DTC P0705: Transmission Range Sensor "A" Circuit (PRNDL Input): 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.
  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.

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. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR .

   Is display "OFF" for the range other than corresponding range?

   Yes:  Go to  5.

   No:  Go to  2.

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

      Connector and terminal. 

      (B54) No. 38 - Chassis ground:

      (B54) No. 37 - Chassis ground:

      (B54) No. 36 - Chassis ground:

      (B54) No. 35 - Chassis ground:

   Is each resistance 1 MΩ or more?

   Yes:  Go to  3.

   No:  Repair the short circuit of body harness.

3. CHECK HARNESS. 
   1. Disconnect the inhibitor switch connector.
   2. Measure the resistance between transmission connector and chassis ground.

      Connector and terminal. 

      (T15) No. 4 - Chassis ground:

      (T15) No. 5 - Chassis ground:

      (T15) No. 9 - Chassis ground:

      (T15) No. 10 - Chassis ground:

   Is each resistance 1 MΩ or more?

   Yes:  Go to  4.

   No:  Repair the short circuit of transmission harness.

4. 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 other than corresponding range 1 MΩ or more?

   Yes:  Go to  5.

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

5. 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 (TR690)>TRANSMISSION CONTROL MODULE (TCM) .