Circuit/System Verification

Ignition - On / Vehicle - In Service Mode
Verify no other DTCs are set.
- If any other DTCs are set
  Diagnose other DTCs first.
- Go to next step: If no other DTCs are set
Verify DTC P0072, P0073, P0074 is not set.
- If DTC P0072, P0073, P0074 is set
  Refer to: Circuit/System Testing
- Go to next step: If DTC P0072, P0073, P0074 is not set
Verify the scan tool parameter: Ambient Air Temperature =-40 to 88°C (-40 to 190°F) and changes
- If not between -40 and 88°C (-40 and 190°F) or does not change
  Refer to: Circuit/System Testing
- Go to next step: If between -40 and 88°C (-40 and 190°F) and changes
Verify HVAC system operates properly. Refer to: Symptoms - HVAC Systems - Automatic