P1114
DTC P1114
Circuit Description
The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The powertrain control module (PCM) supplies 5 volts to the ECT signal circuit and a ground for the ECT low reference circuit. When the ECT is cold, the sensor resistance is high. When the ECT increases, the sensor resistance decreases. With high sensor resistance, the PCM detects a high voltage on the ECT signal circuit. With lower sensor resistance, the PCM detects a lower voltage on the ECT signal circuit. If the PCM detects an excessively low ECT signal voltage, which is a high temperature indication, DTC P1114 sets.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P1114 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage
Conditions for Running the DTC
* The engine is running for more than 10 seconds.
OR
* The engine run time is less than 10 seconds when the intake air temperature (IAT) is less than 70°C (158°F).
* DTC P1114 runs continuously when the above conditions are met.
Conditions for Setting the DTC
The PCM detects that the ECT sensor parameter is more than 149°C (300°F) intermittently or more than 30 seconds.
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.
Test
