DTC 1-2-3 Engine Coolant Temperature Sensor Signal

1-2-3 ENGINE COOLANT TEMPERATURE (ECT) SENSOR SIGNAL

Condition(s) for DTC
^ If the ICM receives a signal corresponding to a temperature below -40°C (-40°F) (high signal value) or over 145°C (293°F) (low signal value), it will interpret the condition as a fault and the DTC will be recorded.

Substitute value
^ The ICM assumes a substitute value corresponding to a temperature of to 95°C (203°F).
^ The engine cooling fan is started at half speed.
^ Post-running of the fan at half speed continues for 3 minutes.

Fault source(s)
^ Signal too high:
- Signal lead short-circuited to supply.
- Open-circuit in signal lead.
- Contact resistance in connections.

^ Signal too low:
- Signal lead short-circuited to ground.

Fault symptom(s)
^ Engine is difficult or fails to start in certain temperature ranges.