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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 P0761 Shift Solenoid "C" Performance/Stuck Off; DTC P0762 Shift Solenoid "C" Stuck On; DTC P0781 1-2 Shift >> Circuit description

Circuit description

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The transmission control computer ASSY detects the gear position based on signals from the transmission revolution sensor (NT) and the transmission revolution sensor (SP2). Then, the transmission control computer ASSY detects mechanical problems of related solenoid valve, valve body, or automatic transmission when the detected gear position differs from the commanded position.

DTC DETECTION CONDITION

DTC No. SAE/TCCS DTC detecting condition
  1. Diagnosis condition
  2. Abnormal condition
  3. Abnormal period
  4. Other
 Inspection parts
P0761
  1. Driving in D position with ATF temperature at 20°C or higher and the coolant temperature at 40°C or higher (however, no malfunction is detected in transmission 3 way solenoid ASSY (S1, S2, S3, S4, SR), clutch control solenoid No. 1 (SL1, SL2), line pressure control solenoid ASSY (SLT), transmission revolution sensor (NT, SP2), neutral start switch, CAN bus, engine ECM communication, engine coolant temperature sensor, air flow sensor, electronic throttle control, and accelerator pedal sensor).
  2. Any of the following conditions is established.
    1. All of the following conditions are established.

      When the transmission control computer ASSY commands 1st gear, the actual gear is shifted to 3rd position. When the transmission control computer ASSY commands 6th gear, the actual gear is shifted to 6th position.

    2. All of the following conditions are established.

      When the transmission control computer ASSY commands 2nd gear, the actual gear is shifted to 6th position. When the transmission control computer ASSY commands 3rd gear, the actual gear is shifted to 4th position.

  3. -
  4. 2 trips
  • Transmission 3 way solenoid ASSY (S3)
  • Transmission wire
  • Wiring harness or connector
  • Transmission control computer ASSY
P0762
  1. Driving in D position with ATF temperature at 20°C or higher and the coolant temperature at 40°C or higher (however, no malfunction is detected in transmission 3 way solenoid ASSY (S1, S2, S3, S4, SR), clutch control solenoid No. 1 (SL1, SL2), line pressure control solenoid ASSY (SLT), transmission revolution sensor (NT, SP2), neutral start switch, CAN bus, engine ECM communication, engine coolant temperature sensor, air flow sensor, electronic throttle control, and accelerator pedal sensor).
  2. Any of the following conditions is established. When the transmission control computer ASSY commands 4th gear, the actual gear is shifted to 3rd position. When the transmission control computer ASSY commands 5th gear, the actual gear is shifted to neutral.
  3. -
  4. 2 trips
  • Transmission 3 way solenoid ASSY (S3)
  • Transmission wire
  • Wiring harness or connector
  • Transmission control computer ASSY
P0781
  1. Driving in D position with ATF temperature at 20°C or higher and the coolant temperature at 40°C or higher (however, no malfunction is detected in transmission 3 way solenoid ASSY (S1, S2, S3, S4, SR), clutch control solenoid No. 1 (SL1, SL2), line pressure control solenoid ASSY (SLT), transmission revolution sensor (NT, SP2), neutral start switch, CAN bus, engine ECM communication, engine coolant temperature sensor, air flow sensor, electronic throttle control, and accelerator pedal sensor).
  2. Any of the following conditions is established. When the transmission control computer ASSY commands 4th gear, the actual gear is shifted to 3rd position. When the transmission control computer ASSY commands 5th gear, the actual gear is shifted to neutral.
  3. -
  4. 2 trips
  • Transmission 3 way solenoid ASSY (S3)
  • Transmission wire
  • Wiring harness or connector
  • Transmission control computer ASSY
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