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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector of the left side fuel level sensor.
  2. Ignition ON, verify the scan tool Fuel Level Sensor-Left Tank voltage parameter is at 5.0 volts.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
  3. Install a 3A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Fuel Level Sensor-Left Tank voltage parameter is at 0.0 volts.
    • If greater than the specified value, test the signal circuit for a high resistance. If the circuit tests normal, replace the ECM.
  4. Install a 3A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal D. Verify the scan tool Fuel Level Sensor-Left Tank voltage parameter is at 0.0 volts.
    • If greater than the specified value, test the low reference circuit for a high resistance. If the circuit tests normal, replace the ECM.
  5. Remove the fuel tank.
  6. Remove the fuel tank primary and secondary modules and inspect for the following conditions:
    • A clogged secondary fuel strainer and pick up
    • A clogged or restricted siphon jet pump
    • Broken, clogged or restricted flex tubes, primary fuel tank module
    • Broken, clogged, disconnected, or restricted fuel transfer tube inside tank
    • If you find any of the above conditions, repair as necessary.
  7. If all circuits/connections test normal, test or replace the left/secondary fuel level sensor.
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