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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the fuel level sensor.
  2. Ignition OFF, test for less than 1 ohm of resistance between the fuel level sensor low reference circuit terminal C and ground.
    • If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuits tests normal, replace the ECM.
  3. Install a 3A fused jumper wire between the fuel level sensor signal circuit terminal B and the fuel level sensor low reference circuit terminal C. Verify the Fuel Tank Level Remaining parameter is greater than 98 percent.
    • If less than 98 percent, test the fuel level sensor signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the ECM.
  4. If all circuits test normal, perform the fuel level sensor component test before replacing either the primary or secondary fuel level sensor.
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