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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the fuel level sensors.
  2. Ignition ON, verify that the scan tool fuel tank level remaining parameter is less than 4 percent
    • If greater than 4 percent, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
  3. If all circuits test normal, test or replace the fuel level sensors.
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