CVT 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 (IMPREZA MODEL)>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM . Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>ENGINE ELECTRICAL SYSTEM>WIRING DIAGRAM .

• IMPREZA MODEL

Courtesy of SUBARU OF AMERICA, INC.

• CROSSTREK MODEL

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK SELECT CABLE  .

   Check the select cable.

   Is there any fault in select cable?

   Yes:  Repair or adjust the select cable. Ref. to CONTROL SYSTEMS>SELECT CABLE .

   No:  Go to  2.

2. CHECK INPUT SIGNAL OF ECM  .
   1. Turn the ignition switch to ON.
   2. Measure the voltage between ECM and chassis ground with select lever at "P" range and "N" range.

   Connector and terminal 

   (B134) No. 39 (+) - Chassis ground (-):

   Is the voltage less than 1 V?

   Yes:  Repair the poor contact of ECM connector.

   No:  Go to  3.

3. CHECK HARNESS BETWEEN ECM AND INHIBITOR SWITCH (OPEN)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the connector from ECM.
   3. Disconnect the connector from inhibitor switch.
   4. Measure the resistance of harness between ECM connector and inhibitor switch connector.

   Connector and terminal 

   IMPREZA MODEL 

   (B134) No. 39 - (T7) No. 6:

   (B134) No. 50 - (T7) No. 9:

   CROSSTREK MODEL 

   (B134) No. 39 - (T7) No. 5:

   (B134) No. 50 - (T7) No. 4:

   Is the resistance less than 1 Ω?

   Yes:  Replace the inhibitor switch. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>INHIBITOR SWITCH . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>INHIBITOR SWITCH .

   No:  Repair the harness and connector.

   NOTE: In this case, repair the following item:

   • Open circuit in harness between ECM connector and inhibitor switch connector
   • Poor contact of coupling connector