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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 >> Fuel Gage Inaccurate or Inoperative >> Circuit/System Testing

Circuit/System Testing

  1. Disconnect C000.
  2. Connect a signal generator and instrument panel tester between the signal circuit of the fuel level sender and the low reference circuit of the fuel sender on the male side.
  3. With the ignition ON and the engine OFF, vary the resistance on the signal generator from 40-250 ohms.
    • If the fuel gage displays the correct fuel level, check the signal circuit and the low reference circuit of the fuel level sensor for a high resistance between the fuel level sensor and C413.
    • If both the signal circuit and the low reference circuit tests normal, check for a poor connection at the harness connector of the fuel level sensor.
    • If the harness connector is normal, check for a misaligned fuel sender or a misaligned fuel tank.
  4. Install a scan tool.
  5. With the ignition ON and the engine OFF, vary the resistance on the signal generator from 40-250 ohms and observe the Fuel Level Remaining parameter in the ECM/PCM EVAP Data list.
    • If the scan tool does not display the correct fuel level percent, replace the instrument panel cluster (IPC).
    • If the scan tool does display the correct fuel level percent, check the signal circuit and the low reference circuit of the fuel level sensor for a high resistance between the ECM/PCM and C413.
    • If both the signal circuit and the low reference circuit tests normal, check for a poor connection at the harness connector of the ECM/PCM.
    • If the harness connector is normal, replace the ECM/PCM.
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