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Home >> Hummer >> 2009 >> H3 Base, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel Displays And Gages >> Diagnostic Information and Procedures >> DTC P0464 >> Circuit/System Testing

Circuit/System Testing

NOTE: If equipped, the following tests can be performed at an inline connector. See schematics for the corresponding terminals to test at.
  1. Ignition OFF, disconnect the harness connector at the fuel level sensor.
  2. Ignition OFF, test for less than 1 Ω between the low reference circuit terminal 3 and ground.
    • If greater than the specified range, test the low reference 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 signal circuit terminal 2 and the low reference circuit terminal 3.
  4. Ignition ON, vary the signal generator resistance between 40 and 250 Ω. Verify that the scan tool Fuel Tank Level Remaining or the Fuel Level Sensor parameter displays a range that varies between 5 and 95 percent as the signal generator resistance changes.
    • If not within the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, perform the fuel level sensor component test before replacing the fuel level sensor.
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