Exh. VVT Retard Ang. L» and «Ex VVT Retard Target Angle L».
 Does all of the advance angle amount and retard angle amount synchronize with their target values? Go to step 112.  Diagnose the part where there is difference of 10 deg or more.
  • Intake RH: Go to step 62. 
  • Intake LH: Go to step 66. 
  • Exhaust RH: Go to step 70. 
  • Exhaust LH: Go to step 74. 
62 CHECK POWER SUPPLY TO THE INTAKE OIL FLOW CONTROL SOLENOID RH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the intake oil flow control solenoid RH.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between intake oil flow control solenoid RH connector and engine ground.

Connector & terminal 
(E38) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 63.  Repair the power supply circuit.
63 CHECK HARNESS BETWEEN ECM AND INTAKE OIL FLOW CONTROL SOLENOID RH CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance of harness between ECM connector and intake oil flow control solenoid RH.

Connector & terminal 
(E158) No. 20 - (E38) No. 2: 		 Is the resistance less than 1 Ω? Go to step 64.  Repair the open circuit in harness between ECM connector and intake oil flow control solenoid RH connector.
64 CHECK HARNESS BETWEEN ECM AND INTAKE OIL FLOW CONTROL SOLENOID RH CONNECTOR. 
Measure the resistance between intake oil flow control solenoid RH connector and engine ground.
Connector & terminal 
(E38) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 65.  Repair the short circuit to ground in harness between ECM connector and intake oil flow control solenoid RH connector.
65 CHECK INTAKE OIL FLOW CONTROL SOLENOID RH. 
Check the intake oil flow control solenoid RH.
Ref. to OIL FLOW CONTROL SOLENOID VALVE		 Is the check result OK? Replace the intake cam sprocket RH.
Ref. to CAM SPROCKET		 Replace the intake oil flow control solenoid RH. Ref. to OIL FLOW CONTROL SOLENOID VALVE
66 CHECK POWER SUPPLY TO THE INTAKE OIL FLOW CONTROL SOLENOID LH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the intake oil flow control solenoid LH.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between intake oil flow control solenoid LH connector and engine ground.

Connector & terminal 
(E37) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 67.  Repair the power supply circuit.
67 CHECK HARNESS BETWEEN ECM AND INTAKE OIL FLOW CONTROL SOLENOID LH CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance of harness between ECM connector and intake oil flow control solenoid LH.

Connector & terminal 
(E158) No. 6 - (E37) No. 2: 		 Is the resistance less than 1 Ω? Go to step 68.  Repair the open circuit in harness between ECM connector and intake oil flow control solenoid LH connector.
68 CHECK HARNESS BETWEEN ECM AND INTAKE OIL FLOW CONTROL SOLENOID LH CONNECTOR. 
Measure the resistance between intake oil flow control solenoid LH connector and engine ground.
Connector & terminal 
(E37) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 69.  Repair the short circuit to ground in harness between ECM connector and intake oil flow control solenoid LH connector.
69 CHECK INTAKE OIL FLOW CONTROL SOLENOID LH. 
Check the intake oil flow control solenoid LH.
Ref. to INSTALLATION , Oil Flow Control Solenoid Valve.		 Is the check result OK? Replace the intake cam sprocket LH.
Ref. to CAM SPROCKET		 Replace the intake oil flow control solenoid LH. Ref. to INTAKE SIDE , REMOVAL, Oil Flow Control Solenoid Valve.
70 CHECK POWER SUPPLY TO THE EXHAUST OIL FLOW CONTROL SOLENOID RH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the exhaust oil flow control solenoid RH.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between exhaust oil flow control solenoid RH connector and engine ground.

Connector & terminal 
(E63) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 71.  Repair the power supply circuit.
71 CHECK HARNESS BETWEEN ECM AND EXHAUST OIL FLOW CONTROL SOLENOID RH CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance of harness between ECM connector and exhaust oil flow control solenoid RH.

Connector & terminal 
(E158) No. 21 - (E63) No. 2: 		 Is the resistance less than 1 Ω? Go to step 72.  Repair the open circuit in harness between ECM connector and exhaust oil flow control solenoid RH connector.
72 CHECK HARNESS BETWEEN ECM AND EXHAUST OIL FLOW CONTROL SOLENOID RH CONNECTOR. 
Measure the resistance between exhaust oil flow control solenoid RH connector and engine ground.
Connector & terminal 
(E63) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 73.  Repair the short circuit to ground in harness between ECM connector and exhaust oil flow control solenoid RH connector.
73 CHECK EXHAUST OIL FLOW CONTROL SOLENOID RH. 
Check the exhaust oil flow control solenoid RH.
Ref. to OIL FLOW CONTROL SOLENOID VALVE		 Is the check result OK? Replace the exhaust cam sprocket RH. Ref. to CAM SPROCKET Replace the exhaust oil flow control solenoid RH. Ref. to EXHAUST SIDE , REMOVAL, Oil Flow Control Solenoid Valve.
74 CHECK POWER SUPPLY TO THE EXHAUST OIL FLOW CONTROL SOLENOID LH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the exhaust oil flow control solenoid LH.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between exhaust oil flow control solenoid LH connector and engine ground.

Connector & terminal 
(E66) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 75.  Repair the power supply circuit.
75 CHECK HARNESS BETWEEN ECM AND EXHAUST OIL FLOW CONTROL SOLENOID LH CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance of harness between ECM connector and exhaust oil flow control solenoid LH.

Connector & terminal 
(E158) No. 7 - (E66) No. 2: 		 Is the resistance less than 1 Ω? Go to step 76.  Repair the open circuit in harness between ECM connector and exhaust oil flow control solenoid LH connector.
76 CHECK HARNESS BETWEEN ECM AND EXHAUST OIL FLOW CONTROL SOLENOID LH CONNECTOR. 
Measure the resistance between exhaust oil flow control solenoid LH connector and engine ground.
Connector & terminal 
(E66) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 77.  Repair the short circuit to ground in harness between ECM connector and exhaust oil flow control solenoid LH connector.
77 CHECK EXHAUST OIL FLOW CONTROL SOLENOID LH. 
Check the exhaust oil flow control solenoid LH.
Ref. to OIL FLOW CONTROL SOLENOID VALVE		 Is the check result OK? Replace the exhaust cam sprocket LH. Ref. to CAM SPROCKET Replace the exhaust oil flow control solenoid LH. Ref. to EXHAUST SIDE , REMOVAL, Oil Flow Control Solenoid Valve.
78 CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Disconnect the connectors from the mass air flow and intake air temperature sensor.
  4. Measure the resistance of harness between ECM connector and the mass air flow and intake air temperature sensor connector.

Connector & terminal 
(B134) No. 15 - (B3) No. 1: 
(B134) No. 16 - (B3) No. 5: 		 Is the resistance less than 1 Ω? Go to step 79.  Repair the open circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.
79 CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR. 
Measure the resistance between the ECM connector and engine ground.
Connector & terminal 
(B134) No. 15 - Engine ground: 
(B134) No. 16 - Engine ground: 		 Is the resistance 1 MΩ or more? Replace the mass air flow and intake air temperature sensor. Ref. to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . If the fault occurs after servicing, continue the diagnosis. Go to step 112.  Repair the ground short circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.
80 CHECK ENGINE COOLANT TEMPERATURE SENSOR. 
Check the engine coolant temperature sensor.
Ref. to INSPECTION , Engine Coolant Temperature Sensor.		 Is the check result OK? Go to step 81.  Replace the engine coolant temperature sensor. Ref. to ENGINE COOLANT TEMPERATURE SENSOR . If the fault occurs after servicing, replace the ECM. Ref. to ENGINE CONTROL MODULE (ECM) . If the fault still occurs after replacing the ECM, continue the diagnosis. Go to step 124. 
81 CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Disconnect the connectors from the engine coolant temperature sensor.
  4. Measure the resistance of harness between ECM connector and engine coolant temperature sensor connector.

Connector & terminal 
(E158) No. 34 - (E8) No. 1: 
(E158) No. 43 - (E8) No. 2: 		 Is the resistance less than 1 Ω? Go to step 82.  Repair the open circuit of the harness between the ECM connector and engine coolant temperature sensor connector. If the fault occurs after servicing, replace the ECM. Ref. to ENGINE CONTROL MODULE (ECM) . If the fault still occurs after replacing the ECM, continue the diagnosis. Go to step 124. 
82 CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR. 
Measure the resistance between the ECM connector and engine ground.
Connector & terminal 
(E158) No. 34 - Engine ground: 
(E158) No. 43 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 83.  Repair the short circuit to ground in harness between ECM connector and engine coolant temperature sensor connector. If the fault occurs after servicing, replace the ECM. Ref. to ENGINE CONTROL MODULE (ECM) . If the fault still occurs after replacing the ECM, continue the diagnosis. Go to step 124. 
83 CHECK CURRENT DATA. 
  1. Turn the ignition switch to ON. (Engine OFF)
  2. Read the values of «Long term fuel trim B1» and «Atmosphere Pressure», using the Subaru Select Monitor.
NOTE: For detailed operation procedures, refer to "Current Data Display For Engine". Ref. to DISPLAY CURRENT ENGINE DATA , OPERATION, Subaru Select Monitor.
 Is the value of «Long term fuel trim B1» -25 - 25%, and «Atmosphere Pressure» 80 kPa (600 mmHg, 23.6 inHg) or more? Go to step 86.  Go to step 84. 
84 CHECK FOR MALFUNCTION OCCURRENCE. 
  1. Perform the Clear Memory Mode. Ref. to CLEAR MEMORY MODE .
  2. Start the engine.
 Does the engine start? Go to step 85.  Go to step 86. 
85 CHECK IDLE SPEED. 
Check the idle speed.		 Is the idle speed stable? Replace the mass air flow and intake air temperature sensor. Ref. to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . If the fault occurs after servicing, replace the ECM. Ref. to ENGINE CONTROL MODULE (ECM) . If the fault still occurs after replacing the ECM, continue the diagnosis. Go to step 124.  Replace the fuel injector. Ref. to FUEL INJECTOR . If the fault occurs after servicing, replace the ECM. Ref. to ENGINE CONTROL MODULE (ECM) . If the fault still occurs after replacing the ECM, continue the diagnosis. Go to step 124. 
86 CHECK FUEL PRESSURE. 
WARNING: Place "NO OPEN FLAMES" signs near the working area.
CAUTION: Be careful not to spill fuel.
Measure the fuel pressure. Ref. to INSPECTION , Fuel Pressure.
CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
 Is the measured value 340 - 400 kPa (3.5 - 4.1 kgf/cm2, 49 - 58 psi)? Go to step 87.  Go to step 92. 
87 CHECK SPARK PLUG. 
Check the spark plug. Ref. to INSPECTION , Spark Plug.		 Is the check result OK? Go to step 88. 
  • When spark plugs in some cylinders are faulty: Replace the faulty spark plugs of the cylinders, then check the ignition system and fuel system in the faulty cylinders. Ref. to SPARK PLUG . If the fault occurs after servicing, continue the diagnosis. Go to step 124. 
  • When all spark plugs in all cylinders are faulty: Replace faulty spark plugs in all cylinders. Ref. to SPARK PLUG . If the fault occurs after servicing, continue the diagnosis. Go to step 124. 
88 CHECK FOR MALFUNCTION OCCURRENCE. 
Check for the condition of fault occurrence.		 Does the fault occur only within approx. 15 to 120 minutes after the engine is stopped? Go to step 90. 
  • When the fault occurs in two or three minutes or a long time after the engine is stopped: Go to step 89. 
  • When the fault occurrence pattern is inconsistent: Go to step 124. 
89 CHECK FUEL PRESSURE. 
WARNING: Place "NO OPEN FLAMES" signs near the working area.
CAUTION: Be careful not to spill fuel.
Measure the fuel pressure five minutes after the engine is stopped. Ref. to INSPECTION , Fuel Pressure.
CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
NOTE: If the engine does not start, measure the fuel pressure five minutes after cranking is completed.
 Is the measured value 147 kPa (1.5 kgf/cm2, 21 psi) or more? Go to step 124.  Replace the pressure regulator.
Ref. to FUEL FILTER
90 CHECK PURGE CONTROL SOLENOID VALVE. 
Check purge control solenoid valve 1 and purge control solenoid valve 2. Ref. to INSPECTION , Purge Control Solenoid Valve.		 Is the check result OK? Go to step 91.  Replace the faulty purge control solenoid valve. Ref. to PURGE CONTROL SOLENOID VALVE
91 CHECK FUEL INJECTOR. 
  1. After the engine is stopped, scavenge inside of the intake manifold by applying compressed air.
  2. Measure the HC concentration inside the intake manifold 15 minutes after scavenging is completed.
NOTE:
  • Perform measurement using HC concentration gauge. If HC concentration gauge is not available, go to the next step.
  • For measuring HC concentration, remove the hose between intake manifold and purge control solenoid valve to measure the HC concentration in the intake manifold.
 Is the HC concentration less than 4, 000 ppm? Go to step 125.  Replace the fuel injector. Ref. to FUEL INJECTOR
92 CHECK OF FUEL PUMP. 
Check fuel pump. Ref. to INSPECTION , Fuel Pump.		 Is the check result OK? Check fuel pump system. Ref. to DTC P0230 FUEL PUMP PRIMARY CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). If the fault occurs after servicing, continue the diagnosis. Go to step 124.  Replace the fuel pump. Ref. to FUEL PUMP
93 CHECK POWER SUPPLY CIRCUIT OF FUEL INJECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from fuel injector.
  3. Turn the ignition switch to ON.
  4. Measure the voltage in harness between fuel injector connector and engine ground.

Connector & terminal 
#1 (E5) No. 1 (+) - Engine ground (-): 
#2 (E16) No. 1 (+) - Engine ground (-): 
#3 (E6) No. 1 (+) - Engine ground (-): 
#4 (E17) No. 1 (+) - Engine ground (-): 
#5 (E43) No. 1 (+) - Engine ground (-): 
#6 (E44) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 94.  Repair the power supply circuit.
94 CHECK FUEL INJECTOR. 
Check fuel injector. Ref. to INSPECTION , Fuel Injector.		 Is the check result OK? Go to step 95.  Replace the fuel injector. Ref. to FUEL INJECTOR
95 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Disconnect the connector from fuel injector.
  4. Measure the resistance of harness between ECM connector and fuel injector connector.

Connector & terminal 
#1 (E158) No. 23 - (E5) No. 2: 
#2 (E158) No. 8 - (E16) No. 2: 
#3 (E158) No. 9 - (E6) No. 2: 
#4 (E158) No. 22 - (E17) No. 2: 
#5 (E158) No. 52 - (E43) No. 2: 
#6 (E158) No. 13 - (E44) No. 2: 		 Is the resistance less than 1 Ω? Go to step 96.  Repair the open circuit of the harness between the ECM connector and fuel injector connector.
96 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR. 
Measure the resistance between the ECM connector and engine ground.
Connector & terminal 
#1 (E158) No. 23 - Engine ground: 
#2 (E158) No. 8 - Engine ground: 
#3 (E158) No. 9 - Engine ground: 
#4 (E158) No. 22 - Engine ground: 
#5 (E158) No. 52 - Engine ground: 
#6 (E158) No. 13 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 97.  Repair the short circuit to ground in harness between ECM connector and fuel injector connector.
97 CHECK FOR MALFUNCTION OCCURRENCE. 
  1. Replace the crankshaft position sensor.

    Ref. to CRANKSHAFT POSITION SENSOR

  2. Check that the fault is removed.
 Is the fault removed? Perform the Clear Memory Mode to complete. Ref. to CLEAR MEMORY MODE Go to step 98. 
98 CHECK FOR MALFUNCTION OCCURRENCE. 
  1. Replace the camshaft position sensor.

    Ref. to CAMSHAFT POSITION SENSOR

  2. Check that the fault is removed.
 Is the fault removed? Perform the Clear Memory Mode to complete. Ref. to CLEAR MEMORY MODE . Replace the ECM. Ref. to ENGINE CONTROL MODULE (ECM) .
99 CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR.  Is the crankshaft position sensor installed correctly? Go to step 100.  Install the crankshaft position sensor correctly. Ref. to INSTALLATION , Crankshaft Position Sensor.
100 CHECK INSTALLATION CONDITION OF CAMSHAFT POSITION SENSOR.  Is the camshaft position sensor installed correctly? Go to step 101.  Install the camshaft position sensor correctly. Ref. to INSTALLATION , Camshaft Position Sensor.
101 CHECK POWER SUPPLY TO CRANKSHAFT POSITION SENSOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the crankshaft position sensor.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between crankshaft position sensor connector and engine ground.

Connector & terminal 
(E10) No. 1 (+) - Engine ground (-): 		 Is the voltage 5 V or more? Go to step 102.  Repair the power supply circuit.
102 CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance of harness between ECM connector and crankshaft position sensor connector.

Connector & terminal 
(E158) No. 40 - (E10) No. 1: 
(E158) No. 27 - (E10) No. 2: 		 Is the resistance less than 1 Ω? Go to step 103.  Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.
103 CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR. 
Measure the resistance between crankshaft position sensor connector and engine ground.
Connector & terminal 
(E10) No. 1 - Engine ground: 
(E10) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 104.  Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.
104 CHECK POWER SUPPLY OF INTAKE CAMSHAFT POSITION SENSOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the intake camshaft position sensor.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between intake camshaft position sensor connector and engine ground.

Connector & terminal 
(E35) No. 1 (+) - Engine ground (-): 
(E36) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 105.  Repair the open circuit or ground short circuit of harness between main relay connector and intake camshaft position sensor connector.
105 CHECK HARNESS BETWEEN ECM AND INTAKE CAMSHAFT POSITION SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance between ECM connector and intake camshaft position sensor connector.

Connector & terminal 
(E158) No. 41 - (E35) No. 2: 
(E158) No. 42 - (E35) No. 3: 
(E158) No. 54 - (E36) No. 2: 
(E158) No. 42 - (E36) No. 3: 		 Is the resistance less than 1 Ω? Go to step 106.  Repair the open circuit in the harness between ECM connector and intake camshaft position sensor connector.
106 CHECK HARNESS BETWEEN ECM AND INTAKE CAMSHAFT POSITION SENSOR CONNECTOR. 
Measure the resistance between intake camshaft position sensor connector and engine ground.
Connector & terminal 
(E35) No. 2 - Engine ground: 
(E36) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 107.  Repair short circuit to ground in the harness between ECM connector and intake camshaft position sensor connector.
107 CHECK POWER SUPPLY OF EXHAUST CAMSHAFT POSITION SENSOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the exhaust camshaft position sensor.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between exhaust camshaft position sensor connector and engine ground.

Connector & terminal 
(E62) No. 1 (+) - Engine ground (-): 
(E65) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 108.  Repair the open circuit in the harness between main relay and exhaust camshaft position sensor connector.
108 CHECK HARNESS BETWEEN ECM AND EXHAUST CAMSHAFT POSITION SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance between ECM connector and exhaust camshaft position sensor connector.

Connector & terminal 
(E158) No. 2 - (E62) No. 2: 
(E158) No. 42 - (E62) No. 3: 
(E158) No. 55 - (E65) No. 2: 
(E158) No. 42 - (E65) No. 3: 		 Is the resistance less than 1 Ω? Go to step 109.  Repair the open circuit in the harness between ECM connector and exhaust camshaft position sensor connector.
109 CHECK HARNESS BETWEEN ECM AND EXHAUST CAMSHAFT POSITION SENSOR CONNECTOR. 
Measure the resistance between exhaust camshaft position sensor connector and engine ground.
Connector & terminal 
(E62) No. 2 - Engine ground: 
(E65) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 110.  Repair short circuit to ground in the harness between ECM connector and exhaust camshaft position sensor connector.
110 CHECK FOR MALFUNCTION OCCURRENCE. 
  1. Replace the crankshaft position sensor.

    Ref. to CRANKSHAFT POSITION SENSOR .

  2. Check that the fault is removed.
 Is the fault removed? Perform the Clear Memory Mode to complete. Ref. to CLEAR MEMORY MODE Go to step 111. 
111 CHECK FOR MALFUNCTION OCCURRENCE. 
  1. Replace the camshaft position sensor.

    Ref. to CAMSHAFT POSITION SENSOR

  2. Check that the fault is removed.
 Is the fault removed? Perform the Clear Memory Mode to complete. Ref. to CLEAR MEMORY MODE Replace the ECM. Ref. to ENGINE CONTROL MODULE (ECM)
112 CHECK ENGINE COOLANT TEMPERATURE SENSOR. 
Check the engine coolant temperature sensor.
Ref. to INSPECTION , Engine Coolant Temperature Sensor.		 Is the check result OK? Go to step 113.  Replace the engine coolant temperature sensor. Ref. to ENGINE COOLANT TEMPERATURE SENSOR
113 CHECK FUEL PRESSURE. 
WARNING: Place "NO OPEN FLAMES" signs near the working area.
CAUTION: Be careful not to spill fuel.
Measure the fuel pressure. Ref. to INSPECTION , Fuel Pressure.
CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
 Is the measured value 340 - 400 kPa (3.5 - 4.1 kgf/cm2, 49 - 58 psi)? Go to step 114.  Go to step 115. 
114 CHECK FUEL PRESSURE. 
WARNING: Place "NO OPEN FLAMES" signs near the working area.
CAUTION: Be careful not to spill fuel.
Measure the fuel pressure five minutes after the engine is stopped. Ref. to INSPECTION , Fuel Pressure.
CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
 Is the fuel pressure 147 kPa (1.5 kgf/cm2, 21 psi) or more five minutes after engine stops? Go to step 115.  Go to step 123. 
115 CHECK CURRENT DATA. 
  1. Turn the ignition switch to ON. (Engine OFF)
  2. Read the value of «Long term fuel trim B1» using the Subaru Select Monitor.
    NOTE: For detailed operation procedures, refer to "Current Data Display For Engine". Ref. to DISPLAY CURRENT ENGINE DATA , OPERATION, Subaru Select Monitor.
 Does the value of «Long term fuel trim B1» fall within a range of -15 - 15%? Go to step 116.  Replace the fuel injector. Ref. to FUEL INJECTOR
116 CHECK FOR MALFUNCTION OCCURRENCE. 
Start the engine and check the idling speed.		 Is the idling speed stable all time? It is possible that the fault comes from fuel. Replace fuel. Go to step 117. 
117 CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR.  Is the crankshaft position sensor installed correctly? Go to step 118.  Install the crankshaft position sensor correctly. Ref. to INSTALLATION , Crankshaft Position Sensor.
118 CHECK POWER SUPPLY TO CRANKSHAFT POSITION SENSOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the crankshaft position sensor.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between crankshaft position sensor connector and engine ground.

Connector & terminal 
(E10) No. 1 (+) - Engine ground (-): 		 Is the voltage 5 V or more? Go to step 119.  Repair the power supply circuit.
119 CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance of harness between ECM connector and crankshaft position sensor connector.

Connector & terminal 
(E158) No. 40 - (E10) No. 1: 
(E158) No. 27 - (E10) No. 2: 		 Is the resistance less than 1 Ω? Go to step 120.  Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.
120 CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR. 
Measure the resistance between crankshaft position sensor connector and engine ground.
Connector & terminal 
(E10) No. 1 - Engine ground: 
(E10) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 121.  Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.
121 CHECK COMPRESSION PRESSURE. 
Check the compression pressure. Ref. to INSPECTION , Compression.		 Is the check result OK? Go to step 122.  Check the engine. Ref. to INSPECTION , Engine Trouble in General.
122 CHECK FOR MALFUNCTION OCCURRENCE. 
  1. Replace the crankshaft position sensor.

    Ref. to CRANKSHAFT POSITION SENSOR

  2. Check that the fault is removed.
 Is the fault removed? Perform the Clear Memory Mode to complete. Ref. to CLEAR MEMORY MODE Check the valve timing. Ref. to TIMING CHAIN ASSEMBLY . When the valve timing is normal, replace the ECM. Ref. to ENGINE CONTROL MODULE (ECM)
123 CHECK OF FUEL PUMP. 
Check fuel pump. Ref. to INSPECTION , Fuel Pump.		 Is the check result OK? Check fuel pump system. Ref. to DTC P0230 FUEL PUMP PRIMARY CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). Replace the fuel pump. Ref. to FUEL PUMP
124 CHECK FUEL PRESSURE. 
WARNING: Place "NO OPEN FLAMES" signs near the working area.
CAUTION: Be careful not to spill fuel.
Measure the fuel pressure. Ref. to INSPECTION , Fuel Pressure.
CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
 Is the measured value 340 - 400 kPa (3.5 - 4.1 kgf/cm2, 49 - 58 psi)? Go to step 125.  Go to step 126. 
125 CHECK FUEL PRESSURE. 
WARNING: Place "NO OPEN FLAMES" signs near the working area.
CAUTION: Be careful not to spill fuel.
Measure the fuel pressure five minutes after the engine is stopped. Ref. to INSPECTION , Fuel Pressure.
CAUTION: Before attaching/detaching a fuel pressure gauge, release the fuel pressure.
 Is the fuel pressure 147 kPa (1.5 kgf/cm2, 21 psi) or more five minutes after engine stops? Go to step 126.  Go to step 133. 
126 CHECK CURRENT DATA. 
  1. Turn the ignition switch to ON. (Engine OFF)
  2. Read the value of «Long term fuel trim B1» using the Subaru Select Monitor.
NOTE: For detailed operation procedures, refer to "Current Data Display For Engine". Ref. to DISPLAY CURRENT ENGINE DATA , OPERATION, Subaru Select Monitor.
 Does the value of «Long term fuel trim B1» fall within a range of -15 - 15%? Go to step 127.  Replace the fuel injector. Ref. to FUEL INJECTOR
127 CHECK FOR MALFUNCTION OCCURRENCE. 
Start the engine and check the idling speed.		 Is the idling speed stable all time? It is possible that the fault comes from fuel. Replace fuel. Go to step 128. 
128 CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR.  Is the crankshaft position sensor installed correctly? Go to step 129.  Install the crankshaft position sensor correctly. Ref. to INSTALLATION , Crankshaft Position Sensor.
129 CHECK POWER SUPPLY TO CRANKSHAFT POSITION SENSOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the crankshaft position sensor.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between crankshaft position sensor connector and engine ground.

Connector & terminal 
(E10) No. 1 (+) - Engine ground (-): 		 Is the voltage 5 V or more? Go to step 130.  Repair the power supply circuit.
130 CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance of harness between ECM connector and crankshaft position sensor connector.

Connector & terminal 
(E158) No. 40 - (E10) No. 1: 
(E158) No. 27 - (E10) No. 2: 		 Is the resistance less than 1 Ω? Go to step 131.  Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.
131 CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR. 
Measure the resistance between crankshaft position sensor connector and engine ground.
Connector & terminal 
(E10) No. 1 - Engine ground: 
(E10) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 132.  Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.
132 CHECK FOR MALFUNCTION OCCURRENCE. 
  1. Replace the crankshaft position sensor.

    Ref. to CRANKSHAFT POSITION SENSOR

  2. Check that the fault is removed.
 Is the fault removed? Perform the Clear Memory Mode to complete. Ref. to CLEAR MEMORY MODE Replace the ECM. Ref. to ENGINE CONTROL MODULE (ECM)
133 CHECK OF FUEL PUMP. 
Check fuel pump. Ref. to INSPECTION , Fuel Pump.		 Is the check result OK? Go to step 134.  Replace the fuel pump. Ref. to FUEL PUMP
134 CHECK FUEL PUMP SYSTEM. 
Check fuel pump system. Ref. to DTC P0230 FUEL PUMP PRIMARY CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).		 Is the check result OK? Go to step 135.  Repair the fuel pump system.
Ref. to DTC P0230 FUEL PUMP PRIMARY CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).
135 CHECK PURGE CONTROL SOLENOID VALVE. 
Check purge control solenoid valve 1 and purge control solenoid valve 2. Ref. to INSPECTION , Purge Control Solenoid Valve.		 Is the check result OK? Go to step 136.  Replace the faulty purge control solenoid valve. Ref. to PURGE CONTROL SOLENOID VALVE
136 CHECK FUEL INJECTOR. 
  1. After the engine is stopped, scavenge inside of the intake manifold by applying compressed air.
  2. Measure the HC concentration inside the intake manifold 15 minutes after scavenging is completed.
NOTE:
  • Perform measurement using HC concentration gauge. If HC concentration gauge is not available, go to the next step.
  • For measuring HC concentration, remove the hose between intake manifold and purge control solenoid valve to measure the HC concentration in the intake manifold.
 Is the HC concentration less than 4, 000 ppm? Go to step 137.  Replace the fuel injector. Ref. to FUEL INJECTOR
137 CHECK INTAKE VALVE. 
Check the intake valve. Ref. to INSPECTION , Cylinder Head.		 Is there any deposit in the intake valve? Clean the intake valve. Ref. to CYLINDER HEAD Go to step 138. 
138 CHECK ENGINE COOLANT TEMPERATURE SENSOR. 
Check the engine coolant temperature sensor. Ref. to INSPECTION , Engine Coolant Temperature Sensor.		 Is the check result OK? Go to step 139.  Replace the engine coolant temperature sensor. Ref. to ENGINE COOLANT TEMPERATURE SENSOR
139 CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR.  Is the crankshaft position sensor installed correctly? Go to step 140.  Install the crankshaft position sensor correctly. Ref. to INSTALLATION , Crankshaft Position Sensor.
140 CHECK INSTALLATION CONDITION OF CAMSHAFT POSITION SENSOR.  Is the camshaft position sensor installed correctly? Go to step 141.  Install the camshaft position sensor correctly. Ref. to INSTALLATION , Camshaft Position Sensor.
141 CHECK POWER SUPPLY TO CRANKSHAFT POSITION SENSOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the crankshaft position sensor.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between crankshaft position sensor connector and engine ground.

Connector & terminal 
(E10) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 142.  Repair the power supply circuit.
142 CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance of harness between ECM connector and crankshaft position sensor connector.

Connector & terminal 
(E158) No. 40 - (E10) No. 1: 
(E158) No. 27 - (E10) No. 2: 		 Is the resistance less than 1 Ω? Go to step 143.  Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.
143 CHECK HARNESS BETWEEN ECM AND CRANKSHAFT POSITION SENSOR CONNECTOR. 
Measure the resistance between crankshaft position sensor connector and engine ground.
Connector & terminal 
(E10) No. 1 - Engine ground: 
(E10) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 144.  Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.
144 CHECK POWER SUPPLY OF INTAKE CAMSHAFT POSITION SENSOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the intake camshaft position sensor.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between intake camshaft position sensor connector and engine ground.

Connector & terminal 
(E35) No. 1 (+) - Engine ground (-): 
(E36) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 145.  Repair the open circuit or ground short circuit of harness between main relay connector and intake camshaft position sensor connector.
145 CHECK HARNESS BETWEEN ECM AND INTAKE CAMSHAFT POSITION SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance between ECM connector and intake camshaft position sensor connector.

Connector & terminal 
(E158) No. 41 - (E35) No. 2: 
(E158) No. 42 - (E35) No. 3: 
(E158) No. 54 - (E36) No. 2: 
(E158) No. 42 - (E36) No. 3: 		 Is the resistance less than 1 Ω? Go to step 146.  Repair the open circuit in the harness between ECM connector and intake camshaft position sensor connector.
146 CHECK HARNESS BETWEEN ECM AND INTAKE CAMSHAFT POSITION SENSOR CONNECTOR. 
Measure the resistance between intake camshaft position sensor connector and engine ground.
Connector & terminal 
(E35) No. 2 - Engine ground: 
(E36) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 147.  Repair short circuit to ground in the harness between ECM connector and intake camshaft position sensor connector.
147 CHECK POWER SUPPLY OF EXHAUST CAMSHAFT POSITION SENSOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the exhaust camshaft position sensor.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between exhaust camshaft position sensor connector and engine ground.

Connector & terminal 
(E62) No. 1 (+) - Engine ground (-): 
(E65) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 148.  Repair the open circuit in the harness between main relay and exhaust camshaft position sensor connector.
148 CHECK HARNESS BETWEEN ECM AND EXHAUST CAMSHAFT POSITION SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance between ECM connector and exhaust camshaft position sensor connector.

Connector & terminal 
(E158) No. 2 - (E62) No. 2: 
(E158) No. 42 - (E62) No. 3: 
(E158) No. 55 - (E65) No. 2: 
(E158) No. 42 - (E65) No. 3: 		 Is the resistance less than 1 Ω? Go to step 149.  Repair the open circuit in the harness between ECM connector and exhaust camshaft position sensor connector.
149 CHECK HARNESS BETWEEN ECM AND EXHAUST CAMSHAFT POSITION SENSOR CONNECTOR. 
Measure the resistance between exhaust camshaft position sensor connector and engine ground.
Connector & terminal 
(E62) No. 2 - Engine ground: 
(E65) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 150.  Repair short circuit to ground in the harness between ECM connector and exhaust camshaft position sensor connector.
150 CHECK COMPRESSION PRESSURE. 
Check the compression pressure. Ref. to INSPECTION , Compression.		 Is the check result OK? Go to step 151.  Check the engine. Ref. to INSPECTION , Engine Trouble in General.
151 CHECK FOR MALFUNCTION OCCURRENCE. 
  1. Replace the crankshaft position sensor.

    Ref. to CRANKSHAFT POSITION SENSOR

  2. Check that the fault is removed.
 Is the fault removed? Perform the Clear Memory Mode to complete. Ref. to CLEAR MEMORY MODE Go to step 152. 
152 CHECK FOR MALFUNCTION OCCURRENCE. 
  1. Replace the camshaft position sensor.

    Ref. to CAMSHAFT POSITION SENSOR

  2. Check that the fault is removed.
 Is the fault removed? Perform the Clear Memory Mode to complete. Ref. to CLEAR MEMORY MODE Check the valve timing. Ref. to TIMING CHAIN ASSEMBLY . When the valve timing is normal, replace the ECM. Ref. to ENGINE CONTROL MODULE (ECM)
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