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Home >> Chevrolet >> 2017 >> City Express LS >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC P0460, P0461, P0462, P0463: Fuel Level Sensor >> Circuit/System Testing

Circuit/System Testing

NOTE:

Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A7 Fuel Pump and Level Sender Assembly. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 5 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the P16 Instrument Cluster.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Verify the scan tool Fuel Level Sensor parameter is less than 0.8 gal.
    • If greater than 0.8 gal 
    1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster.
    2. Test for infinite resistance between the signal circuit terminal 2 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • Go to next step: If less than 0.8 gal 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 5.
  6. Verify the scan tool Fuel Level Sensor parameter is greater than 0.8 gal.
    • If less than 0.8 gal 
    1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Ignition OFF
    4. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the P16 Instrument Cluster.
    • Go to next step: If greater than 0.8 gal 
  7. Test or replace the A7 Fuel Pump and Level Sender Assembly.
  8. Verify DTC did not set.
    • If DTC is set 

      Test or replace the K20 Engine Control Module.

    • Go to next step: If DTC is not set 
  9. All OK.
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