Diagnostic Trouble Code (DTC) Information CPM-3402

Condition 

Fig 1: Identifying Flame 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 flame sensor is too low. 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 flame sensor
• Contact resistance, oxidation or loose connections
• Damaged flame sensor.

Fault symptom[s] 

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