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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> Fuel Gage Inaccurate or Inoperative (Dual Tanks) >> 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. Jumper the 2 signal circuits together and then install a signal generator and instrument panel tester between the signal circuits and the low reference circuit.
  2. Ignition ON, vary the resistance on the signal generator from 40-250 ohms. Verify that the scan tool Fuel Tank Level Remaining parameter displays the correct fuel level percent.
    • If the fuel level percent is incorrect, test both signal circuits and the low reference circuit for an open/high resistance. If the circuits test normal, replace the ECM.
  3. Ignition ON, vary the resistance on the signal generator from 40-250 ohms and monitor the fuel gage.
    • If the gage is incorrect, replace the IPC.
  4. If all circuits test normal, test or replace either the primary or secondary fuel level sensor.
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