Auxiliary Water Pump

An auxiliary water pump is installed to ensure the necessary water flow rate at low engine RPM.

The auxiliary water pump is switched on when the following conditions are fulfilled:

• Water valve is opened (de-energized)
• Engine RPM < 2000 RPM
• Engine temperature > 32 °F
• Start procedure completed (terminal 50)

The auxiliary water pump is switched off when, apart from the engine speed that must exceed 2500 RPM, at least one of the above conditions is not fulfilled.