2010 Cadillac Truck SRX AWD V6-3.0L Page 1142
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 V 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 s.
* 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
P0117
The ECM detects that the ECT is greater than 140掳C (284掳F) for greater than 1 s or a cumulative of 10 s.
P0118
The ECM detects that the ECT is less than -39掳C (-38掳F) for greater than 1 s or a cumulative of 10 s.
Action Taken When the DTC Sets
DTC P0117 and P0118 are Type B DTCs.
The ECM may activate the Cooling Fans at high speed.
Conditions for Clearing the MIL/DTC
DTC P0117 and P0118 are Type B DTCs.
Diagnostic Aids
* Test the ECT sensor at various temperature levels in order to evaluate the possibility of a skewed sensor. A skewed sensor can result in a
