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.

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 .

Wiring diagram:

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

Courtesy of SUBARU OF AMERICA, INC.

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 and 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.

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 .
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 .
CHECK HARNESS .
1. Disconnect the TCM connector.
2. Measure the resistance between TCM connector and manual mode switch connector.
  Connector and terminal
  
  (B54) 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 and 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 (TR690)>TRANSMISSION CONTROL MODULE (TCM) .