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Home >> Chevrolet >> 2018 >> Impala Premier, Gas >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Fuel Gauge Malfunction (CNG Fuel Gauge) >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify the fuel level gauge sweeps when performing the scan tool Instrument Cluster Gauge Sweep control function.
    • If the fuel level gauge does not sweep 

      Replace the P16 Instrument Cluster

    • Go to next step: If the fuel level gauge sweeps 
  3. Verify the scan tool Alternative Fuel Level Sensor parameter is between 0.5 - 3.5 V and varies with fuel level.
    • If not between 0.5 - 3.5 V or does not vary with fuel level 

      Refer to Circuit/System Testing.

    • Go to next step: If between 0.5 - 3.5 V and varies with fuel level 
  4. All OK.
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