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 & 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 & terminal

(T19) No. 12 - Transmission body:

Is the resistance approximately 3.5 - 7.1 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 & 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.