P1114
DTC P1114
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. If the ECM detects an intermittent low ECT signal voltage, which is a high temperature indication, this DTC sets.
The following table illustrates the difference between temperature, resistance, and voltage:
DTC Descriptor
This diagnostic supports the following DTC:
DTC P1114 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage
Conditions for Running the DTC
* The engine run time is more than 120 seconds.
* This DTC runs continuously when the above condition is met.
Conditions for Setting the DTC
The ECM detects that the ECT is more than 149°C (300°F) intermittently.
Action Taken When the DTC Sets
* The control module stores the DTC information into memory when the diagnostic runs and fails.
* The malfunction indicator lamp (MIL) will not illuminate.
* The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
* The driver information center, if equipped, may display a message.
Conditions for Clearing the DTC
* A current DTC Last Test Failed clears when the diagnostic runs and passes.
* A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
* Clear the DTC with a scan tool.
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 driveability condition.
* If the vehicle has set overnight, the ECT sensor and the intake air temperature (IAT) sensor values should display within 3°C (5°F). Refer to Temperature Versus Resistance Temperature Versus Resistance.
* For an intermittent condition, refer to Intermittent Conditions Intermittent Conditions.
