Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information CEM-5F39

Condition




The central electronic module (CEM) checks the communication with the combustion preheater module (CPM).
If Central electronic module (CEM) registers that the flame goes out in an non-allowed way during operation, the diagnostic trouble code is generated.
The diagnostic trouble code (DTC) can be diagnosed when the heater is activated.

Substitute value
- None.

Possible source
- No fuel supply
- Flame sensor clogged with soot
- Damaged flame sensor.
- Contact resistance in the control module connectors
- Open-circuit in the signal cable
- Short-circuit to supply voltage in the signal cable
- Open-circuit in the ground lead

Fault symptom[s]
- Poor heating in the passenger compartment.