Cooling Fan Operation

Cooling Fan Operation

A feed from the battery positive terminal, via the alternator (C183-1), is connected by a red wire to the engine compartment fusebox (C574-1) and passes through fusible links 3 and 6 and fuses 2, 3 and 7. Fusible link 6 is connected in series with fuses 2 and 3.

A feed from fusible link 3 (C571-2) in the engine compartment fusebox, is connected by a brown and red wire to the ignition switch (C028-3).

From the ignition switch (C028-5), the feed is connected by a green wire to the passenger compartment fusebox (C588-3) where it passes through fuse 3. The feed from fuse 3 continues from the passenger compartment fusebox (C581-10) to the Engine Control Module (ECM) (C126-55) on a white wire.

A feed from fuse 3 (C572-3) in the engine compartment fusebox is connected by a brown wire to two pins on the main relay (C063-2 and C063-4).

A feed from fuse 2 (C572-2) in the engine compartment fusebox is connected by a brown and white wire to the relay module (C172-8).

A feed from fuse 7 (C573-4) in the engine compartment fusebox is connected by a brown wire to the relay module (C172-7).

The ECM (C126-53) supplies a signal feed to the Engine Coolant Temperature (ECT) sensor (169-6) on pink and green wire. The ECM measures the resistance to its signal through the ECT sensor. When the resistance reaches a certain value the ECM issues a cooling fan series or parallel grant.