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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 198 (Manual Transmission - TREMEC 6-Speed (M3L Mg9)) >> Diagnostic Information and Procedures >> DTC P0502 or P0503: Vehicle Speed Sensor (MG9) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify DTC P0651 is not set
    • If DTC P0651 is not set 
    3. CAUTION:

    Support the lower control arms in the normal horizontal position in order to avoid damage to the drive axles. Do not operate the vehicle in gear with the wheels hanging down at full travel.

  3. Raise and support the drive wheels in a horizontal position.
  4. Start and idle the engine.
  5. Place the transmission in second gear and release the clutch pedal.
  6. Verify the scan tool Vehicle Speed Sensor parameter increases as the drive wheel speed increases.
    • If the Vehicle Speed Sensor does not increase 

      Refer to Circuit/System Testing.

    • If the Vehicle Speed Sensor increases 
  7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  8. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • If the DTC does not set 
  9. All OK.
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