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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 310 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> Fuel Gauge Inaccurate or Inoperative (Dual Tank) >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the primary and secondary fuel level sensors.
  2. Ignition OFF, test for less than 1.0 Ω between the primary fuel level sensor low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition OFF, test for less than 1.0 Ω between the secondary fuel level sensor low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Jumper the primary fuel level sensor signal circuit terminal C to secondary fuel level sensor signal circuit terminal C. Install a signal generator and instrument panel tester between the jumped signal circuits and ground.
  5. Ignition ON, vary the signal generator resistance between 40-250 Ω. Verify that the scan tool Fuel Tank Level Remaining parameter displays a range that varies between 5 and 95 percent as the signal generator resistance changes.
    • If not within the specified range, test both signal circuits for an open/high resistance. If the circuits test normal, replace the ECM.
  6. Vary the signal generator resistance between 40-250 Ω. Verify that the fuel gauge displays a range that varies between empty and full as the signal generator resistance changes.
    • If the gauge is incorrect, replace the IPC.
  7. If all circuits test normal, perform the fuel level sensor component test before replacing either the primary or secondary fuel level sensor.
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