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Home >> Chevrolet >> 2014 >> Express 1500 LS, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC P0462 or P0463: Fuel Level Sensor 1 (with LC8 and KO7) >> Circuit/System Testing

Circuit/System Testing

NOTE:

The secondary fuel level sensor is only used as a input to the liquid propane gas control module to transfer fuel to the primary tank.

  1. Ignition OFF, disconnect the harness connector at the primary fuel level sensor.
  2. Test for less than 10 Ω between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal A and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the LPG Control Module.
    • 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 LPG control module.
  4. Ignition OFF, disconnect the harness connector at the LPG control module.
  5. Ignition ON, test for 4.0-6.0V between the signal circuit terminal C2 and ground.
    • 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 ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
    • If within specified range, replace the LPG control module.
  6. If all circuits test normal, replace the primary fuel level sensor.
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