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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  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 low reference circuit and ground.
    • If greater than 1 ohm, test the low reference circuit for a short to voltage or an open/high resistance. If the circuits tests normal, replace the PCM.
  3. Install a amp fused jumper wire between the signal circuit and the low reference circuit of the fuel level sensor. With the scan tool, observe the Fuel Tank Level Remaining parameter and verify the Fuel Tank Level Remaining parameter is greater than 4 percent.
    • If greater than 4 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 PCM.
  4. If all circuits tests normal, test or replace the fuel level sensor.
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