2010 Cadillac CTS Sedan AWD V6-3.6L Page 1030

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1030



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions)provides an overview of each diagnostic category.



DTC Descriptors



DTC P0117



- Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage



DTC P0118



- Engine Coolant Temperature (ECT) Sensor Circuit High Voltage



Diagnostic Fault Information



Typical Scan Tool Data



Circuit Description



The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module



(ECM) supplies 5 volts to the ECT signal circuit and supplies a ground to the low reference circuit.



The following table illustrates the difference between temperature, resistance, and voltage:



Conditions for Running the DTC



P0117



* The engine is operating.



* The start up intake air temperature (IAT) is less than 72掳C (161掳F).



OR



* The start up intake air temperature (IAT) is greater than 72掳C (161掳F).



* The engine run time is greater than 59 seconds.



* The DTC runs continuously once the above conditions are met.



P0118



* The ignition is ON or the engine is operating.



* The DTC runs continuously once the above condition is met.



Conditions for Setting the DTC

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