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Home >> Subaru >> 2016 >> BRZ Premium >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Automatic Transmission (Diagnostics)) >> Automatic Transmission System >> DTC P2757 Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance/Stuck Off; DTC P2758 Torque Converter Clutch Pressure Control Solenoid Control Circuit Stuck On >> Circuit description

Circuit description

WARNING: This page is about a different variant/trim than selected.

The lock-up control solenoid (SLU) is controlled by the duty signal which is predetermined by the transmission control computer ASSY. Then, lock-up and flex lock-up control is performed.

DTC DETECTION CONDITION

DTC No. SAE/TCCS DTC detecting condition
  1. Diagnosis condition
  2. Abnormal condition
  3. Abnormal period
  4. Other
 Inspection parts
P2757
  1. All of the following conditions are established.

    Learning control is not prohibited.

    4 seconds or more passed after shifting to D position.

    Engine coolant temperature is 40°C or more.

    ATF temperature is 20°C or more.

    Gear range is 4th or higher.

    No malfunction is detected in transmission 3 way solenoid ASSY (S1, S2, S3, S4, SR), clutch control solenoid No. 1 (SL1, SL2), lock-up control solenoid (SLU), line pressure control solenoid ASSY (SLT), transmission revolution sensor (NT, SP2), neutral start switch ASSY, CAN bus, engine ECM communication, engine coolant temperature, electronic throttle control, and accelerator pedal.

  2. All of the following conditions are established.

    3 seconds or more passed after hydraulic command value of lock-up control solenoid (SLU) exceeds the specified value.

    Engine speed is higher than turbine revolution speed by 70 r/min or more.

    Gear range is 4th or higher.

    Throttle opening angle is the specification or more.

    Vehicle speed is 22km/h {14 MPH} or more

  3. 2 seconds or more passed for all conditions of item 2
  4. 2 trips
  • Transmission wire
  • Lock-up control solenoid ASSY (SLU)
  • Transmission control computer ASSY
  • Torque converter ASSY
P2758
  1. All of the following conditions are established.

    Learning control is not prohibited.

    4 seconds or more passed after shifting to D position.

    Engine coolant temperature is 40°C or more.

    ATF temperature is 20°C or more.

    Gear range is 4th or higher.

    No malfunction is detected in transmission 3 way solenoid ASSY (S1, S2, S3, S4, SR), clutch control solenoid No. 1 (SL1, SL2), lock-up control solenoid (SLU), line pressure control solenoid ASSY (SLT), transmission revolution sensor (NT, SP2), neutral start switch ASSY, CAN bus, engine ECM communication, engine coolant temperature, electronic throttle control, and accelerator pedal.

  2. All of the following conditions are established.

    3 seconds or more passed after hydraulic command value of lock-up control solenoid (SLU) drops to less than the specified value.

    Difference between engine speed and turbine revolution speed is less than 35 r/min.

    Gear range is 4th or higher.

    Throttle opening angle is the specification or more.

    Vehicle speed is 22km/h {14 MPH} or more

  3. After 2 or more seconds passed for all conditions of item 2, vehicle experiences the speed of less than 10 km/h {6 MPH}, then 2 or more seconds passed for all conditions of item 2 again.
  4. 2 trips
  • Transmission wire
  • Lock-up control solenoid ASSY (SLU)
  • Transmission control computer ASSY
  • Torque converter ASSY
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