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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Electrical >> Gauges >> Displays And Gages >> Diagnostic Information and Procedures >> Speedometer and/or Odometer Inaccurate or Inoperative >> Circuit/System Testing

Circuit/System Testing

  1. Ignition ON, perform the speedometer gage sweep test with the scan tool.
    • If the speedometer gage does not sweep from its low to high position, replace the IPC.
  2. Ignition OFF, raise the vehicles drive wheels.
  3. Engine ON, transmission in drive, verify the scan tool Vehicle Speed Sensor parameter matches the speedometer display.
    • If the Vehicle Speed Sensor parameter does not match the speedometer display, replace the IPC.
  4. Verify that the odometer is operating properly.
    • If the odometer is not operating properly, replace the IPC.
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