DTC P2728: Pressure Control Solenoid "E" Control Circuit Range/Performance: Notes

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

• Acceleration is poor during standing start.
• Shift control malfunction
• Engine speed increases abruptly.

Wiring diagram: 

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

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .

   Read the DTC using Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC) .

   Besides DTC P2728, is DTC P2729 or P2730 displayed?

   Yes  : Perform the diagnosis according to DTCs other than P2728. Ref. to TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST .

   No  : Go to  2.

2. CHECK SECONDARY SOLENOID (ACTIVE TEST)  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor, perform the active test for secondary solenoid. Ref. to TRANSMISSION (DIAGNOSTICS)>ACTIVE TEST .

   Is 300 → 500 → 700 mA indicated at the active test, and does [Secondary Actual Current] follow [Secondary Set Current]?

   Yes  : Go to  3.

   No  : Go to  4.

3. CHECK FOR POOR CONTACT  .

   Check for poor contact of harness and connector between TCM and secondary solenoid.

   Is there poor contact?

   Yes  : Repair the poor contact of harness and connector.

   No  : Recheck the poor contact of harness and connector. Replace the TCM if no fault is found. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM) .

4. CHECK SECONDARY SOLENOID  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the transmission connector.
   3. Measure the resistance between transmission connector and transmission body.

      Connector & terminal 

      (T19) No. 10 - Transmission body:

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

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

   No  : Repair or replace the harness.