Diagnostic trouble code (DTC) information ECM-2000

Condition 

Fig 1: Identifying 2-Bit Connector Side View

Courtesy of VOLVO CARS OF NORTH AMERICA.

Diagnostic trouble code (DTC) ECM-2000 is stored If the control module receives a signal from the engine temperature sensor corresponding to a temperature lower than -47°C or higher than +143°C. As soon as the engine is started the temperature is calculated theoretically. Diagnostic trouble code (DTC) ECM-2000 is stored (faulty signal) if the calculated temperature exceeds the engine coolant temperature (ECT) sensor signal.

Substitute Value 

• The engine coolant temperature (ECT) is calculated based on a model. Three-way catalytic converter (TWC) heating and fuel trim at start (starting trim), idle diagnostic and misfire diagnostic are disabled
• The 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: 

• Contact resistance and oxidation in the terminals
• Open-circuit in the signal cable
• Open-circuit in the signal ground cable
• Short-circuit to supply voltage in the signal cable
• Defective temperature sensor.

Faulty signal: 

• Defective temperature sensor
• Faulty engine coolant thermostat.

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit
• Engine difficult to start.