Diagnostic Trouble Code (DTC) Information CPM-3002

Condition 

Fig 1: Identifying Engine Coolant Temperature (ECT) Sensor

Courtesy of VOLVO CARS CORPORATION

The diagnostic trouble code (DTC) is stored if the control module registers that the signal on the cable from the engine coolant temperature (ECT) sensor is too high. The heater cannot be activated until the diagnostic trouble code (DTC) has been erased.

The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute Value 

• None.

Possible Source 

• Short-circuit to ground in the cable between the combustion preheater module (CPM) and the engine coolant temperature (ECT) sensor
• Contact resistance, oxidation or loose connections
• Damaged engine coolant temperature (ECT) sensor.

Fault symptom[s] 

• Poor heating in the passenger compartment
• The parking heater does not operate.