DTC P0747: Pressure Control Solenoid "A" Stuck On: Notes

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Trouble symptom: 

• Acceleration is poor during standing start.
• Shift control malfunction

Wiring diagram: 

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

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC. 

   Read the DTC using Subaru Select Monitor.

   Besides DTC P0747, is any of the DTCs P0842, P0843, P0962 and P0963 displayed?

   Yes:  Perform the diagnosis according to DTCs other than P0747.

   No:  Go to  2.

2. CHECK SECONDARY SOLENOID (ACTIVE TEST). 
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor, perform forced operation of the secondary solenoid. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS)>ACTIVE TEST .

   Does the indication of 0 → 500 mA appear repeatedly during forced operation, and does operating sound emit during indicating 500 mA?

   Yes:  Go to  5.

   No:  Go to  3.

3. 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 

      (T4) No. 5 - Transmission body:

   Is the resistance approx. 5 - 7 Ω? (when cold)

   Yes:  Go to  7.

   No:  Go to  4.

4. CHECK HARNESS. 

   Check the transmission harness. (Open circuit, short circuit to power supply, short circuit to ground, and poor contact)

   Is the check result OK?

   Yes:  Go to  7.

   No:  Repair the harness.

5. CHECK TRANSMISSION FLUID. 
   1. Connect the transmission connector.
   2. Check the amount of ATF. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CVTF>ADJUSTMENT .

   Is the check result OK?

   Yes:  Go to  6.

   No:  Adjust the amount of ATF. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CVTF>ADJUSTMENT .

6. CHECK TRANSMISSION FLUID. 

   Check the condition of ATF. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CVTF>CONDITION CHECK .

   Is the check result OK?

   Yes:  Go to  7.

   No:  Check according to the "Corrective action" of ATF (CVTF) "CONDITION CHECK". Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CVTF>CONDITION CHECK .

7. CHECK INPUT SIGNAL FOR TCM. 
   1. Lift up the vehicle.
   2. Start the engine.
   3. Warm up until the ATF temperature reaches to 40 - 70°C (104 - 158°F).
   4. Depress the brake pedal, and shift the select lever to "D" range.
   5. Shift the select lever to "P" range.
   6. Stabilize the engine speed at idle.
   7. Read the data of «Actual Secondary Pressure» using Subaru Select Monitor.

   Is the «Actual Secondary Pressure» 0.5 - 1.5 MPa?

   Yes:  Go to  8.

   No:  Replace the control valve body. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CONTROL VALVE BODY .

8. CHECK INPUT SIGNAL FOR TCM. 
   1. Keep the engine speed at 3, 000 rpm.
   2. Read the data of «Actual Secondary Pressure» using Subaru Select Monitor.

   Is the «Actual Secondary Pressure» higher than step 7 value? Does the value change according to the engine speed, within the range of 1.5 - 2.5 MPa?

   Yes:  Go to  9.

   No:  Replace the control valve body. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CONTROL VALVE BODY .

9. CHECK TCM INPUT SIGNAL (STALL TEST). 
   1. Apply the parking brake.
   2. Set the select lever to "D" range.
   3. Depress the brake pedal firmly.
   4. Slowly open the accelerator fully, and stabilize the engine speed.
   5. Read the data of «Actual Secondary Pressure» using Subaru Select Monitor.
      CAUTION: Do not perform a stall test for over 5 seconds at a time.

   Is the «Actual Secondary Pressure» higher than step 8 value? Does the value change according to the engine speed, within the range of 4.5 - 6.0 MPa?

   Yes:  Go to  10.

   No:  Replace the control valve body. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CONTROL VALVE BODY .

10. DRIVING CHECK BY INSPECTION MODE. 
    1. Turn the ignition switch to OFF.
    2. Perform a drive check based on the "Inspection Mode". Refer to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS)>INSPECTION MODE .

    Does the AT OIL TEMP light blink and is DTC P0747 displayed?

    Yes:  Perform the secondary pressure test. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>SECONDARY PRESSURE (LINE PRESSURE) TEST .

    No:  Current condition is normal. It is possible that temporary poor contact occurs.