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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the fuel level sensors.
  2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal B and ground.
    • If greater than the specified value, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition OFF, test for less than 1 ohm between the fuel level sensor signal circuit terminal C and the fuel level sensor signal circuit terminal E.
    • If greater than the specified, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition OFF, install a signal generator and instrument panel tester between the signal circuit terminal D and the low reference circuit terminal B.
  5. Ignition ON, vary the resistance on the signal generator from 40 to 250 ohms. 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 displaying the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, replace the ECM.
  6. If all circuits test normal, test or replace the fuel level sensors.
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