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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Instrument Panel System Displays & Gages) >> Diagnostic Information and Procedures >> DTC P0463 (3.8L, 5.3L, 6.0L, 6.2L, 7.0L Engines) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. 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 fuel level sensor low reference circuit terminal C and ground.
    • If greater than the specified range, test the low reference circuit terminal C for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PCM.
  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 terminal B and low reference circuit terminal C for a short to voltage or an open/high resistance. If the circuits test normal, replace the PCM.
  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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