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Home >> Chevrolet >> 2006 >> Impala LTZ >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays, Gauges And Console >> Diagnostic Information and Procedures >> Instrument Panel Cluster (IPC) Gages Inoperative >> Circuit/System Testing

Circuit/System Testing

IMPORTANT: If the suspect gage is the speedometer, the drive wheels of the vehicle must be raised and the transmission must be placed in drive or first gear.
  1. Install a scan tool.
  2. Start the vehicle.
  3. With the scan tool, perform the Display(s) Test in the IPC Output Controls.
    • If the gage moves from 0 to its maximum value and back to 0 when you perform the displays test, check the for a poor connection at the harness connector of the IPC.
    • If the gage does not perform the displays test by moving from 0 to its maximum value and back to 0, replace the IPC
  4. If the suspect gage is the speedometer, the gage display must match the ECM/PCM vehicle speed parameter in the ECM/PCM Engine Data List with the vehicle drive wheel raised and transmission in drive or first gear.
    • If the gage display does not match the ECM/PCM vehicle speed parameter, replace the IPC
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