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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Automatic Transmission - 6T40 (MNH MNK) Or 6T45 (MHG) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0722, P0723, P077C, Or P077D: Output Speed Sensor Circuit >> Circuit/System Testing

Circuit/System Testing

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

    You must perform the Circuit/System Verification first.

  1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
  2. Connect the DT-48616-10  adapter harness between the vehicle harness connector and the Q8 Control Solenoid Valve Assembly connector.
  3. Ignition ON.
  4. Test for 11 - 13 V between the OSS sensor voltage circuit terminal B at the Q8 Control Solenoid Valve Assembly X4 connector and ground.
    • If not between 11 - 13 V 

      Replace the Q8 Control Solenoid Valve Assembly.

    • Go to next step: If between 11 - 13 V 
  5. Verify the scan tool Transmission OSS parameter is between 745 - 825 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 745 - 825 RPM 

      Replace the Q8 Control Solenoid Valve Assembly.

    • Go to next step: If between 745 - 825 RPM 
  6. Verify there is no damage to the park gear, or misalignment between the B14A Transmission Output Shaft Speed Sensor and the park gear.
    • If the park gear is damaged or misaligned 

      Repair or replace as necessary.

    • Go to next step: If the park gear is not damaged or misaligned 
  7. Replace the B14A Transmission Output Shaft Speed Sensor.
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