DTC P0951: Auto Shift Manual Control Circuit Range/Performance

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Manual mode cannot be set.

Failure detection pattern:

"Primary" (high-priority diagnosis)

Warning light/indicator light:

Malfunction indicator light -
AT OIL TEMP light (blinking)

Wiring diagram:

CVT control system Ref. to WIRING SYSTEM>CVT CONTROL SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION:

Use CHECK BOARD when measuring the TCM terminal voltage and resistance.
After servicing or replacing faulty parts, perform the last step of the basic diagnostic procedure. Ref. to TRANSMISSION (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

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
  
  (i136) No. 8 - Chassis ground:
Is the resistance less than 1 Ω?

Yes: GO TO 2.

No: Repair the open circuit of harness.
CHECK MANUAL MODE SWITCH .
Measure the resistance between manual mode switch terminals.

Connector & terminal

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 .
CHECK MANUAL MODE SWITCH .
1. Shift the select lever to manual mode.
2. Measure the resistance between manual mode switch terminals.
  Connector & terminal
  
  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 .
CHECK HARNESS .
1. Disconnect the TCM connector.
2. Measure the resistance between TCM connector and manual mode switch connector.
  Connector & terminal
  
  (T21) No. 20 - (i136) 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.
CHECK HARNESS .
Measure the resistance between manual mode switch connector and chassis ground.

Connector & terminal

(i136) No. 7 - Chassis ground:

Is the resistance 1 MΩ or more?

Yes: GO TO 6.

No: Repair the short circuit of harness.
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 [Manual Mode Switch] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR .
Does [Manual 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.
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)>TRANSMISSION CONTROL MODULE (TCM) .