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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the primary fuel level sensor.
  2. Ignition OFF, test for less than 1 ohm between the primary fuel level sensor low reference circuit terminal 4 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. Install a signal generator and instrument panel tester between the primary fuel level sensor signal circuit terminal 1 and the low reference circuit terminal 4.
  4. Ignition ON, vary the signal generator resistance between 40 and 250 ohms. Verify that the scan tool Fuel Level Sensor Left Tank parameter displays a range that varies between 0.5 volt and 4.5 volts as the signal generator resistance changes.
    • If not displaying 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 primary fuel level sensor.
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