DTC P0951: Auto Shift Manual Control Circuit Range/Performance

1. - 

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

Manual mode cannot be set.

Wiring diagram: 

CVT control system Ref. to WIRING SYSTEM (CROSSTREK MODEL (EXCEPT FOR HEV))>CVT CONTROL SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK HARNESS  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the manual mode switch connector.
   3. Measure the resistance between manual mode switch connector and chassis ground.

   Connector & terminal 

   (i44) No. 8 - Chassis ground:

   Is the resistance less than 1 Ω?

   Yes  Go to  2.

   No  Repair the open circuit of harness.

2. CHECK MANUAL MODE SWITCH  .

   Measure the resistance between manual mode switch terminals.

   Terminals 

   No  . 7 - No. 8:

   Is the resistance 1 MΩ or more?

   Yes  Go to  3.

   No  Replace the select lever assembly. Ref. to CONTROL SYSTEMS>SELECT LEVER .

3. CHECK MANUAL MODE SWITCH  .
   1. Shift the select lever to manual mode.
   2. Measure the resistance between manual mode switch terminals.

   Terminals 

   No  . 7 - No. 8:

   Is the resistance less than 1 Ω?

   Yes  Go to  4.

   No  Replace the select lever assembly. Ref. to CONTROL SYSTEMS>SELECT LEVER .

4. CHECK HARNESS  .
   1. Disconnect the TCM connector.
   2. Measure the resistance between TCM connector and manual mode switch connector.

   Connector & terminal 

   (T10) No. 20 - (i44) No. 7:

   Is the resistance less than 1 Ω?

   Yes  Go to  5.

   No  Repair the open circuit of harness or poor contact of connector.

5. CHECK HARNESS  .

   Measure the resistance between manual mode switch connector and chassis ground.

   Connector & terminal 

   (i44) No. 7 - Chassis ground:

   Is the resistance 1 MΩ or more?

   Yes  Go to  6.

   No  Repair the short circuit of harness.

6. CHECK INPUT SIGNAL FOR TCM  .
   1. Connect all connectors.
   2. Turn the ignition switch to ON.
   3. Set the select lever to "D" range.
   4. Using the Subaru Select Monitor, read data of [Tiptronic Mode Switch] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (CROSSTREK MODEL)>DATA MONITOR .

   Does [Tiptronic Mode Switch] display [ON] with select lever in manual mode, and [OFF] with select lever in other than manual mode?

   Yes  Current condition is normal.

   No  Go to  7.

7. CHECK FOR POOR CONTACT  .

   Is there poor contact of the manual mode switch circuit?

   Yes  Repair the poor contact.

   No  Replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 CROSSTREK)>TRANSMISSION CONTROL MODULE (TCM) .