DTC P0708 At Range Switch Not Inputted: Notes

DTC DETECTING CONDITION: 

Immediately at fault recognition

TROUBLE SYMPTOM: 

• Shift characteristics are erroneous.
• The range position of the select lever and the position of shift indicator display do not match.

WIRING DIAGRAM: 

• Non-turbo model

  CVT control system Ref. to WIRING SYSTEM > CVT Control System >-->  CVT CONTROL SYSTEM  .

• Turbo model

  CVT control system Ref. to WIRING SYSTEM > CVT Control System >-->  TURBO MODEL  .

1. CHECK INPUT SIGNAL FOR TCM  .
   1. Turn the ignition switch to ON.
   2. Move the select lever to each range, read the data of [P Range], [R Range Signal], [N Range] and [D Range Signal] using the Subaru Select Monitor.

   Is the display of the corresponding range "ON"? 

   Yes: Go to  7.

   No: Go to  2.

2. CHECK HARNESS  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the TCM and transmission connectors.
   3. Measure the resistance of harness between TCM connector and transmission connector.

      Connector & terminal 

      Non-turbo model 

      (B54) No. 38 - (B12) No. 1:

      (B54) No. 37 - (B12) No. 2:

      (B54) No. 36 - (B12) No. 3:

      (B54) No. 35 - (B12) No. 4:

      Turbo model 

      (B54) No. 38 - (B12) No. 3:

      (B54) No. 37 - (B12) No. 2:

      (B54) No. 36 - (B12) No. 1:

      (B54) No. 35 - (B12) No. 8:

   Is each resistance less than 1 Ω?

   Yes: Go to  3.

   No: Repair the open circuit of body harness.

3. CHECK HARNESS  .

   Measure the resistance of harness between inhibitor switch connector and transmission ground.

   Connector & terminal 

   (T7) No. 1 - Transmission ground:

   Is the resistance less than 1 Ω?

   Yes: Go to  4.

   No: Repair the open circuit of harness.

4. CHECK HARNESS  .
   1. Disconnect the inhibitor switch connector.
   2. Measure the resistance between transmission connector and inhibitor switch connector.

      Connector & terminal 

      Non-turbo model 

      (T3) No. 1 - (T7) No. 2:

      (T3) No. 2 - (T7) No. 5:

      (T3) No. 3 - (T7) No. 3:

      (T3) No. 4 - (T7) No. 4:

      Turbo model 

      (T3) No. 3 - (T7) No. 2:

      (T3) No. 2 - (T7) No. 5:

      (T3) No. 1 - (T7) No. 3:

      (T3) No. 8 - (T7) No. 4:

   Is each resistance less than 1 Ω?

   Yes: Go to  5.

   No: Repair the open circuit of transmission harness.

5. CHECK INHIBITOR SWITCH  .

   Move the select lever to each range, and measure the resistance between inhibitor switch terminals.

   Terminals 

   No. 2 - No. 1:

   No. 5 - No. 1:

   No. 3 - No. 1:

   No. 4 - No. 1:

   Is the resistance of the corresponding range less than 1 Ω?

   Yes: Go to  6.

   No: Replace the inhibitor switch. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580) >-->  INHIBITOR SWITCH  . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690) >-->  INHIBITOR SWITCH  .

6. CHECK HARNESS  .
   1. Turn the ignition switch to ON.
   2. Measure the voltage between each connector and chassis ground.

      Connector & terminal 

      Transmission connector (B12 side) 

      Non-turbo model 

      (B12) No. 1 (+) - Chassis ground (-):

      (B12) No. 2 (+) - Chassis ground (-):

      (B12) No. 3 (+) - Chassis ground (-):

      (B12) No. 4 (+) - Chassis ground (-):

      Turbo model 

      (B12) No. 3 (+) - Chassis ground (-):

      (B12) No. 2 (+) - Chassis ground (-):

      (B12) No. 1 (+) - Chassis ground (-):

      (B12) No. 8 (+) - Chassis ground (-):

      Transmission connector (T7 side) 

      (T7) No. 2 (+) - Chassis ground(-):

      (T7) No. 5 (+) - Chassis ground(-):

      (T7) No. 3 (+) - Chassis ground(-):

      (T7) No. 4 (+) - Chassis ground(-):

   Is each voltage less than 1 V? 

   Yes: Go to  7.

   No: Repair the harness which outputs 1 V or more.

7. CHECK FOR POOR CONTACT  .

   Is there poor contact between TCM, inhibitor switch, transmission ground?

   Yes: Repair the poor contact.

   No: Replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580) >-->  TRANSMISSION CONTROL MODULE (TCM)  . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690) >-->  TRANSMISSION CONTROL MODULE (TCM)  .