ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0512 STARTER REQUEST CIRCUIT

1. MODEL WITHOUT PUSH BUTTON START

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM:

Failure of engine to start

CAUTION:

After repairing or replacing the defective part, perform the Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

• LHD model

• RHD model

STEPCHECKYESNO

1.CHECK FOR ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Check the appropriate DTC using the “List of Diagnostic Trouble Code (DTC)”.

2.CHECK HARNESS BETWEEN ECM AND IGNITION SWITCH.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from the ECM.

3) Turn the ignition switch to ON.

4) Measure the voltage between ECM and chassis ground.

Connector & terminal

(B136) No. 34 (+) — Chassis ground (−):

Is the voltage 10 V or more?

Repair the short circuit to power in the harness between ECM and ignition switch.

Repair the poor contact of the ECM connector.

2. MODEL WITH PUSH BUTTON START

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM:

Failure of engine to start

CAUTION:

After repairing or replacing the defective part, perform the Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

• LHD model

• RHD model

STEPCHECKYESNO

1.CHECK PUSH BUTTON IGNITION SWITCH.

Operate the push button ignition switch.

Does it operate smoothly without catch?

Replace the push button ignition switch.

2.CHECK DTC.

1) Clear the memory using the Subaru Select Monitor.

NOTE:

For detailed procedures, refer to “Clear Memory Mode”.

2) Start and idle the engine for more than three minutes.

Is the same DTC as current diagnosis output?

The circuit has returned to a normal condition at this time. Reproduce the fault condition, and reperform the check.

3.CHECK HARNESS BETWEEN ECM AND POWER SUPPLY CM.

1) Turn the ignition to OFF.

2) Disconnect the connectors from the ECM.

3) Turn the ignition to ON.

4) Measure the voltage between ECM and chassis ground.

Connector & terminal

(B136) No. 34 (+) — Chassis ground (−):

Is the voltage 10 V or more?

Repair the short circuit to power supply in harness between ECM and power supply CM.

Repair the poor contact of the ECM connector.