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 Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM .

Fig 1: Starter (Switch) Request Circuit - 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. Ref. to SECURITY AND LOCKS>Push Button Ignition Switch .
2. CHECK DTC  .
   1. Clear the memory using the Subaru Select Monitor. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode .
   2. Start and idle the engine for three minutes or more.

   Is the same DTC as current diagnosis output?

   • 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.
     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 chassis ground.

   Connector & terminal 

   (B134) No. 46 (+) - 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 CM.
   • No: Repair the poor contact of ECM connector.