82-Sensor Too Cold To Start Cooldown Test (MTC): Notes

Fig 1: Evaporator Temperature Sensor Circuit Schematic

Courtesy of CHRYSLER LLC

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article.

When Monitored:
When executing the Cooldown Test.
Set Condition:
If the A/C Heater Control senses that the evaporator temperature is below 18.3°C (65°F) when executing the Cooldown Test.

Possible Causes
FAULTS PRESENT IN THE HVAC SYSTEM
EVAPORATOR TEMPERATURE BELOW 18.3°C (65°F) AT START OF COOLDOWN TEST
HIGH RESISTANCE ON (C121) SENSOR GROUND CIRCUIT
HIGH RESISTANCE ON (C21) EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT
EVAPORATOR TEMPERATURE SENSOR
A/C HEATER CONTROL

NOTE: This DTC will display as active if the ignition is not cycled after running the Cooldown Test. Otherwise, it will display as stored until cleared.