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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1831 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> Fuel Gage Inaccurate or Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the fuel level sensors. Install a signal generator and instrument panel tester between the signal circuit and the low reference circuit.
  2. Ignition ON, vary the resistance on the signal generator from 40 to 250 ohms. Verify that the scan tool Fuel Tank parameter displays the correct fuel level.
    • If the fuel level is incorrect, test the signal circuit and the low reference circuit for an open/high resistance. If the circuits test normal, replace the ECM/PCM.
  3. Ignition ON, vary the resistance on the signal generator from 40 to 250 ohms and monitor the fuel gage.
    • If the gage is incorrect, replace the IPC.
  4. If all circuits test normal, test or replace the fuel level sensors.
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