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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Transaxle (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0756 Shift Solenoid "B" Performance/Stuck Off >> Notes

DTC P0756 Shift Solenoid "B" Performance/Stuck Off: Notes

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Trouble symptom: 

Wiring diagram: 

Fig 2: Shift Solenoid (B) Performance/Stuck OFF System Wiring Diagram (Turbo Model)
G10410202Courtesy of SUBARU OF AMERICA, INC.
  1. CHECK DTC. 

    Read the DTC using Subaru Select Monitor.

    Besides DTC P0756, is any of the DTCs P0973, P0974, P0976, P0977, P2747 and P2751 displayed?

    • Yes  : Perform the diagnosis according to DTCs other than P0756.
    • No  : Go to 2. 
  2. CHECK PRIMARY DOWN SOLENOID (ACTIVE TEST). 
    1. Turn the ignition switch to ON.
    2. Using the Subaru Select Monitor, perform forced operation of the primary DOWN solenoid. Ref. to TRANSMISSION (DIAGNOSTICS)>Active Test .

    Does the indication of 0 → 50% appear repeatedly during forced operation, and does operating sound emit during indicating 50%?

    • Yes  : Go to  5.
    • No  : Go to 3. 
  3. CHECK PRIMARY DOWN 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 

      Non-turbo model 

      (T4) No. 3 - Transmission body:

      Turbo model 

      (T4) No. 1 - Transmission body:

    Is the resistance approximately 10 - 13.5 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. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>CVTF>ADJUSTMENT . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR690)>CVTF>ADJUSTMENT .

    Is the check result OK?

  6. CHECK TRANSMISSION FLUID. 

    Check the condition of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>CVTF>CONDITION CHECK . Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR690)>CVTF>CONDITION CHECK .

    Is the check result OK?

  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 [Actual Secondary Pressure] 0.5 - 1.5 MPa?

  8. CHECK INPUT SIGNAL FOR TCM. 
    1. Set the select lever to "D" range.
    2. Release the brake pedal to stabilize the engine speed and front wheel speed.
    3. Read the data of [Actual Gear Ratio] using Subaru Select Monitor.

    Is [Actual Gear Ratio] as follows?

    • Non-turbo model

      1.5 - 2.6

    • Turbo model

      2.0 - 2.4

  9. CHECK INPUT SIGNAL FOR TCM. 
    1. Set the select lever to "D" range.
    2. Slowly increase the speed to 40 km/h (25 MPH) and keep to a constant speed.
    3. Read the data of [Actual Gear Ratio] using Subaru Select Monitor.

    Is [Actual Gear Ratio] as follows?

    • Non-turbo model

      0.5 - 0.9

    • Turbo model

      0.5 - 0.8

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

    Does the AT OIL TEMP light blink and is DTC P0756 displayed?

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