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

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Excessive shift shock

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 INPUT SIGNAL FOR TCM.
1. After driving with warm up condition, park the vehicle while depressing the brake pedal at "D" range.
2. Using Subaru Select Monitor, read the data of [Commanded Forward & Reverse Linear Solenoid Current] and [Actual Forward & Reverse Linear Solenoid Current]. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR .
Do [Commanded Forward & Reverse Linear Solenoid Current] and [Actual Forward & Reverse Linear Solenoid Current] almost match?

Yes: Check for poor contact of connector.

No: Go to 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. 16 - Chassis ground:
Is the resistance 1 MΩ or more?

Yes: Go to 3.

No: Repair the short circuit of harness.
CHECK F & R SOLENOID.
Measure the resistance between transmission connector and transmission body.

Connector and terminal.

(T19) No. 12 - Transmission body:

Is the resistance approximately 4 - 6 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 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.
CHECK HARNESS INSIDE TRANSMISSION.
1. Disconnect the control valve body connector.
2. Measure the resistance between transmission connector and transmission body.
  Connector and terminal.
  
  (T19) No. 12 - 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.