Checking Components And Wiring
- Check the cable between combustion preheater module (CPM) terminal #10 and the signal terminal for the combustion fan (the black lead from the fan). Check for an open-circuit. Check for a short-circuit to ground
- Check the cable between combustion preheater module (CPM) terminal #11 and the voltage terminal for the combustion fan (the red cable from the fan). Check for an open-circuit.
NOTE:
Diagnostic trouble codes (DTC) CEM-5F3A and/or CEM-5F3F may also be stored if there is a fault in the power cable.
The combustion fan must be replaced if no faults are found in the cable.
Remedy as necessary.
Other information
- see CONNECTING THE BREAKOUT BOX
- see SIGNAL SPECIFICATION
- see FUEL INJECTION NOZZLE / FAN MOTOR / PRESSURE EQUALIZER, REPLACING
- see CHECKING WIRING AND TERMINALS
- Continue
Refer to VERIFICATION
- Check the electrical terminals for the combustion fan and the combustion preheater module (CPM) connector. Check for contact resistance and oxidation
- Check the cable between combustion preheater module (CPM) terminal #10 and the signal terminal for the combustion fan (the black lead from the fan). Check for an intermittent open-circuit. Check for an intermittent short-circuit to ground
- Check the cable between combustion preheater module (CPM) terminal #11 and the voltage terminal for the combustion fan (the red cable from the fan). Check for an intermittent open-circuit.
Remedy as necessary.
Other information
- see CONNECTING THE BREAKOUT BOX
- To access the combustion fan, see: FUEL INJECTION NOZZLE / FAN MOTOR / PRESSURE EQUALIZER, REPLACING
- see SIGNAL SPECIFICATION
- see WATER PUMP ENGINE COOLANT HEATER, REPLACING
- see CHECKING WIRING AND TERMINALS
- Continue
Refer to VERIFICATION