DTC P0512: Starter (Switch) Request Circuit: Notes

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

Failure of engine to start

• Model without push button start

  Wiring diagram: 

  Engine Electrical System Ref. to WIRING SYSTEM (CROSSTREK MODEL)>Engine Electrical System>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

1. 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 .

      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 ENGINE (DIAGNOSTICS) (H4DO)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Data Monitor 

      Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC P0512 displayed? (Current malfunction)

   Yes:  Go to  2.

   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. In this case, a malfunction may be detected by continuously holding the ignition key at START position.

2. CHECK HARNESS BETWEEN ECM AND IGNITION SWITCH (SHORT TO POWER SUPPLY)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from ECM.
   3. Turn the ignition switch to ON.
   4. Measure the voltage between ECM connector and engine ground.

      Connector & terminal 

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

   Is the voltage 10 V or more?

   Yes:  Repair the short circuit to power supply in harness between ECM connector and ignition switch connector.

   No:  Repair the poor contact of ECM connector.

• Model with push button start

  Wiring diagram: 

  Engine Electrical System Ref. to WIRING SYSTEM (CROSSTREK MODEL)>Engine Electrical System>WIRING DIAGRAM .

  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 .

      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 ENGINE (DIAGNOSTICS) (H4DO)>DIAGNOSTIC TROUBLE CODE (DTC) .

      DTC Check 

      Ref. to ENGINE (DIAGNOSTICS) (H4DO)>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 & 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.