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Home >> Chevrolet >> 2008 >> Uplander Base, 3.9 1 >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays & Gages >> Diagnostic Information and Procedures >> Fuel Gage Inaccurate or Inoperative >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the fuel level sensor.
  2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal C and ground.
    • If greater than the specified range, test the circuit for an open/high resistance. If the circuits tests normal, replace the ECM.
  3. Install a Signal Generator and Instrument Panel Tester between the fuel level sensor signal circuit terminal B and the low reference circuit terminal C.
  4. Ignition ON, vary the signal generator resistance between 40-250 ohms. Verify that the scan tool Fuel Tank Level Remaining parameter displays a range that varies between 0.5-4.5 volts as the signal generator resistance changes.
    • If not displaying the specified range, test the circuit for an open/high resistance. If the circuit test normal, replace the ECM.
  5. Vary the signal generator resistance between 40-250 ohms. Verify that the fuel gage displays a range that varies between empty and full as the signal generator resistance changes.
    • If the gage is incorrect, replace the IPC.
  6. If all circuits test normal, perform the fuel level sensor component test before replacing the fuel level sensor.
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