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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the secondary fuel level sensor.
  2. Ignition ON, verify that the scan tool Fuel Tank Level Remaining parameter display is less than 4 percent.
    • If greater than the specified value, test the secondary signal circuit terminal C for a short to ground. If the circuit tests normal, replace the ECM.
  3. If all circuits test normal, test or replace the secondary fuel level sensor.
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