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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information And Procedures >> Outside Air Temperature Display Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON/Vehicle in Service Mode.
  2. Verify the scan tool ECM Ambient Air Temperature parameter is between -40°C (-40°F) and +88°C (+190°F) and changes with air temperature changes.
    • If not between -40°C (-40°F) and +88°C (+190°F) or changes with air temperature changes 

      Refer to Circuit/System Testing.

    • Go to next step: If between -40°C (-40°F) and +88°C (+190°F) and changes with air temperature changes 
  3. Perform the ECM Ambient Air Temperature Calculation Reset special function with the scan tool
  4. Verify the scan tool Ambient Air Temperature parameter is within five degrees of actual ambient air temperature.
    • If not within five degrees of actual ambient air temperature 

      Refer to Circuit/System Testing.

    • Go to next step: If within five degrees of actual ambient air temperature 
  5. All OK.
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