Diagnostic trouble code (DTC) information CEM-5F3F

Condition 

Fig 1: Identifying Fuel Pump

Courtesy of VOLVO CARS OF NORTH AMERICA.

The central electronic module (HEM) checks the communication with the combustion preheater module (CPM).

The diagnostic trouble code (DTC) is stored if the central electronic module (HEM) registers that the signal in the circuit for the fuel pump (FP) is too high.

The diagnostic trouble code (DTC) can be diagnosed when the heater is activated.

Substitute Value 

• None.

Possible Source 

• Short-circuit to supply voltage in the signal cable
• Damaged fuel pump.

Fault symptom[s] 

• Poor heating in the passenger compartment.
• Parking heater/Does not work