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Home >> Buick >> 2012 >> Regal Turbo, Standard Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Fuel Gauge Malfunction - DTC P0461-P0464 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the A7 fuel pump and level sensor assembly.
  2. Test for less than 30 Ω at the low reference circuit terminal 3.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
  3. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 4 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  4. Remove the fuel level sensor.
  5. Verify there is no damage to any component in the surrounding area of the fuel level sensor that would inhibit the mechanical range of the sensor.
    • Repair or replace any damaged component as necessary.
  6. If all circuits test normal, replace the A7 fuel pump and level sensor assembly.
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