DTC P1603: Engine Stall History: Notes

DTC detecting condition: 

Immediately at fault recognition

Wiring diagram: 

Engine Electrical System. Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>ENGINE ELECTRICAL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAG)>DIAGNOSTIC TROUBLE CODE (DTC) .

Is DTC other than P1603 displayed? (Current malfunction)

Yes:  Check DTC using "Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>DIAGNOSTIC TROUBLE CODE (DTC) .

No:  Go to  2.

Using the Subaru Select Monitor, read the value in [Fuel Level Input].

Is the value of [Fuel Level Input] 16.4 [%] or more?

Yes:  Go to  3.

No:  Fuel may be run out. If the fault occurs after refueling, continue the diagnosis. Go to  3.

Using the Subaru Select Monitor, read the value in [Control module voltage].

Is the value of [Control module voltage] 11 [V] or more?

Yes:  Go to  4.

No:  Check the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DO (HEV))>BATTERY>INSPECTION .

Check for the condition of fault occurrence.

Did you ask the customer about the driving condition and engine speed status when the fault occurred?

Yes 

• The engine speed dropped slowly and then the engine stalled during idling or deceleration: Go to  5.
• The engine speed dropped rapidly and then the engine stalled during idling or deceleration: Go to  78.
• The engine stalled during standing start, acceleration, or constant speed driving: Go to  82.

No:  Ask the customer about the driving condition and engine speed status when fault occurred.

1. Using the Subaru Select Monitor, read the values in [Short term fuel trim B1] and [Long term fuel trim B1].
   NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>FREEZE FRAME DATA .
2. 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?

   Yes:  Go to  52.

   No 

   • More than 15% in each freeze frame data: Go to  6.
   • Less than -15% in any one of freeze frame data: Go to  36.

Check the installing condition of the air intake system.

Are there holes, loose bolts or disconnection of hose on air intake system?

Yes:  Repair the air intake system. Ref. to.

No:  Go to  7.

Check the purge control solenoid valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (HEV))>PURGE CONTROL SOLENOID VALVE>INSPECTION .

Is the check result OK?

Yes:  Go to  8.

No:  Replace the purge control solenoid valve. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (HEV))>PURGE CONTROL SOLENOID VALVE .

Using the Subaru Select Monitor, read the value in [Stop Light Switch].

Is the value of [Stop Light Switch] [OFF] in all freeze frame data?

Yes:  Go to  11.

No:  Go to  9.

1. Turn the ignition switch to ON.
2. Navigate to Inspection Mode for measuring Exhaust Gas. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>WORK SUPPORT>OPERATION>SERVICE MODE .
   NOTE: If it is necessary to run the engine for 10 minutes or more, fasten the driver's seat belt.
3. Start the engine and warm up completely.
4. 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 "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA 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?

   Yes:  Replace the brake booster. Ref. to BRAKE>BRAKE BOOSTER .

   No:  Go to  10.

1. Turn the ignition switch to ON.
2. Navigate to Inspection Mode for measuring Exhaust Gas. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>WORK SUPPORT>OPERATION>SERVICE MODE .
   NOTE: If it is necessary to run the engine for 10 minutes or more, fasten the driver's seat belt.
3. Start the engine and warm up completely.
4. 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 "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .
5. 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[%]?

   Yes:  Go to  11.

   No:  Replace the brake booster. Ref. to BRAKE>BRAKE BOOSTER .

Check the ignition system. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>DIAGNOSTICS WITH PHENOMENON>IGNITION CONTROL SYSTEM .

Is the check result OK?

Yes:  Go to  12.

No:  Repair the ignition system. Ref. to.

Using the Subaru Select Monitor, read the value in [A/F Sensor #1].

Is the value of [A/F Sensor #1] 1 or more?

Yes:  Go to  17.

No:  Go to  13.

Check the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR>INSPECTION .

Is the check result OK?

Yes:  Go to  14.

No:  Replace the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR .

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. Disconnect the connector from manifold absolute pressure sensor.
5. Measure the resistance of harness between ECM connector and the mass air flow and intake air temperature sensor connector, and between ECM connector and the manifold absolute pressure sensor connector.

   Connector & terminal 

   (B134) No. 32 - (E173) No. 1:

   (B134) No. 54 - (E173) No. 2:

   (B134) No. 53 - (E173) No. 3:

   (B134) No. 43 - (E173) No. 4:

   (E158) No. 41 - (E21) No. 1:

   (E158) No. 58 - (E21) No. 2:

   (E158) No. 69 - (E21) No. 3:

   Is the resistance less than 1 Ω?

   Yes:  Go to  15.

   No:  Check the harnesses and connectors, and repair or replace them if necessary.

   NOTE: In this case, repair the following item:

   • Open circuit in harness between ECM connector and the mass air flow and intake air temperature sensor connector
   • Open circuit of harness between ECM connector and manifold absolute pressure sensor connector
   • Poor contact of J/C

Measure the resistance between the ECM connector and engine ground.

Connector & terminal 

(B134) No. 32 - Engine ground:

(B134) No. 53 - Engine ground:

(B134) No. 43 - Engine ground:

(E158) No. 41 - Engine ground:

(E158) No. 69 - Engine ground:

Is the resistance 1 MΩ or more?

Yes:  Go to  16.

No:  Check the harnesses and connectors, and repair or replace them if necessary.

1. Turn the ignition switch to ON.
2. Navigate to Inspection Mode for measuring Exhaust Gas. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>WORK SUPPORT>OPERATION>SERVICE MODE .
   NOTE: If it is necessary to run the engine for 10 minutes or more, fasten the driver's seat belt.
3. Start the engine and warm up completely.
4. Using the Subaru Select Monitor, read the value of [Calculated load value], then compare it with the value of [Calculated load value] listed in "Data Monitor".
   NOTE:

   • The value of Calculated load value changes 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 "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .

   Does the value of [Calculated load value] fall between 90 - 110[%] of the value described in the list?

   Yes:  Go to  21.

   No:  Replace the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR .

1. Turn the ignition switch to ON.
2. Navigate to Inspection Mode for measuring Exhaust Gas. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>WORK SUPPORT>OPERATION>SERVICE MODE .
   NOTE: If it is necessary to run the engine for 10 minutes or more, fasten the driver's seat belt.
3. Start the engine and warm up completely.
4. Raise the engine speed up to 2, 000 rpm and maintain it for approx. three minutes.
5. Release the accelerator pedal and idle the engine.
6. Using [Injection Quantity Control] in "Active Test" items, 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 ENGINE (DIAGNOSTICS) (H4DO (HEV))>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%?

   Yes:  Go to  21.

   No:  Go to  18.

1. Turn the ignition switch to OFF.
2. Disconnect the connector from the front oxygen (A/F) sensor.
3. Turn the ignition switch to ON.
4. Measure the voltage between front oxygen (A/F) sensor connector and engine ground.

   Connector & terminal 

   (B379) No. 2 (+) - Engine ground (-):

   Is the voltage 10 V or more?

   Yes:  Go to  19.

   No:  Repair the power supply line.

   NOTE: In this case, repair the following item:

   • Open circuit of harness between main relay and front oxygen (A/F) sensor connector
   • Poor contact of main relay connector
   • Defective main relay

1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Measure the resistance of harness between ECM connector and front oxygen (A/F) sensor connector.

   Connector & terminal 

   (E158) No. 88 - (B379) No. 1:

   (E158) No. 3 - (B379) No. 3:

   (E158) No. 4 - (B379) No. 4:

   Is the resistance less than 1 Ω?

   Yes:  Go to  20.

   No:  Check the harnesses and connectors, and repair or replace them if necessary.

   NOTE: In this case, repair the following item:

   • Open circuit in harness between ECM connector and front oxygen (A/F) sensor connector
   • Poor contact of coupling connector

Measure the resistance between the ECM connector and engine ground.

Connector & terminal 

(E158) No. 88 - Engine ground:

(E158) No. 3 - Engine ground:

(E158) No. 4 - Engine ground:

Is the resistance 1 MΩ or more?

Yes:  Go to  21.

No:  Repair the short circuit to ground in harness between ECM connector and front oxygen (A/F) sensor connector.

Using the Subaru Select Monitor, read the values in [Engine Coolant Temperature] and [Ambient Temperature].

Is the value of [Engine Coolant Temperature] 120[°C] (248°F) or more? Or is the value of [Engine Coolant Temperature] 15[°C] (27°F) or more lower than that of [Ambient Temperature]?

Yes:  Go to  22.

No:  Go to  25.

Check the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>ENGINE COOLANT TEMPERATURE SENSOR>INSPECTION .

Is the check result OK?

Yes:  Go to  23.

No:  Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>ENGINE COOLANT TEMPERATURE SENSOR .

1. Turn the ignition switch to OFF.
2. Disconnect the connectors from ECM and engine coolant temperature sensor.
3. Measure the resistance of harness between ECM connector and engine coolant temperature sensor connector.

   Connector & terminal 

   (E158) No. 58 - (E8) No. 1:

   (E158) No. 55 - (E8) No. 2:

   Is the resistance less than 1 Ω?

   Yes:  Go to  24.

   No:  Repair the open circuit of the harness between the ECM connector and engine coolant temperature sensor connector.

Measure the resistance between the ECM connector and engine ground.

Connector & terminal 

(E158) No. 55 - Engine ground:

Is the resistance 1 MΩ or more?

Yes:  Go to  25.

No:  Repair the short circuit to ground in harness between ECM connector and engine coolant temperature sensor connector.

Using the Subaru Select Monitor, read the value in [Evap Purge Flow].

Is the value of [Evap Purge Flow] 0[%] in all freeze frame data?

Yes:  Go to  31.

No:  Go to  26.

1. On "Active Test" item, select [CPC Solenoid Valve].
   NOTE: For detailed operation procedures, refer to the "Active Test". Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV)>ACTIVE TEST .
2. Check if the ventilation changes according to ON/OFF switching operation.

   Does the ventilation of purge control solenoid valve change correctly?

   Yes:  Go to  30.

   No:  Go to  27.

1. Turn the ignition switch to OFF.
2. Disconnect the connector from the purge control solenoid valve.
3. Turn the ignition switch to ON.
4. 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?

   Yes:  Go to  28.

   No:  Check the harnesses and connectors, and repair or replace them if necessary.

   NOTE: In this case, repair the following item:

   • Power supply circuit
   • Poor contact of coupling connector

1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Measure the resistance of harness between ECM connector and purge control solenoid valve connector.

   Connector & terminal 

   (E158) No. 9 - (E4) No. 2:

   Is the resistance less than 1 Ω?

   Yes:  Go to  29.

   No:  Repair the open circuit in harness between ECM connector 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?

Yes:  Go to  30.

No:  Repair the short circuit to ground in harness between ECM connector and purge control solenoid valve connector.

Check for poor contact of ECM connector.

Is there poor contact of ECM connector?

Yes:  Repair the poor contact of ECM connector.

No:  Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS (H4DO (HEV))>ENGINE CONTROL MODULE (ECM) .

1. On "Active Test" item, select [Fuel Pump Relay].
   NOTE: For detailed operation procedures, refer to the "Active Test". Ref. to ENGINE (DIAGNOSTICS) (H4DO HEV))>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?

   Yes:  Go to  33.

   No:  Go to  32.

Check fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>FUEL PUMP>INSPECTION .

Is the check result OK?

Yes:  Check fuel pump system. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>DIAGNOSTICS WITH PHENOMENON>FUEL PUMP CIRCUIT .

No:  Replace the fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>FUEL PUMP .

Check if any foreign matters such as iron powder exist in the fuel tank.

Is there any foreign matter in the fuel tank?

Yes:  Remove foreign matter from the fuel tank.

No:  Go to  34.

Measure the fuel pressure. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>FUEL PRESSURE>INSPECTION .

Is the measured value 350 - 450 kPa (3.5 - 4.6 kg/cm² , 50 - 66 psi)?

Yes:  Go to  35.

No:  Check the fuel pump and fuel delivery line. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>FUEL PUMP>INSPECTION . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>FUEL DELIVERY AND EVAPORATION LINES>INSPECTION .

Using the Subaru Select Monitor, read the values in [Fuel Rail Pressure A] and [Commanded Fuel Rail Pressure A].

Is the value in [Fuel Rail Pressure A] synchronized with the one in [Commanded Fuel Rail Pressure A] in all freeze frame data?

Clear the memory to complete. Ref. to COMMON (DIAG)>CLEAR MEMORY .

Check the high-pressure fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>HIGH PRESSURE FUEL PUMP>INSPECTION .

Check the ignition system. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>DIAGNOSTICS WITH PHENOMENON>IGNITION CONTROL SYSTEM .

Is the check result OK?

Yes:  Go to  37.

No:  Repair the ignition system. Ref. to ENGINE IGNITION SYSTEM .

Using the Subaru Select Monitor, read the value of [Calculated load value], then compare it with the value of [Calculated load value] listed in "Freeze Frame Data".

Is the value of [Calculated load value] 110[%] or more of the value described in the list?

Yes:  Go to  39.

No:  Go to  38.

Using the Subaru Select Monitor, read the value in [A/F Sensor #1].

Is the value of [A/F Sensor #1] less than 1?

Yes:  Go to  43.

No:  Go to  48.

Check the mass air flow and intake air temperature sensor and the manifold absolute pressure sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR>INSPECTION . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MANIFOLD ABSOLUTE PRESSURE SENSOR>INSPECTION .

Is the check result OK?

Yes:  Go to  40.

No:  Replace the mass air flow and intake air temperature sensor or the manifold absolute pressure sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MANIFOLD ABSOLUTE PRESSURE SENSOR .

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. Disconnect the connector from manifold absolute pressure sensor.
5. Measure the resistance of harness between ECM connector and the mass air flow and intake air temperature sensor connector, and between ECM connector and the manifold absolute pressure sensor connector.

   Connector & terminal 

   (B134) No. 32 - (B3) No. 1:

   (B134) No. 54 - (B3) No. 2:

   (B134) No. 53 - (B3) No. 3:

   (B134) No. 43 - (B3) No. 4:

   (E158) No. 41 - (E21) No. 1:

   (E158) No. 58 - (E21) No. 2:

   (E158) No. 69 - (E21) No. 3:

   Is the resistance less than 1 Ω?

   Yes:  Go to  41.

   No:  Check the harnesses and connectors, and repair or replace them if necessary.

   NOTE: In this case, repair the following item:

   • Open circuit in harness between ECM connector and the mass air flow and intake air temperature sensor connector
   • Open circuit of harness between ECM connector and manifold absolute pressure sensor connector
   • Poor contact of J/C

Measure the resistance between the ECM connector and engine ground.

Connector & terminal 

(B134) No. 32 - Engine ground:

(B134) No. 53 - Engine ground:

(B134) No. 43 - Engine ground:

(E158) No. 41 - Engine ground:

(E158) No. 69 - Engine ground:

Is the resistance 1 MΩ or more?

Yes:  Go to  42.

No:  Check the harnesses and connectors, and repair or replace them if necessary.

1. Turn the ignition switch to ON.
2. Navigate to Inspection Mode for measuring Exhaust Gas. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>WORK SUPPORT>OPERATION>SERVICE MODE .
   NOTE: If it is necessary to run the engine for 10 minutes or more, fasten the driver's seat belt.
3. Start the engine and warm up completely.
4. Using the Subaru Select Monitor, read the value of [Calculated load value], then compare it with the value of [Calculated load value] listed in "Data Monitor".
   NOTE:

   • The value of Calculated load value changes 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 "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .

   Does the value of [Calculated load value] fall between 90 - 110[%] of the value described in the list?

   Yes:  Go to  43.

   No:  Replace the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR .

1. Turn the ignition switch to ON.
2. Navigate to Inspection Mode for measuring Exhaust Gas. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>WORK SUPPORT>OPERATION>SERVICE MODE .
   NOTE: If it is necessary to run the engine for 10 minutes or more, fasten the driver's seat belt.
3. Start the engine and warm up completely.
4. Raise the engine speed up to 2, 000 rpm and maintain it for approx. three minutes.
5. Release the accelerator pedal and idle the engine.
6. Using [Injection Quantity Control] in "Active Test" items, 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 ENGINE (DIAGNOSTICS) (H4DO (HEV))>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%?

   Yes:  Go to  48.

   No:  Go to  44.

Using the Subaru Select Monitor, read the value in [A/F Sensor #1 Resistance].

Is the value of [A/F Sensor #1 Resistance] 500 [ohm] or more?

Yes:  Replace the front oxygen (A/F) sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>FRONT OXYGEN (A/F) SENSOR .

No:  Go to  45.

1. Turn the ignition switch to OFF.
2. Disconnect the connector from the front oxygen (A/F) sensor.
3. Turn the ignition switch to ON.
4. Measure the voltage between front oxygen (A/F) sensor connector and engine ground.

   Connector & terminal 

   (B379) No. 2 (+) - Engine ground (-):

   Is the voltage 10 V or more?

   Yes:  Go to  46.

   No:  Repair the power supply line.

   NOTE: In this case, repair the following item:

   • Open circuit of harness between main relay and front oxygen (A/F) sensor connector
   • Poor contact of main relay connector
   • Defective main relay

1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Measure the resistance of harness between ECM connector and front oxygen (A/F) sensor connector.

   Connector & terminal 

   (E158) No. 88 - (B379) No. 1:

   (E158) No. 3 - (B379) No. 3:

   (E158) No. 4 - (B379) No. 4:

   Is the resistance less than 1 Ω?

   Yes:  Go to  47.

   No:  Check the harnesses and connectors, and repair or replace them if necessary.

   NOTE: In this case, repair the following item:

   • Open circuit in harness between ECM connector and front oxygen (A/F) sensor connector
   • Poor contact of coupling connector

Measure the resistance between the ECM connector and engine ground.

Connector & terminal 

(E158) No. 88 - Engine ground:

(E158) No. 3 - Engine ground:

(E158) No. 4 - Engine ground:

Is the resistance 1 MΩ or more?

Yes:  Go to  48.

No:  Repair the short circuit to ground in harness between ECM connector and front oxygen (A/F) sensor connector.

Using the Subaru Select Monitor, read the values in [Engine Coolant Temperature] and [Ambient Temperature].

Is the value of [Engine Coolant Temperature] 120[°C] (248°F) or more? Or is the value of [Engine Coolant Temperature] 15[°C] (27°F) or more lower than that of [Ambient Temperature]?

Yes:  Go to  49.

No:  Clear the memory to complete. Ref. to COMMON (DIAG)>CLEAR MEMORY .

Check the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>ENGINE COOLANT TEMPERATURE SENSOR>INSPECTION .

Is the check result OK?

Yes:  Go to  50.

No:  Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>ENGINE COOLANT TEMPERATURE SENSOR .

1. Turn the ignition switch to OFF.
2. Disconnect the connectors from ECM and engine coolant temperature sensor.
3. Measure the resistance of harness between ECM connector and engine coolant temperature sensor connector.

   Connector & terminal 

   (E158) No. 58 - (E8) No. 1:

   (E158) No. 55 - (E8) No. 2:

   Is the resistance less than 1 Ω?

   Yes:  Go to  51.

   No:  Repair the open circuit of the harness between the ECM connector and engine coolant temperature sensor connector.

Measure the resistance between the ECM connector and engine ground.

Connector & terminal 

(E158) No. 55 - Engine ground:

Is the resistance 1 MΩ or more?

Yes:  Even i (DTC is detected, it has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

No:  Repair the short circuit to ground in harness between ECM connector and engine coolant temperature sensor connector.

Check the ignition system. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>DIAGNOSTICS WITH PHENOMENON>IGNITION CONTROL SYSTEM .

Is the check result OK?

Yes:  Go to  53.

No:  Repair the ignition system. Ref. to ENGINE IGNITION SYSTEM .

1. Using the Subaru Select Monitor, read the values of the Freeze Frame Data in [Idle Mass Air Flow Feedback correct], [ISC Learning Value] and [Idle dirty throttle correct].
   NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>FREEZE FRAME DATA .
2. Obtain the sum values of [Idle Mass Air Flow Feedback correct], [ISC Learning Value] and [Idle dirty throttle correct].
3. Turn the ignition switch to ON.
4. Navigate to Inspection Mode for measuring Exhaust Gas. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>WORK SUPPORT>OPERATION>SERVICE MODE .
   NOTE: If it is necessary to run the engine for 10 minutes or more, fasten the driver's seat belt.
5. Start the engine and warm up completely.
6. Using the Subaru Select Monitor, read the values of data monitor in [Idle Mass Air Flow Feedback correct], [ISC Learning Value] and [Idle dirty throttle correct] during normal idling.
   NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .
7. Obtain the sum values 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?

   Yes:  Go to  54.

   No:  Go to  56.

Check the installing condition of the air intake system.

Are there holes, loose bolts or disconnection of hose on air intake system?

Yes:  Repair the air intake system. Ref. to ENGINE INTAKE SYSTEM (INDUCTION) .

No:  Go to  55.

Check the installing condition of the air intake system.

• Brake booster: Ref. to BRAKE>BRAKE BOOSTER>INSPECTION .
• Mass air flow and intake air temperature sensor: Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR>INSPECTION .
• PCV connector: Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (HEV))>PCV CONNECTOR>INSPECTION .
• PCV hose: Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (HEV))>PCV HOSE>INSPECTION .
• PCV hose assembly: Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (HEV))>PCV HOSE>INSPECTION .
• PCV valve: Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (HEV))>PCV VALVE>INSPECTION .
• Purge control solenoid valve: Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DO (HEV))>PURGE CONTROL SOLENOID VALVE>INSPECTION .

Is the check result OK?

Yes:  Go to  73.

No:  Replace the parts if defective.

1. Using the Subaru Select Monitor, read the values in [VVT Adv. Ang. Amount R], [VVT Advance Target Angle Amount R], [VVT Adv. Ang. Amount L], [VVT Advance Target Angle Amount L], [Exh. VVT Retard Ang. R], [Ex VVT Retard Target Angle R], [Exh. VVT Retard Ang. L] and [Ex VVT Retard Target Angle L].
   NOTE: For detailed operation procedures, refer to "Common (Diagnostics)". Ref. to COMMON (DIAG)>FREEZE FRAME DATA .
2. Using the Subaru Select Monitor, compare the respective values between the followings: [VVT Adv. Ang. Amount R] and [VVT Advance Target Angle Amount R], [VVT Adv. Ang. Amount L] and [VVT Advance Target Angle Amount L], [Exh. VVT Retard Ang. R] and [Ex VVT Retard Target Angle R], [Exh. VVT Retard Ang. L] and [Ex VVT Retard Target Angle L].

   Does all of the advance angle amount and retard angle amount synchronize with their target values?

   Yes:  Go to  73.

   No:  Diagnose the part that does not synchronize.

   • Intake RH: Go to  57.
   • Intake LH: Go to  61.
   • Exhaust RH: Go to  65.
   • Exhaust LH: Go to  69.

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?

   Yes:  Go to  58.

   No:  Check the harnesses and connectors, and repair or replace them if necessary.

   NOTE: In this case, repair the following item:

   • Power supply circuit
   • Poor contact of coupling 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.

   Connector & terminal 

   (E158) No. 99 - (E38) No. 2:

   Is the resistance less than 1 Ω?

   Yes:  Go to  59.

   No:  Repair the open circuit in harness between ECM connector 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?

Yes:  Go to  60.

No:  Repair the short circuit to ground in harness between ECM connector and intake oil control solenoid RH connector.

Check the intake oil control solenoid RH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>OIL CONTROL SOLENOID>INSPECTION .

Is the check result OK?

Yes:  Replace the intake cam sprocket RH. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>CAM SPROCKET .

No:  Replace the intake oil control solenoid RH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>OIL CONTROL SOLENOID .

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?

   Yes:  Go to  62.

   No:  Check the harnesses and connectors, and repair or replace them if necessary.

   NOTE: In this case, repair the following item:

   • Power supply circuit
   • Poor contact of coupling 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.

   Connector & terminal 

   (E158) No. 100 - (E37) No. 2:

   Is the resistance less than 1 Ω?

   Yes:  Go to  63.

   No:  Repair the open circuit in harness between ECM connector 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?

Yes:  Go to  64.

No:  Repair the short circuit to ground in harness between ECM connector and intake oil control solenoid LH connector.

Check the intake oil control solenoid LH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>OIL CONTROL SOLENOID>INSPECTION .

Is the check result OK?

Yes:  Replace the intake cam sprocket LH. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>CAM SPROCKET .

No:  Replace the intake oil control solenoid LH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>OIL CONTROL SOLENOID .

1. Turn the ignition switch to OFF.
2. Disconnect the connector from the exhaust oil control solenoid RH.
3. Turn the ignition switch to ON.
4. Measure the voltage between exhaust oil control solenoid RH connector and engine ground.

   Connector & terminal 

   (E63) No. 1 (+) - Engine ground (-):

   Is the voltage 10 V or more?

   Yes:  Go to  66.

   No:  Check the harnesses and connectors, and repair or replace them if necessary.

   NOTE: In this case, repair the following item:

   • Power supply circuit
   • Poor contact of coupling connector

1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Measure the resistance of harness between ECM connector and exhaust oil control solenoid RH connector.

   Connector & terminal 

   (E158) No. 108 - (E63) No. 2:

   Is the resistance less than 1 Ω?

   Yes:  Go to  67.

   No:  Repair the open circuit in harness between ECM connector and exhaust oil control solenoid RH connector.

Measure the resistance between exhaust oil control solenoid RH connector and engine ground.

Connector & terminal 

(E63) No. 2 - Engine ground:

Is the resistance 1 MΩ or more?

Yes:  Go to  68.

No:  Repair the short circuit to ground in harness between ECM connector and exhaust oil control solenoid RH connector.

Check the exhaust oil control solenoid RH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>OIL CONTROL SOLENOID>INSPECTION .

Is the check result OK?

Yes:  Replace the exhaust cam sprocket RH. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>CAM SPROCKET .

No:  Replace the exhaust oil control solenoid RH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>OIL CONTROL SOLENOID .

1. Turn the ignition switch to OFF.
2. Disconnect the connector from the exhaust oil control solenoid LH.
3. Turn the ignition switch to ON.
4. Measure the voltage between exhaust oil control solenoid LH connector and engine ground.

   Connector & terminal 

   (E66) No. 1 (+) - Engine ground (-):

   Is the voltage 10 V or more?

   Yes:  Go to  70.

   No:  Check the harnesses and connectors, and repair or replace them if necessary.

   NOTE: In this case, repair the following item:

   • Power supply circuit
   • Poor contact of coupling connector

1. Turn the ignition switch to OFF.
2. Disconnect the connector from ECM.
3. Measure the resistance of harness between ECM connector and exhaust oil control solenoid LH connector.

   Connector & terminal 

   (E158) No. 109 - (E66) No. 2:

   Is the resistance less than 1 Ω?

   Yes:  Go to  71.

   No:  Repair the open circuit in harness between ECM connector and exhaust oil control solenoid LH connector.

Measure the resistance between exhaust oil control solenoid LH connector and engine ground.

Connector & terminal 

(E66) No. 2 - Engine ground:

Is the resistance 1 MΩ or more?

Yes:  Go to  72.

No:  Repair the short circuit to ground in harness between ECM connector and exhaust oil control solenoid LH connector.

Check the exhaust oil control solenoid LH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>OIL CONTROL SOLENOID>INSPECTION .

Is the check result OK?

Yes:  Replace the exhaust cam sprocket LH. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>CAM SPROCKET .

No:  Replace the exhaust oil control solenoid LH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>OIL CONTROL SOLENOID .

Check the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>ENGINE COOLANT TEMPERATURE SENSOR>INSPECTION .

Is the check result OK?

Yes:  Go to  74.

No:  Replace the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>ENGINE COOLANT TEMPERATURE SENSOR .

1. Turn the ignition switch to OFF.
2. Disconnect the connectors from ECM and engine coolant temperature sensor.
3. Measure the resistance of harness between ECM connector and engine coolant temperature sensor connector.

   Connector & terminal 

   (E158) No. 58 - (E8) No. 1:

   (E158) No. 55 - (E8) No. 2:

   Is the resistance less than 1 Ω?

   Yes:  Go to  75.

   No:  Repair the open circuit of the harness between the ECM connector and engine coolant temperature sensor connector.

Measure the resistance between the ECM connector and engine ground.

Connector & terminal 

(E158) No. 55 - Engine ground:

Is the resistance 1 MΩ or more?

Yes:  Go to  76.

No:  Repair the short circuit to ground in harness between ECM connector and engine coolant temperature sensor connector.

Check the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR>INSPECTION .

Is the check result OK?

Yes:  Go to  77.

No:  Replace the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR .

Check the manifold absolute pressure sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MANIFOLD ABSOLUTE PRESSURE SENSOR>INSPECTION .

Is the check result OK?

Yes:  Clear the memory to complete. Ref. to COMMON (DIAG)>CLEAR MEMORY .

No:  Check the manifold absolute pressure sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MANIFOLD ABSOLUTE PRESSURE SENSOR .

1. Turn the ignition switch to OFF.
2. Disconnect the connectors from ECM and fuel injectors.
3. Measure the resistance of harness between ECM connector and fuel injector connector.

   Connector & terminal 

   #1 (E158) No. 96 - (E5) No. 1:

   #1 (E158) No. 87 - (E5) No. 2:

   #2 (E158) No. 95 - (E16) No. 1:

   #2 (E158) No. 86 - (E16) No. 2:

   #3 (E158) No. 93 - (E6) No. 1:

   #3 (E158) No. 84 - (E6) No. 2:

   #4 (E158) No. 94 - (E17) No. 1:

   #4 (E158) No. 85 - (E17) No. 2:

   Is the resistance less than 1 Ω?

   Yes:  Go to  79.

   No:  Repair the open circuit of the harness between the ECM connector and fuel injector connector.

Measure the resistance between the ECM connector and engine ground.

Connector & terminal 

#1 (E158) No. 96 - Engine ground:

#1 (E158) No. 87 - Engine ground:

#2 (E158) No. 95 - Engine ground:

#2 (E158) No. 86 - Engine ground:

#3 (E158) No. 93 - Engine ground:

#3 (E158) No. 84 - Engine ground:

#4 (E158) No. 94 - Engine ground:

#4 (E158) No. 85 - Engine ground:

Is the resistance 1 MΩ or more?

Yes:  Go to  80.

No:  Repair the short circuit to ground in harness between ECM connector and fuel injector connector.

Check the ignition system. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>DIAGNOSTICS WITH PHENOMENON>IGNITION CONTROL SYSTEM .

Is the check result OK?

Yes:  Go to  81.

No:  Repair the ignition system. Ref. to ENGINE IGNITION SYSTEM .

Read all DTCs using the Subaru Select Monitor or a general scan tool. Ref. to COMMON (DIAG)>DIAGNOSTIC TROUBLE CODE (DTC) .

Is DTC of CVT displayed? (Current malfunction)

Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Ref. to P-HEV DRIVE MOTOR (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

Even i (DTC is detected, it has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

Using the Subaru Select Monitor, read the values in [Calculated load value] and [Relative Throttle Pos.].

Is the value of [Calculated load value] decreasing while that of [Relative Throttle Pos.] is increasing?

Yes:  Go to  83.

No:  Go to  87.

Check the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR>INSPECTION .

Is the check result OK?

Yes:  Go to  84.

No:  Replace the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR .

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. 32 - (B3) No. 1:

   (B134) No. 54 - (B3) No. 2:

   (B134) No. 53 - (B3) No. 3:

   (B134) No. 43 - (B3) No. 4:

   Is the resistance less than 1 Ω?

   Yes:  Go to  85.

   No:  Check the harnesses and connectors, and repair or replace them if necessary.

   NOTE: In this case, repair the following item:

   • Open circuit in harness between ECM connector and the mass air flow and intake air temperature sensor connector
   • Poor contact of J/C

Measure the resistance between the ECM connector and engine ground.

Connector & terminal 

(B134) No. 32 - Engine ground:

(B134) No. 53 - Engine ground:

(B134) No. 43 - Engine ground:

Is the resistance 1 MΩ or more?

Yes:  Go to  86.

No:  Repair the ground short circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.

1. Turn the ignition switch to ON.
2. Navigate to Inspection Mode for measuring Exhaust Gas. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>WORK SUPPORT>OPERATION>SERVICE MODE .
   NOTE: If it is necessary to run the engine for 10 minutes or more, fasten the driver's seat belt.
3. Start the engine and warm up completely.
4. Using the Subaru Select Monitor, read the value of [Calculated load value], then compare it with the value of [Calculated load value] listed in "Data Monitor".
   NOTE:

   • The value of Calculated load value changes 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 "Common (Diagnostics)". Ref. to COMMON (DIAG)>DATA MONITOR .

   Does the value of [Calculated load value] fall between 90 - 110[%] of the value described in the list?

   Yes:  Go to  87.

   No:  Replace the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR .

1. Turn the ignition switch to OFF.
2. Disconnect the connectors from ECM and fuel injectors.
3. Measure the resistance of harness between ECM connector and fuel injector connector.

   Connector & terminal 

   #1 (E158) No. 96 - (E5) No. 1:

   #1 (E158) No. 87 - (E5) No. 2:

   #2 (E158) No. 95 - (E16) No. 1:

   #2 (E158) No. 86 - (E16) No. 2:

   #3 (E158) No. 93 - (E6) No. 1:

   #3 (E158) No. 84 - (E6) No. 2:

   #4 (E158) No. 94 - (E17) No. 1:

   #4 (E158) No. 85 - (E17) No. 2:

   Is the resistance less than 1 Ω?

   Yes:  Go to  88.

   No:  Repair the open circuit of the harness between the ECM connector and fuel injector connector.

Measure the resistance between the ECM connector and engine ground.

Connector & terminal 

#1 (E158) No. 96 - Engine ground:

#1 (E158) No. 87 - Engine ground:

#2 (E158) No. 95 - Engine ground:

#2 (E158) No. 86 - Engine ground:

#3 (E158) No. 93 - Engine ground:

#3 (E158) No. 84 - Engine ground:

#4 (E158) No. 94 - Engine ground:

#4 (E158) No. 85 - Engine ground:

Is the resistance 1 MΩ or more?

Yes:  Go to  89.

No:  Repair the short circuit to ground in harness between ECM connector and fuel injector connector.

Check the ignition system. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>DIAGNOSTICS WITH PHENOMENON>IGNITION CONTROL SYSTEM .

Is the check result OK?

Yes:  Go to  90.

No:  Repair the ignition system. Ref. to ENGINE IGNITION SYSTEM .

1. On "Active Test" item, select [Fuel Pump Relay] and perform ON/OFF drive operation.
   NOTE: For detailed operation procedures, refer to the "Active Test". Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>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?

   Yes:  Go to  92.

   No:  Go to  91.

Check fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>FUEL PUMP>INSPECTION .

Is the check result OK?

Yes:  Check fuel pump system. Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>DIAGNOSTICS WITH PHENOMENON>FUEL PUMP CIRCUIT .

No:  Replace the fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>FUEL PUMP .

Check if any foreign matters such as iron powder exist in the fuel tank.

Is there any foreign matter in the fuel tank?

Yes:  Remove foreign matter from the fuel tank.

No:  Go to  93.

Measure the fuel pressure. Ref. to MECHANICAL (H4DO (EXCEPT FOR HEV))>FUEL PRESSURE>INSPECTION .

Is the measured value 350 - 450 kPa (3.5 - 4.6 kg/cm² , 50 - 66 psi)?

Yes:  Go to  94.

No:  Check the fuel pump and fuel delivery line. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>FUEL PUMP>INSPECTION . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>FUEL DELIVERY AND EVAPORATION LINES>INSPECTION .

Using the Subaru Select Monitor, read the values in [Fuel Rail Pressure A] and [Commanded Fuel Rail Pressure A].

Is the value in [Fuel Rail Pressure A] synchronized with the one in [Commanded Fuel Rail Pressure A] in all freeze frame data?

Yes:  Go to  95.

No:  Check the high-pressure fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (HEV))>HIGH PRESSURE FUEL PUMP>INSPECTION .

Check the engine running condition using "Roughness monitor" in the Subaru Select Monitor.

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 MECHANICAL (H4DO (EXCEPT FOR HEV))>SYMPTOMS AND CAUSES>INSPECTION .

Clear the memory to complete. Ref. to COMMON (DIAG)>CLEAR MEMORY .