DTC P0966: Pressure Control Solenoid "B" Control Circuit Low: Notes

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

Excessive shift shock

Wiring diagram: 

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

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK F&R SOLENOID (WHEN COLD: ATF TEMPERATURE APPROX. 20°C). 
   1. Check that the data of «ATF Temp.» indicates 20°C using the Subaru Select Monitor.
   2. Turn the ignition switch to OFF.
   3. Disconnect the TCM connector.
   4. Measure the resistance between TCM connector and transmission body.

   Connector & terminal

   (B54) No. 16 - Transmission body:

   Is the resistance approximately 4 - 6 Ω?

   Yes: Go to  2.

   No: Go to  3.

2. CHECK F&R SOLENOID (WHEN WARMED UP: ATF TEMPERATURE APPROX. 80°C OR MORE). 
   1. Connect the TCM connector.
   2. Warm up the engine until the data of «ATF Temp.» indicates 80°C or more using the Subaru Select Monitor.
   3. Turn the ignition switch to OFF.
   4. Disconnect the TCM connector.
   5. Measure the resistance between TCM connector and transmission body.

   Connector & terminal

   (B54) No. 16 - Transmission body:

   NOTE: When the temperature rises, the resistance value also increases.

   Is the resistance the same as the measured value in step 1 or less?

   Yes: Go to  3.

   No: Check for poor contact of connector, and if no fault is found, replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .

3. CHECK HARNESS (GROUND SHORT CIRCUIT). 
   1. Disconnect the transmission connector. (B11, T4)
   2. Measure the resistance between TCM connector and chassis ground.

   Connector & terminal 

   (B54) No. 16 - Chassis ground:

   Is the resistance 1 MΩ or more?

   Yes: Go to  4.

   No: Repair or replace the harness.

4. 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  5.

   No: Replace the transmission harness.

5. CHECK TRANSMISSION HARNESS (GROUND SHORT CIRCUIT). 
   1. Disconnect the control valve body connector.
   2. Measure the resistance between transmission connector and transmission body.

      Connector & terminal 

      (T4) No. 9 - Chassis ground:

   Is the resistance 1 MΩ or more?

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

   No: Replace the transmission harness.