At Model

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Trouble symptom: 

Improper idling

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK SELECT LEVER ROD  .

   Check the select lever rod. Ref. to CONTROL SYSTEMS>SELECT LEVER ROD>INSPECTION .

   Is there any fault in the select lever rod?

   Yes:  Repair or adjust the select lever rod. Ref. to CONTROL SYSTEMS>SELECT LEVER ROD . Ref. to CONTROL SYSTEMS>SELECT LEVER .

   No:  Go to  2.

2. CHECK INPUT SIGNAL OF ECM  .
   1. Turn the ignition switch to ON.
   2. Place the select lever in a position other than "P" range or "N" range.
   3. Measure the voltage between ECM connector and engine ground.

      Connector & terminal 

      (B62) No. 39 (+) - Engine ground (-):

   Is the voltage 10 V or more?

   Yes:  Repair the poor contact of ECM connector.

   No:  Go to  3.

3. CHECK HARNESS BETWEEN ECM AND TRANSMISSION HARNESS (SHORT TO GROUND)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from ECM.
   3. Disconnect the connector from inhibitor switch.
   4. Measure the resistance between the ECM connector and engine ground.

      Connector & terminal 

      (B62) No. 39 - Engine ground:

   Is the resistance 1 MΩ or more?

   Yes:  Replace the inhibitor switch. Ref. to AUTOMATIC TRANSMISSION>INHIBITOR SWITCH .

   No:  Repair the short circuit to ground in harness between ECM connector and inhibitor switch connector.