DTC P2184, P2185 (1.5 L Engine)
DTC P2184: Engine coolant temperature (ECT) Sensor 2 Circuit Low Voltage 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. The powertrain control module (PCM) applies voltage (about 5 V) to the TW2 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, the sensor resistance decreases, and the PCM detects a low signal voltage. If the ECT sensor 2 output voltage is a set value when the engine coolant temperature is high or low, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 2 seconds or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
DTC: P2184
The ECT sensor 2 output voltage [ECT Sensor 2 Voltage] is 0.08 V or less for at least 2 seconds.
DTC: P2185
The ECT sensor 2 output voltage [ECT Sensor 2 Voltage] is 4.92 V or more for at least 2 seconds.
[ ]: 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: P2184
- ECT sensor 2 TW2 line short to ground
DTC: P2185
- ECT sensor 2 TW2 line open
- ECT sensor 2 SG line open
Common
- ECT sensor 2 failure
- PCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.
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 or by disconnecting the 12 volt battery.