DTC P0512: Starter (Switch) Request Circuit: Notes

1. - 

DTC detecting condition: 

Detected when three consecutive driving cycles with fault occur.

Trouble symptom: 

Auto Start Stop does not operate.

Wiring diagram: 

• ENGINE TYPE FB

Auto Start Stop Ref. to WIRING SYSTEM>AUTO START STOP>WIRING DIAGRAM>ENGINE TYPE FB .

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• ENGINE TYPE FA

Auto Start Stop Ref. to WIRING SYSTEM>AUTO START STOP>WIRING DIAGRAM>ENGINE TYPE FA .

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1. CHECK DATA MONITOR  .
   1. Turn the ignition switch to ON. (Engine OFF)
   2. Read the data of [Starter Switch] using Subaru Select Monitor. Ref. to AUTO START STOP (DIAGNOSTICS)>DATA MONITOR .

   Is [ON] displayed in [Starter Switch]?

   Yes:  Go to  2 .

   No:  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.
2. CHECK INPUT VOLTAGE OF TCM  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the TCM connector.
   3. Turn the ignition switch to ON.
   4. Measure the voltage between TCM and chassis ground.

      Connector and terminal 

      ENGINE TYPE FB

      (T21) No. 45 (+) - Chassis ground (-):

      ENGINE TYPE FA

      (B67) No. 45 (+) - Chassis ground (-):

   Is the voltage 10 V or more?

   Yes:  Check the following item and repair if necessary.

   • Model with push button start

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

   • Model without push button start

   Short circuit to power supply in harness between ignition switch and TCM connector

   Sticking inside the ignition switch

   No:  Check for poor contact of TCM connector. Replace the TCM if no fault is found. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSMISSION CONTROL MODULE (TCM) . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM) .