DTC P2721: Pressure Control Solenoid "D" Control Circuit High: Notes

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Shift control malfunction
CVT chain slippage

CAUTION:

Use the 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 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 transmission connectors.
  Connector & terminal
  
  (B54) No. 31 - (E42) No. 5:
  
  Is the resistance less than 1 Ω?
  
  Yes : Go to 2.
  
  No : Repair the open circuit of harness.
CHECK HARNESS .
1. Turn the ignition switch to ON.
2. Measure the voltage between TCM connector and chassis ground.
  Connector & terminal
  
  (B54) No. 31 (+) - Chassis ground (-):
  
  Is the voltage approx. 0 V?
  
  Yes : Go to 3.
  
  No : Repair the short circuit of harness.
CHECK OIL PUMP ON/OFF SOLENOID .
Measure the resistance between transmission connector and transmission body.

Connector & terminal

(T19) No. 5 - Transmission body:

Is the resistance approximately 12.5 - 19.5 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. Turn the ignition switch to ON.
3. Measure the voltage between transmission connector and transmission body.
  Connector & terminal
  
  (T19) No. 5 (+) - Transmission body (-):
  
  Is the voltage approx. 0 V?
  
  Yes : Replace the control valve body. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CONTROL VALVE BODY .
  
  No : Replace the transmission harness.