Friday, July 12, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 183


* Lower Auxiliary Air Temperature Sensor



* Auxiliary Inside Air Temperature Sensor



A signal and low reference circuit enables the sensor to operate. As the air temperature surrounding the sensor increases, the sensor resistance



decreases. The sensor signal voltage decreases as the resistance decreases. The sensor operates within a temperature range between -40 to +101锟斤拷C



(-40 to +215锟斤拷F). The sensor signal varies between 0-5 volts. The HVAC control module converts the signal to a range between 0-255 counts. As the



air temperature increases the count value will decrease. If the HVAC control module or auxiliary HVAC control module detects a malfunctioning



sensor, then the control module software will use a defaulted air temperature value. The default value for the ambient and inside air temperature



sensors will be displayed on the scan tool. The default value for the duct air temperature sensors will not be displayed on the scan tool. The scan tool



parameter for the duct air temperature sensors are the actual state of the signal circuit. The default action ensures that the HVAC system can adjust



the inside air temperature near the desired temperature until the condition is corrected.



Diagnostic Aids



Conditions for Running the DTC



Ignition ON.



Conditions for Setting the DTC



The HVAC control module detects the temperature sensor signal circuit is less than -36锟斤拷C (-38锟斤拷F) or greater than 215锟斤拷C (419锟斤拷F) for greater than 15



seconds.



Action Taken When the DTC Sets



The system operates using a default value.



Conditions for Clearing the DTC



* The DTC will become history if the HVAC control module no longer detects the condition that set the DTC.



* The history DTC will clear after 100 fault-free ignition cycles.



Reference Information



Schematic Reference



HVAC Schematics (See: Heating and Air Conditioning/Diagrams/Electrical Diagrams/HVAC - Automatic)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



* Air Temperature Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air



Temperature Description and Operation)



* Air Delivery Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air Delivery



Description and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

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