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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 P0721 Output Shaft Speed Sensor Circuit Range/Performance >> Circuit description

Circuit description

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The transmission revolution sensor (SP2) inputs the output shaft revolution speed to the transmission control computer ASSY as a signal.

The transmission control computer ASSY performs shift timing control based on transmission revolution sensor (SP2) signal and transmission revolution sensor (NT) signal.

DTC DETECTION CONDITION

DTC No. SAE/TCCS DTC detecting condition
  1. Diagnosis condition
  2. Abnormal condition
  3. Abnormal period
  4. Other
Inspection parts
P0721
  1. Engine RPM remains at 400 RPM or higher for 2 seconds or more, and a ratio of the vehicle speed determined from turbine speed to VDC wheel speed is less than 5 %. 2.5 seconds or more passed after shifting to D position. However, when the oil temperature sensor is faulty and the oil temperature is 20°C or lower, 10 seconds or more passed after shifting to D position).
  2. Ratio of vehicle speed determined from output revolution sensor to VDC wheel speed is more than 15 %.
  3. 10 seconds
  4. 1 trips
  • Transmission revolution sensor (SP2)
  • Wiring harness or connector
  • Transmission control computer ASSY