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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 P0979 Shift Solenoid "C" Control Circuit Low; DTC P0980 Shift Solenoid "C" Control Circuit High >> Circuit description

Circuit description

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Signals from the transmission control computer ASSY change the vehicle speed from 1st to 6th gear according to the combination of the transmission 3 way solenoid ASSY (S1, S2, S3, S4, SR) and the clutch control solenoid No. 1 (SL1, SL2). When there is an open or short circuit in the solenoid valve system, the transmission control computer ASSY stops continuity to all solenoids as the fail safe function. As a result, only the mechanical hydraulic circuit is available and the manual shift control is initiated.

DTC DETECTION CONDITION

DTC No. SAE/TCCS DTC detecting condition
  1. Diagnosis condition
  2. Abnormal condition
  3. Abnormal period
  4. Other
 Inspection parts
P0979
  1. Learning control is not prohibited.
  2. When transmission 3 way solenoid ASSY (S3) ON is output, S3 output monitor value is OFF.
  3. 500 ms or more durations
  4. 1 trips
  • Transmission 3 way solenoid ASSY (S3)
  • Transmission wire
  • Wiring harness or connector
  • Transmission control computer ASSY
P0980
  1. Learning control is not prohibited.
  2. When transmission 3 way solenoid ASSY (S3) OFF is output, S3 output monitor value is ON.
  3. 500 ms or more durations
  4. 1 trips
  • Transmission 3 way solenoid ASSY (S3)
  • Transmission wire
  • Wiring harness or connector
  • Transmission control computer ASSY
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