DTC Advanced Diagnostics: P0117, P0118 (K20C1)

DTC Advanced Diagnostics: P0117, P0118

DTC P0117:Engine Coolant Temperature (ECT) Sensor 1 Circuit Low Voltage
DTC P0118:Engine Coolant Temperature (ECT) Sensor 1 Circuit High Voltage

General Description

The powertrain control module (PCM) monitors engine coolant temperature (ECT) sensor 1 for electrical malfunctions. ECT sensor 1 is a thermistor that detects engine coolant temperature at engine outlet, which used in thermal management as engine coolant temperature. The ECT sensor 1 resistance varies depending on temperature. The sensor resistance and the output voltage increase as the engine coolant temperature decreases. The output voltage is continuously monitored against minimum and maximum thresholds. If the ECT sensor 1 output voltage is a specified value for a specified time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	0.5 second or more
DTC Type	One drive cycle, MIL on

Enable Conditions

Condition
Vehicle	ON mode

Malfunction Threshold

DTC: P0117

The ECT sensor 1 output voltage [ECT Sensor 1] is 0.0478 V or less for at least 0.5 second.

DTC: P0118

The ECT sensor 1 output voltage [ECT Sensor 1] is 4.957 V or more for at least 0.5 second.

[ ]: HDS Parameter

Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

DTC: P0117

ECT sensor 1 TW line short to ground

DTC: P0118

	ECT sensor 1 TW line short to power
	ECT sensor 1 TW line open
	ECT sensor 1 SG line open

Common

	ECT sensor 1 failure
	PCM internal circuit failure

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.