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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, 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 a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition ON, install a 3A fused jumper between the signal circuit terminal D and the low reference circuit terminal B. Verify the scan tool Fuel Tank Level Remaining parameter is greater than 98 percent.
    • If less than 98 percent, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the fuel level sensors.
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