Fuel Fired Booster Heater Control Unit

Fuel Fired Booster Heater Control Unit

Note! The illustrations in this service information are used for different model years and/or models. Some variation may occur. However, the essential information in the illustrations is always correct.

Preparatory work

Removing the engine coolant heater
Remove the engine coolant heater. See: Fuel Fired Booster Heater, B5254T7, L.H.D Fuel Fired Booster Heater

Important information
If the combustion preheater module (CPM) is to be moved from one vehicle to another, note down any diagnostic trouble codes (DTCs) and operating times before removing the control module from the vehicle.
Always check that the pins or sockets in the control module connectors are not bent or damaged. This might be the cause of the fault.

Removal

Removing the combustion preheater module (CPM)




Slacken off the 4 screws. See the illustration.
Carefully pull the combustion preheater module (CPM) straight out to access the connector.
Position a small screwdriver between the control module connector and its 2 catches. Turn the screwdriver carefully to release the catches.
Pull off the control module.

Installation

Installing the combustion preheater module (CPM)
Install the switch so that it is properly secured.
Position the control module. Ensure that the control module housing goes correctly into the grooves at the top edge.
Tighten the 4 screws crosswise.
Install the engine coolant heater. See: Fuel Fired Booster Heater, B5254T7, L.H.D Fuel Fired Booster Heater

Finishing

Final check of the engine coolant heater
Test run the engine coolant heater and check its function. See: Fuel-powered preheater, checking Fuel-Powered Preheater, Checking
Check that no diagnostic trouble codes (DTCs) have been stored while the repair was carried out.