DTC P0970: Pressure Control Solenoid "C" Control Circuit Low: Notes

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

Driveability getting worse.

Wiring diagram: 

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

Courtesy of SUBARU OF AMERICA, INC.

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

      Connector & terminal 

      (B54) No. 48 - Chassis ground:

   Is the resistance 1 MΩ or more?

   Yes:  Go to  2.

   No:  Repair the short circuit of harness.

2. CHECK AWD SOLENOID  .

   Measure the resistance between transmission connector and transmission body.

   Connector & terminal 

   (T19) No. 9 - Transmission body:

   Is the resistance approximately 3.3 - 7.3 Ω? (When cold)

   Yes:  Check for poor contact of connector, and if no fault is found, replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM) .

   No:  Go to  3.

3. CHECK HARNESS INSIDE TRANSMISSION  .
   CAUTION: Start work after ATF cools down.
   1. Remove the transmission oil pan.
   2. Check for the harness pinch, damage.

   Is the check result OK?

   Yes:  Go to  4.

   No:  Replace the transmission harness. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION HARNESS .

4. CHECK HARNESS INSIDE TRANSMISSION  .
   1. Disconnect the control valve body connector.
   2. Measure the resistance between transmission connector and transmission body.

      Connector & terminal 

      (T19) No. 9 - Transmission body:

   Is the resistance 1 MΩ or more?

   Yes:  Replace the control valve body. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CONTROL VALVE BODY .

   No:  Replace the transmission harness. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION HARNESS .