Advanced Diagnostics

DTC P2185: Engine Coolant Temperature (ECT) Sensor 2 Circuit High Voltage




General Description
Engine coolant temperature (ECT) sensor 2 is a thermistor attached to the radiator side of the coolant manifold. The powertrain control module (PCM) applies voltage (about 5 V) to the ECT2 signal circuit through a pull-up resistor. As the engine coolant temperature cools, ECT sensor 2 resistance increases, and the PCM detects a high signal voltage. As the engine coolant warms, sensor resistance decreases, and the PCM detects a low ECT2 signal voltage.

If the ECT sensor 2 output voltage is more than a set value when the engine coolant temperature is low, the PCM detects a malfunction and a DTC is stored.




Monitor Execution, Sequence, Duration, DTC Type, OBD Status




Enable Conditions

Malfunction Threshold
The output voltage from the ECT sensor 2 is 4.92 V or more for at least 2 seconds.

Diagnosis Details

Conditions for illuminating the MIL
When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the PCM memory.

Conditions for clearing the MIL
The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.