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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 >> Tachometer Inaccurate or Inoperative >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON, perform the Gauge Sweep test. Refer to Engineering Mode Description and Operation . Verify that the tachometer gauge sweeps to approximately 1800 rpm and then returns to zero.
    • If the tachometer does not sweep properly 

      Replace the P16 Instrument Cluster.

    • Go to next step: If the tachometer sweeps properly 
  2. Drive the vehicle, verify the tachometer matches the values on the scan tool.
    • If the values do not match 

      Replace the P16 Instrument Cluster.

    • Go to next step: If the values match the scan tool 
  3. All OK.
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