DTC P0512: Starter (Switch) Request Circuit: Notes

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

Failure of engine to start

Wiring diagram: 

Engine Electrical System Refer to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK PUSH BUTTON IGNITION SWITCH. 

   Operate the push button ignition switch.

   Does it operate smoothly without catch?

   Yes:  Go to  2.

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

2. CHECK DTC. 
   1. Clear the memory using the Subaru Select Monitor or general scan tool. Refer to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>CLEAR MEMORY MODE .
   2. Start and idle the engine for three minutes or more.

   Is DTC P0512 output? (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.

   NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
3. CHECK HARNESS BETWEEN ECM AND KEYLESS ACCESS CM. 
   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 engine ground.

      Connector & terminal 

      (B134) No. 45 (+) - Engine ground (-):

   Is the voltage 10 V or more?

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

   No:  Repair the poor contact of ECM connector.