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Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, perform the Instrument Cluster Gauge Sweep test with the scan tool, verify that the fuel level gauge sweeps from its low to high position.
    • If the fuel level gauge does not sweep 

      Replace the P16 Instrument Cluster.

    • Go to next step: If the fuel level gauge sweeps 
  2. Command the All Indicators test ON and OFF with the scan tool, verify that the low fuel level indicator turns ON and OFF.
    • If the low fuel level indicator does not turn ON or OFF as commanded 

      Replace the P16 Instrument Cluster.

    • Go to next step: If the low fuel level indicator turns ON and OFF as commanded 
  3. Observe the scan tool ECM Fuel Level Sensor parameter. The reading should be 0.5 - 3.5 V and vary with fuel level.
    • If the reading does not vary with fuel level 

      Refer to Circuit/System Testing.

    • Go to next step: If the reading varies with fuel level 
  4. All OK.
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