Home/Toyota/Prius Plug-in/Toyota Prius Plug-in (2012-2014)/Repair manual/Cooling Fan/Engine Cooling Fan System (Diagnostics & Circuit Tests) (Ba…

Contents

Wiring diagrams Section: Cooling Fan

Engine Cooling System (Preparation) (Base)

Engine Cooling System (Inspection) (Base)

Cooling System (Preparation) (Plug-In)

Engine Cooling System (Inspection) (Plug-In)

All sections

Engine Cooling Fan System (Diagnostics & Circuit Tests) (Base): Overview Toyota Prius Plug-in

Cooling Fan 3 illustrations

Scheme 62

Scheme 62: ILLUSTRATION

Scheme 62: ILLUSTRATION

Scheme 63

Scheme 63: SYSTEM DIAGRAM

Scheme 63: SYSTEM DIAGRAM

Scheme 64

Scheme 64

Scheme 64

DESCRIPTION

The ECM turns on or off the fan relays using signals calculated from the engine coolant temperature, air conditioning switch (on/off), air conditioning refrigerant pressure, engine speed, and vehicle speed signals.

The ECM switches the circuit of the cooling fan motors between series and parallel by turning on or off the fan relays in order to control the speed of the cooling fan motors in two steps.