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Home >> Subaru >> 2017 >> Legacy 3.6R Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Engine Control System (Diagnostics) (P0700 To P2097) (H4DO)) >> 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: Crankshaft Position Sensor Circuit Diagram
G11583380Courtesy of SUBARU OF AMERICA, INC.
Fig 2: Fuel Injector Circuit Diagram
G11583292Courtesy of SUBARU OF AMERICA, INC.
Fig 3: Ignition Coil Circuit Diagram
G11583389Courtesy of SUBARU OF AMERICA, INC.
Fig 4: Intake Oil Control Solenoid Circuit Diagram
G11583293Courtesy of SUBARU OF AMERICA, INC.
Fig 5: Mass Air Flow Circuit Diagram
G11583310Courtesy of SUBARU OF AMERICA, INC.
Fig 6: Engine Coolant Temperature Sensor Circuit Diagram
G11583324Courtesy of SUBARU OF AMERICA, INC.
Fig 7: Intake Camshaft Position Sensor Circuit Diagram
G11583385Courtesy 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 28  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 18 
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.
  • ECM power voltage drops temporarily at cranking.
 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 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 13  Go to step 12 
12 CHECK OF FUEL PUMP. 
Check fuel pump. Ref. to INSPECTION , Fuel Pump.		 Is the check result OK? Check fuel pump system. Ref. to FUEL PUMP Replace the fuel pump. Ref. to FUEL PUMP
13 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 14 
14 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 15  Check the fuel pump and fuel delivery line. Ref. to INSPECTION , Fuel Pump. Ref. to INSPECTION , Fuel Delivery and Evaporation Lines.
15 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 between fuel injector connector and the engine ground.

Connector & terminal 
(E5) No. 2 (+) - Engine ground (-): 
(E16) No. 2 (+) - Engine ground (-): 
(E6) No. 2 (+) - Engine ground (-): 
(E17) No. 2 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 16  Repair the power supply circuit.
16 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. 1: 
#2 (E158) No. 8 - (E16) No. 1: 
#3 (E158) No. 9 - (E6) No. 1: 
#4 (E158) No. 22 - (E17) No. 1: 		 Is the resistance less than 1 Ω? Go to step 17  Repair the open circuit of the harness between the ECM connector and fuel injector connector.
17 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: 		 Is the resistance 1 MΩ or more? Go to step 27  Repair the short circuit to ground in harness between ECM connector and fuel injector connector.
18 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 19 
  • 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.
19 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 20 
20 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 21 
21 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. 3
 Is the value of «Coolant Temp.» 40 - 90°C (104 - 194°F)? Go to step 23  Go to step 22 
22 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 27  Replace the pressure regulator. Ref. to FUEL FILTER
23 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.
  • If HC concentration gauge is not available, go to the next step.
  • For measuring HC concentration, remove the vacuum hose between intake manifold assembly and purge control solenoid valve to measure the HC concentration in the intake manifold assembly.
 Is the HC concentration less than 4, 000 ppm? Go to step 25  Go to step 24 
24 CHECK FUEL INJECTOR. 
Check fuel injector. Ref. to INSPECTION , Fuel Injector.		 Is the check result OK? Go to step 25  Replace the fuel injector. Ref. to FUEL INJECTOR
25 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 26 
26 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 27 
27 CHECK FOR MALFUNCTION OCCURRENCE.  Is the fault removed? Perform the Clear Memory Mode to complete. Ref. to CLEAR MEMORY MODE Go to step 28 
28 CHECK FOR MALFUNCTION OCCURRENCE.  Does cranking occur?
  • When the engine speed is abnormal during cranking: Go to step 35 
  • When an initial combustion does not occur: Go to step 38 
  • When the engine stalls immediately after engine start: Go to step 56 
  • When the engine takes time to start: Go to step 70 
 Go to step 29 
29 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 30 
  • When the starter motor rotates but does not engage: Go to step 32 
 Go to step 33 
30 CHECK BATTERY. 
Check the battery. Ref. to INSPECTION , Battery.		 Is the check result OK? Go to step 31  Charge or replace the battery. Ref. to BATTERY
31 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.
32 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
33 CHECK BATTERY. 
Check the battery. Ref. to INSPECTION , Battery.		 Is the check result OK? Go to step 34  Charge or replace the battery. Ref. to BATTERY
34 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
35 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 36 
36 CHECK BATTERY. 
Check the battery. Ref. to INSPECTION , Battery.		 Is the check result OK? Go to step 37  Charge or replace the battery. Ref. to BATTERY
37 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.
38 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 39  Go to step 52 
39 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 40  Go to step 50 
40 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 41  Go to step 44 
41 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 43 
  • When the fault occurs in two or three minutes or a long time after the engine is stopped: Go to step 42 
  • When the fault occurrence pattern is inconsistent: Go to step 83 
42 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 83  Replace the pressure regulator. Ref. to FUEL FILTER
43 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:
  • If HC concentration gauge is not available, go to the next step.
  • For measuring HC concentration, remove the vacuum hose between intake manifold assembly and purge control solenoid valve to measure the HC concentration in the intake manifold assembly.
 Is the HC concentration less than 4, 000 ppm? Go to step 83  Replace the fuel injector. Ref. to FUEL INJECTOR
44 CHECK SPARK PLUG. 
Check the spark plug. Ref. to INSPECTION , Spark Plug.		 Is the check result OK? Go to step 45  Replace all spark plugs on all cylinders. Ref. to SPARK PLUG
45 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 46 
46 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. 1 (+) - Engine ground (-): 
(E32) No. 1 (+) - Engine ground (-): 
(E33) No. 1 (+) - Engine ground (-): 
(E34) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 47  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
47 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. 2: 
(E158) No. 35 - (E32) No. 2: 
(E158) No. 38 - (E33) No. 2: 
(E158) No. 36 - (E34) No. 2: 		 Is the resistance less than 1 Ω? Go to step 48  Repair the open circuit in harness between ECM connector and ignition coil connector.
48 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: 		 Is the resistance 1 MΩ or
more?		 Go to step 49  Repair the ground short circuit of harness between ECM connector and ignition coil connector.
49 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. 3 - Engine ground: 
(E32) No. 3 - Engine ground: 
(E33) No. 3 - Engine ground: 
(E34) No. 3 - 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 89  Repair the open circuit in harness between ignition coil connector and engine grounding terminal.
50 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 51 
51 CHECK OF FUEL PUMP. 
Check fuel pump. Ref. to INSPECTION , Fuel Pump.		 Is the check result OK? Check fuel pump system. Ref. to FUEL PUMP If the fault occurs after servicing, continue the diagnosis. Go to step 83  Replace the fuel pump. Ref. to FUEL PUMP
52 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 53 
53 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 between fuel injector connector and the engine ground.

Connector & terminal 
(E5) No. 2 (+) - Engine ground (-): 
(E16) No. 2 (+) - Engine ground (-): 
(E6) No. 2 (+) - Engine ground (-): 
(E17) No. 2 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 54  Repair the power supply circuit.
54 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. 1: 
#2 (E158) No. 8 - (E16) No. 1: 
#3 (E158) No. 9 - (E6) No. 1: 
#4 (E158) No. 22 - (E17) No. 1: 		 Is the resistance less than 1 Ω? Go to step 55  Repair the open circuit of the harness between the ECM connector and fuel injector connector.
55 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: 		 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.
56 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 57  Go to step 68 
57 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 58 
58 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 59 
59 CHECK FREEZE FRAME DATA. 
  1. Using Subaru Select Monitor, read the values of «VVT Adv. Ang. Amount R», «VVT Advance Target Angle Amount R» and «VVT Adv. Ang. Amount L» and «VVT Advance Target Angle Amount 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 Subaru Select Monitor, compare the respective values between the followings: «VVT Adv. Ang. Amount R», «VVT Advance Target Angle Amount R», «VVT Adv. Ang. Amount L» and «VVT Advance Target Angle Amount L».
 Does all of the advance angle amount and retard angle amount synchronize with their target values? Go to step 98  Diagnose the part where there is difference of 10 deg or more.
  • Intake RH: Go to step 60 
  • Intake LH: Go to step 64 
60 CHECK POWER SUPPLY TO THE INTAKE OIL CONTROL SOLENOID RH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the intake oil control solenoid RH.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between intake oil control solenoid RH connector and engine ground.

Connector & terminal 
(E38) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 61  Repair the power supply circuit.
61 CHECK HARNESS BETWEEN ECM AND INTAKE OIL 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 control solenoid RH.

    Connector & terminal 

    (E158) No. 20 - (E38) No. 2: 

 Is the resistance less than 1 Ω? Go to step 62  Repair the open circuit in harness between ECM connector and intake oil control solenoid RH connector.
62 CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID RH CONNECTOR. 
Measure the resistance between intake oil control solenoid RH connector and engine ground.
Connector & terminal 
(E38) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 63  Repair the short circuit to ground in harness between ECM connector and intake oil control solenoid RH connector.
63 CHECK INTAKE OIL CONTROL SOLENOID RH. 
Check the intake oil control solenoid RH. Ref. to INSPECTION , Oil Control Solenoid.		 Is the check result OK? Replace the intake cam sprocket RH. Ref. to CAM SPROCKET Replace the intake oil control solenoid RH. Ref. to OIL CONTROL SOLENOID
64 CHECK POWER SUPPLY TO THE INTAKE OIL CONTROL SOLENOID LH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the intake oil control solenoid LH.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between intake oil control solenoid LH connector and engine ground.

Connector & terminal 
(E37) No. 1 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 65  Repair the power supply circuit.
65 CHECK HARNESS BETWEEN ECM AND INTAKE OIL 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 control solenoid LH.

Connector & terminal 
(E158) No. 6 - (E37) No. 2: 		 Is the resistance less than 1 Ω? Go to step 66  Repair the open circuit in harness between ECM connector and intake oil control solenoid LH connector.
66 CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID LH CONNECTOR. 
Measure the resistance between intake oil control solenoid LH connector and engine ground.
Connector & terminal 
(E37) No. 2 - Engine ground: 		 Is the resistance 1 MΩ or more? Go to step 67  Repair the short circuit to ground in harness between ECM connector and intake oil control solenoid LH connector.
67 CHECK INTAKE OIL CONTROL SOLENOID LH. 
Check the intake oil control solenoid LH. Ref. to INSPECTION , Oil Control Solenoid.		 Is the check result OK? Replace the intake cam sprocket LH. Ref. to CAM SPROCKET Replace the intake oil control solenoid LH. Ref. to OIL CONTROL SOLENOID
68 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. 16 - (B3) No. 5: 
(B134) No. 17 - (B3) No. 4: 		 Is the resistance less than 1 Ω? Go to step 69  Repair the open circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.
69 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. 16 - Engine ground: 
(B134) No. 17 - 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 98  Repair the ground short circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.
70 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 71  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 109 
71 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 72  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 109 
72 CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR. 
Measure the resistance between the ECM connector and engine ground.
Connector & terminal 
(E158) No. 43 - Engine ground: 
(E158) No. 34 - 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 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 109 
73 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 76  Go to step 74 
74 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 75  Go to step 76 
75 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 109  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 109 
76 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 77  Go to step 82 
77 CHECK SPARK PLUG. 
Check the spark plug. Ref. to INSPECTION , Spark Plug.		 Is the check result OK? Go to step 78 
  • 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 109 
  • 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 109 
78 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 80 
  • When the fault occurs in two or three minutes or a long time after the engine is stopped: Go to step 79 
  • When the fault occurrence pattern is inconsistent: Go to step 109 
79 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 108  Replace the pressure regulator. Ref. to FUEL FILTER
80 CHECK PURGE CONTROL SOLENOID VALVE. 
Check the purge control solenoid valve. Ref. to INSPECTION , Purge Control Solenoid Valve.		 Is the check result OK? Go to step 81  Replace the faulty purge control solenoid valve. Ref. to PURGE CONTROL SOLENOID VALVE
81 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:
  • If HC concentration gauge is not available, go to the next step.
  • For measuring HC concentration, remove the vacuum hose between intake manifold assembly and purge control solenoid valve to measure the HC concentration in the intake manifold assembly.
 Is the HC concentration less than 4, 000 ppm? Go to step 109  Replace the fuel injector. Ref. to FUEL INJECTOR
82 CHECK OF FUEL PUMP. 
Check fuel pump. Ref. to INSPECTION , Fuel Pump.		 Is the check result OK? Check fuel pump system. Ref. to FUEL PUMP If the fault occurs after servicing, continue the diagnosis. Go to step 109  Replace the fuel pump. Ref. to FUEL PUMP
83 CHECK FUEL INJECTOR. 
Check fuel injector. Ref. to INSPECTION , Fuel Injector.		 Is the check result OK? Go to step 84  Replace the fuel injector. Ref. to FUEL INJECTOR
84 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 between fuel injector connector and the engine ground.

Connector & terminal 
(E5) No. 2 (+) - Engine ground (-): 
(E16) No. 2 (+) - Engine ground (-): 
(E6) No. 2 (+) - Engine ground (-): 
(E17) No. 2 (+) - Engine ground (-): 		 Is the voltage 10 V or more? Go to step 85  Repair the power supply circuit.
85 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. 1: 
#2 (E158) No. 8 - (E16) No. 1: 
#3 (E158) No. 9 - (E6) No. 1: 
#4 (E158) No. 22 - (E17) No. 1: 		 Is the resistance less than 1 Ω? Go to step 86  Repair the open circuit of the harness between the ECM connector and fuel injector connector.
86 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: 		 Is the resistance 1 MΩ or
more?		 Go to step 87  Repair the short circuit to ground in harness between ECM connector and fuel injector connector.
87 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 88 
88 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)
89 CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR.  Is the crankshaft position sensor installed correctly? Go to step 90  Install the crankshaft position sensor correctly. Ref. to INSTALLATION , Crankshaft Position Sensor.
90 CHECK INSTALLATION CONDITION OF CAMSHAFT POSITION SENSOR.  Is the camshaft position sensor installed correctly? Go to step 91  Install the camshaft position sensor correctly. Ref. to INSTALLATION , Camshaft Position Sensor.
91 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 92  Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.
92 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 93  Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.
93 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 94  Repair the harness and connector.
NOTE: In this case, repair the following item:
  • Open circuit or short circuit to ground in harness between main relay connector and intake camshaft position sensor connector
  • Poor contact of coupling connector
94 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 95  Repair the open circuit in the harness between ECM connector and intake camshaft position sensor connector.
95 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 96  Repair short circuit to ground in the harness between ECM connector and intake camshaft position sensor connector.
96 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 97 
97 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)
98 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 99  Replace the engine coolant temperature sensor. Ref. to ENGINE COOLANT TEMPERATURE SENSOR
99 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 100  Go to step 117 
100 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 101  Go to step 117 
101 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 102  Replace the fuel injector. Ref. to FUEL INJECTOR
102 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 103 
103 CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR.  Is the crankshaft position sensor installed correctly? Go to step 104  Install the crankshaft position sensor correctly. Ref. to INSTALLATION , Crankshaft Position Sensor.
104 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 105  Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.
105 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 106  Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.
106 CHECK COMPRESSION PRESSURE. 
Check the compression pressure. Ref. to INSPECTION , Compression.		 Is the check result OK? Go to step 107  Check the engine. Ref. to INSPECTION , Engine Trouble in General.
107 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)
108 CHECK OF FUEL PUMP. 
Check fuel pump. Ref. to INSPECTION , Fuel Pump.		 Is the check result OK? Check fuel pump circuit. Ref. to FUEL PUMP CIRCUIT , Diagnostics for Engine Starting Failure. Replace the fuel pump. Ref. to FUEL PUMP
109 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 110  Go to step 117 
110 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 111  Go to step 117 
111 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 112  Replace the fuel injector. Ref. to FUEL INJECTOR
112 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 113 
113 CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR.  Is the crankshaft position sensor installed correctly? Go to step 114  Install the crankshaft position sensor correctly. Ref. to INSTALLATION , Crankshaft Position Sensor.
114 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 115  Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.
115 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 116  Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.
116 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)
117 CHECK OF FUEL PUMP. 
Check fuel pump. Ref. to INSPECTION , Fuel Pump.		 Is the check result OK? Go to step 118  Replace the fuel pump. Ref. to FUEL PUMP
118 CHECK FUEL PUMP SYSTEM. 
Check fuel pump circuit. Ref. to FUEL PUMP CIRCUIT , Diagnostics for Engine Starting Failure.		 Is the check result OK? Go to step 119  Repair the fuel pump circuit. Ref. to FUEL PUMP CIRCUIT , Diagnostics for Engine Starting Failure.
119 CHECK PURGE CONTROL SOLENOID VALVE. 
Check the purge control solenoid valve. Ref. to INSPECTION , Purge Control Solenoid Valve.		 Is the check result OK? Go to step 120  Replace the faulty purge control solenoid valve. Ref. to PURGE CONTROL SOLENOID VALVE
120 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:
  • If HC concentration gauge is not available, go to the next step.
  • For measuring HC concentration, remove the vacuum hose between intake manifold assembly and purge control solenoid valve to measure the HC concentration in the intake manifold assembly.
 Is the HC concentration less than 4, 000 ppm? Go to step 121  Replace the fuel injector. Ref. to FUEL INJECTOR
121 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 122 
122 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 123  Replace the engine coolant temperature sensor. Ref. to ENGINE COOLANT TEMPERATURE SENSOR
123 CHECK INSTALLATION CONDITION OF CRANKSHAFT POSITION SENSOR.  Is the crankshaft position sensor installed correctly? Go to step 124  Install the crankshaft position sensor correctly. Ref. to INSTALLATION , Crankshaft Position Sensor.
124 CHECK INSTALLATION CONDITION OF CAMSHAFT POSITION SENSOR.  Is the camshaft position sensor installed correctly? Go to step 125  Install the camshaft position sensor correctly. Ref. to INSTALLATION , Camshaft Position Sensor.
125 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 126  Repair the open circuit in the harness between the ECM connector and crankshaft position sensor connector.
126 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 127  Repair short circuit to ground in harness between ECM connector and crankshaft position sensor connector.
127 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 128  Repair the harness and connector.
NOTE: In this case, repair the following item:
  • Open circuit or short circuit to ground in harness between main relay connector and intake camshaft position sensor connector
  • Poor contact of coupling connector
128 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 129  Repair the open circuit in the harness between ECM connector and intake camshaft position sensor connector.
129 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 130  Repair short circuit to ground in the harness between ECM connector and intake camshaft position sensor connector.
130 CHECK COMPRESSION PRESSURE. 
Check the compression pressure. Ref. to INSPECTION , Compression.		 Is the check result OK? Go to step 131  Check the engine. Ref. to INSPECTION , Engine Trouble in General.
131 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 132 
132 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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