DTC P0951: Auto Shift Manual Control Circuit Range/Performance: Notes

-
DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Manual mode can not be set.

Wiring diagram:

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

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
  
  (i44) 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
  
  (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.
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.
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. Read the data of [Tiptronic Mode Switch] using Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>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.
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) .