DTC Advanced Diagnostics: P2183
DTC P2183:Engine Coolant Temperature (ECT) Sensor 2 Circuit Range/Performance Problem

General Description


The powertrain control module (PCM) monitors engine coolant temperature (ECT) sensor 2 for electrical malfunctions. ECT sensor 2 is a thermistor that detects engine coolant temperature at radiator outlet, which used in thermal management as engine coolant temperature upstream the engine. The ECT sensor 2 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 difference between ECT sensor 2 maximum and minimum temperature is a specified value for a specified time, or the difference between the ECT sensor 2 output temperature and mean value of all temperature sensors at cold start is more than a specified value for a specified time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous*, Once per driving cycle**
Sequence
None
Duration
0.5 second or more*, 90 seconds or more**
DTC Type
Two drive cycles, MIL on
*: Stuck check
**: Cold start check

Enable Conditions
Stuck check
Condition
Minimum
Maximum
Engine coolant temperature [ECT Sensor 1]
–
176.5 °F (80.3 °C)
Initial engine coolant temperature [ECT Sensor 1]
–
289.9 °F (143.3 °C)
Outside air temperature
-54 °F (-48 °C)
–
Temperature difference between engine coolant temperature [ECT Sensor 2] and ambient temperature
–
344.3 °F (191.3 °C)
Engine speed [Engine Speed]***
1,520 rpm
–
Vehicle speed [Vehicle Speed]***
4 mph (5 km/h)
198 mph (318.8 km/h)
Other
Engine coolant temperature [ECT Sensor 2] is near outside air temperature
Other than during fuel cut-off operation***
***: Conditions must be met for at least 5 minutes

Cold start check
Condition
Minimum
Maximum
Engine off time
6 hours
–
State of the engine
Running
[ ]: HDS Parameter

Malfunction Threshold
Either of the conditions occurs:
Stuck check
The temperature difference between maximum and minimum of ECT sensor 2 is 2.7 °F (1.5 °C) or less.
Cold start check
The difference between the ECT sensor 2 output temperature and mean value of all temperature sensors at cold start is more than 44 °F (24 °C).

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.
Engine coolant level low
Thermostat failure
ECT sensor 2 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.