Diagnostic Trouble Code (DTC) Information

Condition

Fig 1: Identifying Engine Coolant Temperature Sensor

Courtesy of VOLVO CARS CORPORATION

If the control module receives a signal from the engine temperature sensor corresponding to a temperature lower than -47°C (-52.6°F) or higher than +143°C (289.4°F) the control module interprets it as a fault and ECM-2000 is stored. As soon as the engine is started the temperature is calculated theoretically. If the calculated temperature exceeds the engine coolant temperature (ECT) sensor signal, the control module interprets as a fault and ECM-2000 is stored.

Substitute Value

engine coolant temperature (ECT) is calculated using a model. Three-way catalytic converter (TWC) heating and fuel trim at start (starting trim), idle diagnostic and misfire diagnostic is disabled.
engine cooling fan (FC) runs at low-speed

Possible Source

Signal too high:

short-circuit to ground in the signal cable
defective temperature sensor

Signal too low:

open-circuit in the signal cable
short-circuit to supply voltage in the signal cable
defective temperature sensor
contact resistance in terminals

Faulty signal:

defective temperature sensor
faulty engine coolant thermostat

Fault symptom[s]

Malfunction indicator lamp (MIL) lit.