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Home >> Isuzu >> 2007 >> Ascender RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Speedometer and/or Odometer Inaccurate or Inoperative (5.3L Engine) >> Circuit/System Testing

Circuit/System Testing

  1. Ignition ON, perform the segments test with the scan tool.
    • If not all of the segments illuminate, replace the IPC.
  2. Raise the vehicle drive wheels. Refer to Lifting and Jacking the Vehicle .
  3. Ignition ON, engine ON, transmission in Drive, verify the scan tool Vehicle Speed Sensor parameter in the IPC matches the speedometer display.
    • If the Vehicle Speed Sensor parameter does not match the speedometer display, test both the vehicle speed signal circuit for a high resistance and the high-front signal circuit at the transmission control module (TCM) for an open/high resistance, short to voltage or short to ground.
  4. If the circuits test normal, test or replace the IPC.
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