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.

CONDITIONS FOR RUNNING THE DTC
The engine run time is more than 10 seconds.

CONDITIONS FOR SETTING THE DTC
The PCM detects that the ECT sensor parameter is more than 138°C (280°F) intermittently for a calibrated amount of time.

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
- An ECT sensor or PCM which is intermittently shorted, open, or skewed is possible, but very unlikely
- An intermittent short to ground in the ECT sensor signal circuit could result in a DTC P1114.
- Use the Temperature vs. Resistance Value scale to test the coolant sensor at various temperature levels to evaluate the possibility of a skewed sensor. A skewed sensor could result in poor driveability conditions. Refer to Temperature vs Resistance.
- For an intermittent condition, refer to Intermittent Conditions. Diagnostic Strategies

TEST

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Steps 8 - 9: