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Home >> Isuzu >> 2007 >> Ascender RWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Tachometer Inaccurate or Inoperative >> Circuit/System Testing

Circuit/System Testing

  1. Ignition ON, engine ON, verify the scan tool engine speed parameter for the IPC matches the tachometer display.
    • If the engine speed parameter does not match the tachometer display, test the signal circuit for a high resistance.
  2. If the circuit tests normal, replace the IPC.
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