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Circuit/System Testing

NOTE: If equipped, the following tests can be performed at an inline connector. See schematics for the corresponding terminals to test at.
  1. Ignition OFF, disconnect the harness connector at the fuel level sensor.
  2. Ignition OFF, test for less than 1 Ω between the low reference circuit terminal C and ground.
    • If greater than the specified value, 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 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal C. Verify the Fuel Tank Level Remaining parameter is greater than 98 percent.
    • If less than the specified value, test the signal circuit 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 fuel level sensor.
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