Cooling Sys. - CC Message 'Eng. Too Hot'/DTC's Stored
SI M17 01 10Cooling System
February 2011
Technical Service
SUBJECT
Auxiliary Water Pump Faults
MODEL
All models with N14 and N18 Engine
SITUATION
Check Control message (CC message) "Engine is too hot" is displayed and/or the following faults are stored in the DME:
For N14:
^ 2F37 - auxiliary water pump, actuation, open circuit
^ 2F36 - auxiliary water pump, actuation, short-circuit to earth
^ 2F35 - auxiliary water pump, actuation, short-circuit to positive
For N18:
^ 3786 - auxiliary coolant pump, actuation, open circuit
^ 3785 - auxiliary coolant pump, actuation, short-circuit to earth
^ 3784 - auxiliary coolant pump, actuation, short-circuit to positive
CAUSE
The auxiliary water pump (for the turbocharger) intermittently doesn't power up, due to internal component failure.
PROCEDURE
Check that the electrical connector to the coolant pump is locked in properly and that there is battery voltage at the pump. If no fault can be found with the connector or supply voltage, replace the auxiliary water pump for the turbocharger with an improved pump (refer to parts information). Refer to Repair Instruction RA11 53 590 for replacement of the pump and proper coolant bleeding procedures.
PARTS INFORMATION
WARRANTY INFORMATION