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Home >> Subaru >> 2019 >> WRX STI Limited >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Security And Locks - Keyless Access (W/Push Button Start) (Diagnostics) >> Diagnostics With Phenomenon >> Inspection >> Engine Does Not Start

Engine Does Not Start

Trouble causes: 

CAUTION:
  • When the keyless access control module is replaced with a new unit, and the battery ground terminal is connected, it will become ignition ON. Also, if the battery is disconnected, it will resume to a condition with the battery cut off.
  • For replacement procedure of keyless access control module, refer to the "REGISTRATION INSTRUCTIONS FOR IMMOBILIZER" provided as a separate volume.
  • Before performing diagnosis, refer to "CAUTION" in "General Description". Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .
  1. INITIALIZE STEERING LOCK. 
    1. Shift the shift lever to parking (CVT model) or neutral (MT model).
    2. Operate the driver's door switch ON/OFF with the ignition switch OFF.
    3. Wait for 10 seconds.
    4. Place the access key on the driver's seat.
    5. With depressing the brake pedal (CVT model) or clutch pedal (MT model), push the push button ignition switch.

      Can the engine start?

      Yes:  The circuit 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.

      No:  Go to  2.

  2. CHECK DTC. 

    Read DTCs of «Keyless Access with Push Button Start» using the Subaru Select Monitor. Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are any DTCs displayed? (Current malfunction)

    Yes:  Perform the diagnosis for the displayed DTCs. Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

    No:  Go to  3.

  3. CHECK POWER SUPPLY SWITCHING. 
    1. Place the access key on the driver's seat.
    2. Without depressing the brake pedal (CVT model) or clutch pedal (MT model), push the push button ignition switch.

      When the switch is operated, does the <IG-OFF>→ <ACC-ON>→ <IG-ON>→ <IG-OFF>change occur?

      Yes:  Go to  4.

      No:  Perform the diagnostics according to the symptom for power supply switching system in General Diagnostic Table. Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DIAGNOSTICS WITH PHENOMENON>LIST>POWER SUPPLY SWITCHING SYSTEM .

  4. CHECK DATA MONITOR. 
    1. Place the access key on the driver's seat.
    2. With depressing the brake pedal (CVT model) or clutch pedal (MT model), push the push button ignition switch.
    3. Using the Subaru Select Monitor, check the following items on «Data monitor» of «Keyless Access with Push Button Start», when pressing the push button ignition switch. Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DATA MONITOR .
      • «STSW signal monitor»
      NOTE: If it is difficult to confirm, press the push button ignition switch for approximately five seconds longer.

      Does the data change from OFF → ON?

      Yes:  Go to  11.

      No:  CVT model: Go to  5.

      MT model: Go to  8.

  5. CHECK DATA MONITOR. 

    Using the Subaru Select Monitor, check the following items on «Data monitor» of «Keyless Access with Push Button Start». Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DATA MONITOR .

    • «Shift P signal (AT only)»

    Is «ON» displayed in parking position, and «OFF» displayed in other positions?

    Yes:  Go to  6.

    No:  Go to  12.

  6. CHECK DATA MONITOR. 

    Using the Subaru Select Monitor, check the following items on «Data monitor» of «Keyless Access with Push Button Start». Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DATA MONITOR .

    • «Stop light SW»

    Is «ON» displayed when brake pedal depressed, and «OFF» displayed when brake pedal not depressed?

    Yes:  Go to  7.

    No:  Go to  14.

  7. CHECK DATA MONITOR. 

    Using the Subaru Select Monitor, check the following items on «Data monitor» of «Keyless Access with Push Button Start». Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DATA MONITOR .

    • «Shift N signal (AT only)»

    Is «ON» displayed in parking and neutral positions, and «OFF» displayed in other positions?

    Yes:  Go to  9.

    No:  Go to  16.

  8. CHECK DATA MONITOR. 

    Using the Subaru Select Monitor, check the following items on «Data monitor» of «Keyless Access with Push Button Start». Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DATA MONITOR .

    • «Clutch SW (MT only»

    Is «ON» displayed when clutch pedal is depressed, and «OFF» displayed when clutch pedal is not depressed?

    Yes:  Go to  9.

    No:  Go to  17.

  9. CHECK STEERING LOCK. 

    Operate the push button ignition switch to perform the power supply switching and check steering lock condition during ACC-ON condition.

    Is the steering lock in unlocked condition?

    Yes:  Go to  10.

    No:  Perform the diagnostics according to the symptom for steering lock system in General Diagnostic Table. Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DIAGNOSTICS WITH PHENOMENON>LIST>STEERING LOCK SYSTEM .

  10. CHECK KEYLESS ACCESS control module. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the ECM connector.
    3. Using a tester, measure the voltage between the keyless access control module connector and chassis ground in the following procedures.
    4. While depressing the brake pedal (CVT model) or clutch pedal (MT model), push the push button ignition switch. (Measure within 10 seconds.)
    5. Release the push button ignition switch from the condition of step 1. above.

      Connector & terminal 

      (B573) No. 23 (+) - Chassis ground (-):

      Does the value change from 1 V or less to +B-2 V or more in the step 1, and return to 1 V or less in the step 2?

      Yes:  Perform the diagnosis for engine system. Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>DIAGNOSTICS FOR ENGINE STARTING FAILURE>PROCEDURE . Refer to ENGINE (DIAGNOSTICS) (STI)>DIAGNOSTICS FOR ENGINE STARTING FAILURE>PROCEDURE .

      No:  Replace the keyless access control module. Refer to SECURITY AND LOCKS>KEYLESS ACCESS control module .

  11. CHECK DATA MONITOR. 
    1. Connect the disconnected connectors.
    2. Using the Subaru Select Monitor, check the following items on «Data monitor» of «Keyless Access with Push Button Start». Refer to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>DATA MONITOR .
      • «Engine start permission request reception status»

      Is "Reception" displayed with ignition switch ON, and "Not yet received" displayed in other positions?

      Yes:  Perform the diagnosis for engine system. Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>DIAGNOSTICS FOR ENGINE STARTING FAILURE>PROCEDURE . Refer to ENGINE (DIAGNOSTICS) (STI)>DIAGNOSTICS FOR ENGINE STARTING FAILURE>PROCEDURE .

      No:  Replace the keyless access control module. Refer to SECURITY AND LOCKS>KEYLESS ACCESS control module .

  12. CHECK "P" RANGE SWITCH. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the AT shift lever connector.
    3. Using a tester, check the continuity of P range switch.

      Terminals 

      No. 1-2:

      Does it change from Continuity ←→ No continuity according to shift lever operation?

      Yes:  Go to  13.

      No:  Replace the "P" range switch. Refer to CONTROL SYSTEMS>AT SHIFT LOCK SOLENOID AND "P" RANGE SWITCH .

  13. CHECK HARNESS (OPEN CIRCUIT). 
    1. Turn the ignition switch to OFF.
    2. Disconnect the keyless access control module connector.
    3. Using a tester, check continuity between the keyless access control module connector and the AT select lever connector, and between the AT select lever connector and chassis ground.

      Connector & terminal 

      (B116) No. 1 - (B574) No. 18:

      (B116) No. 2 - Chassis ground:

      Is there continuity?

      Yes:  Replace the keyless access control module. Refer to SECURITY AND LOCKS>KEYLESS ACCESS control module .

      No:  Repair or replace the harness.

  14. CHECK STOP LIGHT SWITCH. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the stop light switch connector.
    3. Using a tester, check continuity of the stop light switch connector.

      Terminals 

      No. 1 - No. 2:

      Does it change from Continuity ←→ No continuity according to brake pedal operation?

      Yes:  Go to  15.

      No:  Replace the stop light switch. Refer to BRAKE>STOP LIGHT SWITCH .

  15. CHECK HARNESS (OPEN CIRCUIT). 
    1. Turn the ignition switch to OFF.
    2. Using a tester, check continuity between the keyless access control module connector and the stop light switch connector, and between the stop light switch connector and fuse.

      Connector & terminal 

      (B574) No. 27 - (B65) No. 2:

      (B65) No. 1 - F/B fuse No. 8:

      Is there continuity?

      Yes:  Replace the keyless access control module. Refer to SECURITY AND LOCKS>KEYLESS ACCESS control module .

      No:  Repair or replace the harness.

  16. CHECK INHIBITOR SWITCH. 

    Check the inhibitor switch. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>INHIBITOR SWITCH>INSPECTION .

    Is the check result OK?

    Yes:  Replace the keyless access control module. Refer to SECURITY AND LOCKS>KEYLESS ACCESS control module .

    No:  Replace the inhibitor switch. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>INHIBITOR SWITCH .

  17. CHECK CLUTCH SWITCH. 

    Check the clutch switch. Refer to CLUTCH SYSTEM>CLUTCH SWITCH>INSPECTION .

    Is the check result OK?

    Yes:  Go to  18.

    No:  Replace the clutch switch. Refer to CLUTCH SYSTEM>CLUTCH SWITCH>REMOVAL .

  18. CHECK HARNESS. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the clutch switch connector.
    3. Using a tester, check continuity between the keyless access control module connector and clutch switch connector.

      Connector & terminal 

      (B573) No. 14 - (B106) No. 2:

      (B106) No. 1 - F/B fuse No. 21:

      Is there continuity?

      Yes:  Replace the keyless access control module. Refer to SECURITY AND LOCKS>KEYLESS ACCESS control module .

      No:  Repair or replace the harness.

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