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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6T70 - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0722 or P0723: Output Speed Sensor >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    You must perform the Circuit/System Verification first.

  1. Ignition OFF, remove the control valve body cover.
  2. Connect the vehicle wire harness electrical connector to the Q8 Control Solenoid Valve Assembly electrical connector.
  3. Disconnect the B14A Transmission Output Shaft Speed Sensor wiring harness connector from the Q8 Control Solenoid Valve Assembly.
  4. Ignition ON.
  5. Test for 8.3-9.3V between the OSS sensor supply voltage circuit terminal A at the Q8 Control Solenoid Valve Assembly, and ground at the transmission case.
    • If not between 8.3-9.3V 
    1. Ignition OFF, disconnect the B14C Transmission Input Shaft Speed Sensor wiring harness connector from the Q8 Control Solenoid Valve Assembly. Ignition ON.
    2. Test for 8.3-9.3V between the OSS sensor supply voltage circuit terminal A X4 electrical connector at the Q8 Control Solenoid Valve Assembly, and ground at the transmission case.
      • If not between 8.3-9.3V, replace the Q8 Control Solenoid Valve Assembly.
      • If between 8.3-9.3V, replace the B14C Transmission Input Shaft Speed Sensor.
    • If between 8.3-9.3V 
  6. Verify the scan tool Transmission OSS parameter is between 256-266 RPM when performing the output shaft speed test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test .
    • If not between 256-266 RPM 

      Replace the Q8 Control Solenoid Valve Assembly.

    • If between 256-266 RPM 
  7. Verify there is no damage to the front differential transfer drive gear teeth surface or misalignment with the B14A Transmission Output Shaft Speed Sensor.
    • If the front differential transfer drive gear is damaged or is misaligned 

      Repair or replace as necessary.

    • If the front differential transfer drive gear is not damaged or misaligned. 
  8. Replace the B14A Transmission Output Shaft Speed Sensor.
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