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.
  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.

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 and terminal. 

      (T19) No. 10 - Transmission body:

   Is the resistance approximately 4.8 - 5.8 Ω? (When cold)

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

   No:  Repair or replace the harness.