Model With Push Button Start

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

Failure of engine to start

Wiring diagram: 

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

• IMPREZA MODEL

  Courtesy of SUBARU OF AMERICA, INC.

  Courtesy of SUBARU OF AMERICA, INC.

• CROSSTREK MODEL

  Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK PUSH BUTTON IGNITION SWITCH  .

   Check the push button ignition switch. Ref. to SECURITY AND LOCKS>PUSH BUTTON IGNITION SWITCH>INSPECTION .

   Is the check result OK?

   Yes:  Go to  2.

   No:  Replace the push button ignition switch. Ref. to SECURITY AND LOCKS>PUSH BUTTON IGNITION SWITCH .

2. CHECK DTC  .
   1. Using the Subaru Select Monitor or a general scan tool, perform the clear memory of [Engine]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
   2. Start and idle the engine for three minutes or more.
   3. 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 P0512 displayed? (Current malfunction)

   Yes:  Go to  3.

   No:  Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

3. CHECK HARNESS BETWEEN ECM AND KEYLESS ACCESS CONTROL MODULE (SHORT TO POWER SUPPLY)  .
   1. Turn the ignition to OFF.
   2. Disconnect the connector from ECM.
   3. Turn the ignition to ON.
   4. Measure the voltage between ECM connector and chassis ground.

      Connector and terminal 

      (B134) No. 25 (+) - Chassis ground (-):

   Is the voltage 10 V or more?

   Yes:  Repair the short circuit to power supply in harness between ECM connector and keyless access control module connector.

   No:  Repair the poor contact of ECM connector.