Checking Components And Wiring
Check the electrical terminals for the combustion fan and the combustion preheater module (CPM) connector. Check for contact resistance and oxidation.
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Activate the combustion fan.
Listen for a buzzing sound which indicates that the combustion fan is running. If the combustion fan now operates, the cause of the fault was loose connections in the connectors.
The combustion fan must be replaced if no faults are found.
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.
Remedy as necessary.
Other information
- see CONNECTING THE BREAKOUT BOX
- To access or replace the combustion fan, see: FUEL INJECTION NOZZLE / FAN MOTOR / PRESSURE EQUALIZER, REPLACING
- see SIGNAL SPECIFICATION
- see CHECKING WIRING AND TERMINALS
- Continue
Refer to VERIFICATION