DTC P1603: Engine Stall History: Notes

DTC detecting condition: 

Immediately at fault recognition

Wiring diagram: 

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

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 FREEZE FRAME DATA.  Using the Subaru Select Monitor, read the value in «Fuel Level». 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 «Fuel Level» 16.4% or more?	Go to step 3	Fuel may be run out. If the fault occurs after refueling, continue the diagnosis. Go to step 3
3 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» 11 V or more?	Go to step 4	Check the battery and generator. Ref. to INSPECTION , Battery. Ref. to INSPECTION , Generator.
4 CHECK FOR MALFUNCTION OCCURRENCE.	Did you ask the customer about the driving condition and engine speed status when the fault occurred?	The engine speed dropped slowly and then the engine stalled during idling or deceleration: Go to step 5  The engine speed dropped rapidly and then the engine stalled during idling or deceleration: Go to step 68  The engine stalled during standing start, acceleration, or constant speed driving: Go to step 76	Ask the customer about the driving condition and engine speed status when fault occurred.
5 CHECK FREEZE FRAME DATA.  Read the values of «Short term fuel trim B1» and «Long term fuel trim B1», using the 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. Obtain the sum values of «Short term fuel trim B1» and «Long term fuel trim B1» in each freeze frame data.	Is the sum value of «Short term fuel trim B1» and «Long term fuel trim B1» within ±15% in each freeze frame data?	Go to step 49	More than 15% in each freeze frame data: Go to step 6  Less than -15% in any one of freeze frame data: Go to step 34
6 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 7
7 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 8	Replace the faulty purge control solenoid valve. Ref. to PURGE CONTROL SOLENOID VALVE
8 CHECK FREEZE FRAME DATA.  Read the value of «Stop Light Switch» 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.	Does the value of «Stop Light Switch» indicate OFF in all freeze frame data?	Go to step 11	Go to step 9
9 CHECK CURRENT DATA.  Start the engine and warm up completely. Read the value of «Short term fuel trim B1» both when the brake pedal is released and depressed 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 value of «Short term fuel trim B1» with the brake pedal depressed increase by 10% or more compared to when the pedal is released?	Replace the brake booster. Ref. to BRAKE BOOSTER	Go to step 10
10 CHECK CURRENT DATA.  Start the engine and warm up completely. While reproducing the faulty condition of the vehicle, read the values of «Short term fuel trim B1» and «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. Obtain the sum values of «Short term fuel trim B1» and «Long term fuel trim B1».	Is the sum value of «Short term fuel trim B1» and «Long term fuel trim B1» within ±15%?	Go to step 11	Replace the brake booster. Ref. to BRAKE BOOSTER
11 CHECK IGNITION SYSTEM.  Check the ignition system. Ref. to IGNITION CONTROL SYSTEM , Diagnostics for Engine Starting Failure.	Is the check result OK?	Go to step 12	Repair the ignition system. Ref. to GENERAL DESCRIPTION
12 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 13	Replace the mass air flow and intake air temperature sensor. Ref. to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR
13 CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR.  Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connectors from the mass air flow and intake air temperature sensor. 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 14	Repair the open circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.
14 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?	Go to step 15	Repair the ground short circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.
15 CHECK CURRENT DATA.  Start the engine and warm up completely. Using the Subaru Select Monitor, read the value of «Calculated load value», then compare it with the reference value of «Calculated load value» listed in "Engine Current Data Display" in "Subaru Select Monitor". Ref. to DISPLAY CURRENT ENGINE DATA , OPERATION, Subaru Select Monitor. NOTE: The value of «Calculated load value» change depending on how the engine internal parts settle in. If the value is out of standard, judge it again by comparing the vehicle with another one with the same specifications and similar conditions such as travel distance. 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 «Calculated load value» falls between 90 - 110% of the value described in the list?	Go to step 16	Replace the mass air flow and intake air temperature sensor. Ref. to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR
16 CHECK FRONT OXYGEN (A/F) SENSOR DATA.  Start the engine and warm up completely. Raise the engine speed up to 2, 500 rpm and maintain it for approx. three minutes. Release the accelerator pedal and idle the engine. Using «Injection Quantity Control» in the «Active Test» item, read the value of «A/F Sensor #1» at the increase rate of both 12% and -12%. NOTE: Perform the operation immediately after the engine comes into idling condition, otherwise the front oxygen (A/F) sensor will be cooled. For detailed operation procedures, refer to the "Active Test". Ref. to ACTIVE TEST	Does the value of «A/F Sensor #1» change to less than 0.88 at the increase rate of 12%, and to 1.12 or more at the rate of -12%?	Go to step 20	Go to step 17
17 CHECK POWER SUPPLY TO FRONT OXYGEN (A/F) SENSOR.  Turn the ignition switch to OFF. Disconnect the connectors from front oxygen (A/F) sensor. Turn the ignition switch to ON. Measure the voltage between front oxygen (A/F) sensor connector and engine ground. Connector & terminal  (E24) No. 2 (+) - Engine ground (-):	Is the voltage 10 V or more?	Go to step 18	Repair the power supply line. NOTE: In this case, repair the following item: Open circuit in harness between A/F, oxygen sensor relay and front oxygen (A/F) sensor connector Poor contact of A/F, oxygen sensor relay connector Poor contact of coupling connector Malfunction of A/F, oxygen sensor relay
18 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR.  Turn the ignition switch to OFF. Disconnect the connector from ECM. Measure the resistance of harness between ECM connector and front oxygen (A/F) sensor connector. Connector & terminal  (E158) No. 5 - (E24) No. 1:  (E158) No. 33 - (E24) No. 4:  (E158) No. 46 - (E24) No. 3:	Is the resistance less than 1 Ω?	Go to step 19	Repair the open circuit of harness between ECM connector and front oxygen (A/F) sensor connector.
19 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR.  Measure the resistance between the ECM connector and engine ground. Connector & terminal  (E158) No. 5 - Engine ground:  (E158) No. 33 - Engine ground:  (E158) No. 46 - Engine ground:	Is the resistance 1 MΩ or more?	Go to step 20	Repair the short circuit to ground in harness between ECM connector and front oxygen (A/F) sensor connector.
20 CHECK FREEZE FRAME DATA.  Using the Subaru Select Monitor, read the values in «Coolant Temp.» and «Ambient Temperature ». 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?	Go to step 21	Go to step 24
21 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 22	Replace the engine coolant temperature sensor. Ref. to ENGINE COOLANT TEMPERATURE SENSOR
22 CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR.  Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connectors from the engine coolant temperature sensor. 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 23	Repair the open circuit of the harness between the ECM connector and engine coolant temperature sensor connector.
23 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 24	Repair the short circuit to ground in harness between ECM connector and engine coolant temperature sensor connector.
24 CHECK FREEZE FRAME DATA.  Using the Subaru Select Monitor, read the value in «Evap Purge Flow». 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 «Evap Purge Flow» 0% in all freeze frame data?	Go to step 30	Go to step 25
25 CHECK PURGE CONTROL SOLENOID VALVE.  Select «CPC Solenoid Valve» from "Actuator ON/OFF Operation" in "Active Test". NOTE: For detailed operation procedures, refer to the "Active Test". Ref. to ACTIVE TEST Check if the ventilation changes according to ON/OFF switching operation.	Does the ventilation of purge control solenoid valve change correctly?	Go to step 29	Go to step 26
26 CHECK POWER SUPPLY TO PURGE CONTROL SOLENOID VALVE CONNECTOR.  Turn the ignition switch to OFF. Disconnect the connector from the purge control solenoid valve. Turn the ignition switch to ON. Measure the voltage between purge control solenoid valve connector and engine ground. Connector & terminal  (E4) No. 1 (+) - Engine ground (-):	Is the voltage 10 V or more?	Go to step 27	Repair the power supply circuit.
27 CHECK HARNESS BETWEEN ECM AND PURGE CONTROL SOLENOID VALVE CONNECTOR.  Turn the ignition switch to OFF. Disconnect the connector from ECM. Measure the resistance of harness between ECM connector and purge control solenoid valve connector. Connector & terminal  (E158) No. 51 - (E4) No. 2:	Is the resistance less than 1 Ω?	Go to step 28	Repair the open circuit in harness between ECM connector and purge control solenoid valve connector.
28 CHECK HARNESS BETWEEN ECM AND PURGE CONTROL SOLENOID VALVE CONNECTOR.  Measure the resistance between the purge control solenoid valve connector and engine ground. Connector & terminal  (E4) No. 2 - Engine ground:	Is the resistance 1 MΩ or more?	Go to step 29	Repair the ground short circuit of harness between ECM connector and purge control solenoid valve 1 connector.
29 CHECK FOR POOR CONTACT.  Check for poor contact of ECM connector.	Is there poor contact of ECM connector?	Repair the poor contact of ECM connector.	Replace the ECM. Ref. to ENGINE CONTROL MODULE (ECM)
30 CHECK OF FUEL PUMP.  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 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 32	Go to step 31
31 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
32 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 33
33 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 34	Check the fuel pump and fuel delivery line. Ref. to INSPECTION , Fuel Pump. Ref. to INSPECTION , Fuel Delivery and Evaporation Lines.
34 CHECK IGNITION SYSTEM.  Check the ignition system. Ref. to IGNITION CONTROL SYSTEM , Diagnostics for Engine Starting Failure.	Is the check result OK?	Go to step 35	Repair the ignition system. Ref. to GENERAL DESCRIPTION
35 CHECK FREEZE FRAME DATA.  Using the Subaru Select Monitor, read the value of «Calculated load value», then compare it with the reference value of «Calculated load value» listed in "Engine Current Data Display" in "Subaru Select Monitor". Ref. to DISPLAY CURRENT ENGINE DATA , OPERATION, Subaru Select Monitor. NOTE: The value of «Calculated load value» change depending on how the engine internal parts settle in. If the value is out of standard, judge it again by comparing the vehicle with another one with the same specifications and similar conditions such as travel distance. 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 «Calculated load value» 110% or more of the value described in the list?	Go to step 36	Go to step 40
36 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 37	Replace the mass air flow and intake air temperature sensor. Ref. to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR
37 CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR.  Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connectors from the mass air flow and intake air temperature sensor. 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. 3:  (B134) No. 17 - (B3) No. 4:	Is the resistance less than 1 Ω?	Go to step 38	Repair the open circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.
38 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?	Go to step 39	Repair the ground short circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.
39 CHECK CURRENT DATA.  Start the engine and warm up completely. Using the Subaru Select Monitor, read the value of «Calculated load value», then compare it with the reference value of «Calculated load value» listed in "Engine Current Data Display" in "Subaru Select Monitor". Ref. to DISPLAY CURRENT ENGINE DATA , OPERATION, Subaru Select Monitor. NOTE: The value of «Calculated load value» change depending on how the engine internal parts settle in. If the value is out of standard, judge it again by comparing the vehicle with another one with the same specifications and similar conditions such as travel distance. 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 «Calculated load value» falls between 90 - 110% of the value described in the list?	Go to step 40	Replace the mass air flow and intake air temperature sensor. Ref. to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR
40 CHECK CURRENT DATA.  Start the engine and warm up completely. Raise the engine speed up to 2, 500 rpm and maintain it for approx. three minutes. Release the accelerator pedal and idle the engine. Using «Injection Quantity Control» in the «Active Test» item, read the value of «A/F Sensor #1» at the increase rate of both 12% and -12%. NOTE: Perform the operation immediately after the engine comes into idling condition, otherwise the front oxygen (A/F) sensor will be cooled. For detailed operation procedures, refer to the "Active Test". Ref. to ACTIVE TEST	Does the value of «A/F Sensor #1» change to less than 0.88 at the increase rate of 12%, and to 1.12 or more at the rate of -12%?	Go to step 45	Go to step 41
41 CHECK FREEZE FRAME DATA.  Read the value of «A/F Sensor #1 Resistance» using the 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 «A/F Sensor #1 Resistance» 500 Ω or more?	Replace the front oxygen (A/F) sensor. Ref. to FRONT OXYGEN (A/F) SENSOR	Go to step 42
42 CHECK POWER SUPPLY TO FRONT OXYGEN (A/F) SENSOR. Turn the ignition switch to OFF. Disconnect the connectors from front oxygen (A/F) sensor. Turn the ignition switch to ON. Measure the voltage between front oxygen (A/F) sensor connector and engine ground. Connector & terminal  (E24) No. 2 (+) - Engine ground (-):	Is the voltage 10 V or more?	Go to step 43	Repair the power supply line. NOTE: In this case, repair the following item: Open circuit in harness between A/F, oxygen sensor relay and front oxygen (A/F) sensor connector Poor contact of A/F, oxygen sensor relay connector Poor contact of coupling connector Malfunction of A/F, oxygen sensor relay
43 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connector from ECM. Measure the resistance of harness between ECM connector and front oxygen (A/F) sensor connector. Connector & terminal  (E158) No. 5 - (E24) No. 1:  (E158) No. 33 - (E24) No. 4:  (E158) No. 46 - (E24) No. 3:	Is the resistance less than 1 Ω?	Go to step 44	Repair the open circuit of harness between ECM connector and front oxygen (A/F) sensor connector.
44 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR.  Measure the resistance between the ECM connector and engine ground. Connector & terminal  (E158) No. 5 - Engine ground:  (E158) No. 33 - Engine ground:  (E158) No. 46 - Engine ground:	Is the resistance 1 MΩ or more?	Go to step 45	Repair the short circuit to ground in harness between ECM connector and front oxygen (A/F) sensor connector.
45 CHECK FREEZE FRAME DATA.  Using the Subaru Select Monitor, read the values in «Coolant Temp.» and «Ambient Temperature ». 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?	Go to step 46	Perform the Clear Memory Mode to complete. Ref. to CLEAR MEMORY MODE
46 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 47	Replace the engine coolant temperature sensor. Ref. to ENGINE COOLANT TEMPERATURE SENSOR
47 CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR.  Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connectors from the engine coolant temperature sensor. 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 48	Repair the open circuit of the harness between the ECM connector and engine coolant temperature sensor connector.
48 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?	Even if DTC is detected, it has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.	Repair the short circuit to ground in harness between ECM connector and engine coolant temperature sensor connector.
49 CHECK IGNITION SYSTEM.  Check the ignition system. Ref. to IGNITION CONTROL SYSTEM , Diagnostics for Engine Starting Failure.	Is the check result OK?	Go to step 50	Repair the ignition system. Ref. to GENERAL DESCRIPTION
50 CHECK FREEZE FRAME DATA.  Using Subaru Select Monitor, read the values of «Idle Mass Air Flow Feedback correct», «ISC Learning Value» and «Idle dirty throttle correct» in freeze frame data. 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. Obtain the sum value of «Idle Mass Air Flow Feedback correct», «ISC Learning Value» and «Idle dirty throttle correct». Start the engine and warm up completely. Using Subaru Select Monitor, read the values of «Idle Mass Air Flow Feedback correct», «ISC Learning Value» and «Idle dirty throttle correct» in current data at normal idling. NOTE: For detailed operation procedures, refer to "Current Data Display For Engine". Ref. to DISPLAY CURRENT ENGINE DATA , OPERATION, Subaru Select Monitor. Obtain the sum value of «Idle Mass Air Flow Feedback correct», «ISC Learning Value» and «Idle dirty throttle correct».	Is the sum value of freeze frame data less than 80% of the sum value of current data?	Go to step 51	Go to step 53
51 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 52
52 CHECK AIR INTAKE SYSTEM.  Check the air intake system related parts. Brake booster: Ref. to INSPECTION , Brake Booster. Mass air flow and intake air temperature sensor: Ref. to INSPECTION , Mass Air Flow and Intake Air Temperature Sensor. PCV hose: Ref. to INSPECTION , PCV Hose. PCV valve: Ref. to INSPECTION , PCV Valve. Purge control solenoid valve: Ref. to INSPECTION , Purge Control Solenoid Valve.	Are all of the air intake system related parts normal?	Go to step 62	Replace the parts if defective.
53 CHECK FREEZE FRAME DATA.  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. 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 62	Diagnose the part that does not synchronize. Intake RH: Go to step 54  Intake LH: Go to step 58
54 CHECK POWER SUPPLY TO THE INTAKE OIL CONTROL SOLENOID RH.  Turn the ignition switch to OFF. Disconnect the connector from the intake oil control solenoid RH. Turn the ignition switch to ON. 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 55	Repair the power supply circuit.
55 CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID RH CONNECTOR.  Turn the ignition switch to OFF. Disconnect the connector from ECM. 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 56	Repair the open circuit in harness between ECM connector and intake oil control solenoid RH connector.
56 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 57	Repair the short circuit to ground in harness between ECM connector and intake oil control solenoid RH connector.
57 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
58 CHECK POWER SUPPLY TO THE INTAKE OIL CONTROL SOLENOID LH.  Turn the ignition switch to OFF. Disconnect the connector from the intake oil control solenoid LH. Turn the ignition switch to ON. 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 59	Repair the power supply circuit.
59 CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID LH CONNECTOR.  Turn the ignition switch to OFF. Disconnect the connector from ECM. 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 60	Repair the open circuit in harness between ECM connector and intake oil control solenoid LH connector.
60 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 61	Repair the short circuit to ground in harness between ECM connector and intake oil control solenoid LH connector.
61 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
62 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 63	Replace the engine coolant temperature sensor. Ref. to ENGINE COOLANT TEMPERATURE SENSOR
63 CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR.  Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connectors from the engine coolant temperature sensor. 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 64	Repair the open circuit of the harness between the ECM connector and engine coolant temperature sensor connector.
64 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 65	Repair the short circuit to ground in harness between ECM connector and engine coolant temperature sensor connector.
65 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 66	Replace the mass air flow and intake air temperature sensor. Ref. to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR
66 CHECK MANIFOLD ABSOLUTE PRESSURE SENSOR.  Check the manifold absolute pressure sensor. Ref. to MANIFOLD ABSOLUTE PRESSURE SENSOR	Is the check result OK?	Perform the Clear Memory Mode to complete. Ref. to CLEAR MEMORY MODE	Check the manifold absolute pressure sensor. Ref. to MANIFOLD ABSOLUTE PRESSURE SENSOR Go to step 67
67 CHECK POWER SUPPLY CIRCUIT OF FUEL INJECTOR.  Turn the ignition switch to OFF. Disconnect the connector from fuel injector. Turn the ignition switch to ON. 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 68	Repair the power supply circuit.
68 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR.  Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connector from fuel injector. 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 69	Repair the open circuit of the harness between the ECM connector and fuel injector connector.
69 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 70	Repair the short circuit to ground in harness between ECM connector and fuel injector connector.
70 CHECK IGNITION SYSTEM.  Check the ignition system. Ref. to IGNITION CONTROL SYSTEM , Diagnostics for Engine Starting Failure.	Is the check result OK?	Go to step 71	Repair the ignition system. Ref. to GENERAL DESCRIPTION
71 CHECK FREEZE FRAME DATA.  Using the Subaru Select Monitor, read the value of «A/C Compressor Signal». 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 «A/C Compressor Signal» ON output?	Go to step 72	Go to step 73
72 CHECK FREEZE FRAME DATA.  Using the Subaru Select Monitor, read the value of «Idle A/C load correct». 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 «Idle A/C load correct» increasing?	Check the air conditioner. Ref. to DIAGNOSTICS WITH PHENOMENON Ref. to PROCEDURE , Basic Diagnostic Procedure.	Go to step 73
73 CHECK FREEZE FRAME DATA.  Using the Subaru Select Monitor, read the value of «Electric Load Feedback Val». 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. Compare the value of «Electric Load Feedback Val» with that of «Idle Mass Air Flow», which is described in "Engine Current Data Display". Ref. to DISPLAY CURRENT ENGINE DATA , OPERATION, 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 «Electric Load Feedback Val» 20% or more than «Idle Mass Air Flow»?	Check the generator and power assisted system. Ref. to INSPECTION , Generator. Ref. to BASIC DIAGNOSTIC PROCEDURE	Go to step 74
74 CHECK FREEZE FRAME DATA.  Using the Subaru Select Monitor, read the values of «Vehicle Speed», «Engine Speed» and «AT turbine 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 there any freeze frame data indicating that the value of «Vehicle Speed» is less than 6 km/h (18.6 MPH), and that the difference in values between «Engine Speed» and «AT turbine speed» is less than 100 rpm?	Repair the CVT. Ref. to GENERAL DESCRIPTION	Go to step 75
75 CHECK DTC.	Is DTC of CVT displayed? Ref. to OPERATION , Read Diagnostic Trouble Code (DTC).	Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC)	Even if DTC is detected, it has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
76 CHECK FREEZE FRAME DATA.  Using the Subaru Select Monitor, read the values in «Calculated load value» and «Relative Throttle Pos.». 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 «Calculated load value» decreasing while that of «Relative Throttle Pos.» is increasing?	Go to step 77	Go to step 82
77 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 78	Replace the mass air flow and intake air temperature sensor. Ref. to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR
78 CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR.  Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connectors from the mass air flow and intake air temperature sensor. 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 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. 16 - Engine ground:  (B134) No. 17 - Engine ground:	Is the resistance 1 MΩ or more?	Go to step 80	Repair the ground short circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.
80 CHECK CURRENT DATA.  Start the engine and warm up completely. Using the Subaru Select Monitor, read the value of «Calculated load value», then compare it with the reference value of «Calculated load value» listed in "Engine Current Data Display" in "Subaru Select Monitor". Ref. to DISPLAY CURRENT ENGINE DATA , OPERATION, Subaru Select Monitor. NOTE: The value of «Calculated load value» change depending on how the engine internal parts settle in. If the value is out of standard, judge it again by comparing the vehicle with another one with the same specifications and similar conditions such as travel distance. 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 «Calculated load value» falls between 90 - 110% of the value described in the list?	Go to step 81	Replace the mass air flow and intake air temperature sensor. Ref. to MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR
81 CHECK POWER SUPPLY CIRCUIT OF FUEL INJECTOR.  Turn the ignition switch to OFF. Disconnect the connector from fuel injector. Turn the ignition switch to ON. 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 82	Repair the power supply circuit.
82 CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR.  Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connector from fuel injector. 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 83	Repair the open circuit of the harness between the ECM connector and fuel injector connector.
83 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 84	Repair the short circuit to ground in harness between ECM connector and fuel injector connector.
84 CHECK IGNITION SYSTEM.  Check the ignition system. Ref. to IGNITION CONTROL SYSTEM , Diagnostics for Engine Starting Failure.	Is the check result OK?	Go to step 85	Repair the ignition system. Ref. to GENERAL DESCRIPTION
85 CHECK OF FUEL PUMP.  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 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 87	Go to step 86
86 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
87 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 88
88 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 89	Check the fuel pump and fuel delivery line. Ref. to INSPECTION , Fuel Pump. Ref. to INSPECTION , Fuel Delivery and Evaporation Lines.
89 CHECK ENGINE RUNNING CONDITION.  Check the engine running condition using "Roughness monitor" in the Subaru Select Monitor. NOTE: For detailed operation procedures, refer to "Application help".	Is there a large difference in the speed between each cylinder?	It is possible that the compression pressure of the engine is not sufficient. Check the engine. Ref. to INSPECTION , Engine Trouble in General.	Perform the Clear Memory Mode to complete. Ref. to CLEAR MEMORY MODE