Cooling fans – circuit operation

COOLING FANS – CIRCUIT OPERATION

Cooling Fan and Condenser Fan Operation (MFI-T16)

The Cooling Fan 1 (M141) or Cooling Fans (M141, M142) and Condenser Fan Motors (M113, M121) on vehicles equipped with MFI-T16 engines operate when any of the following conditions occur: 1. The A/C system is operating. 2. The Engine Control Module (ECM) determines that Cooling Fan and/or Condenser Fan Motor operation is required.

Cooling Fan Operation without A/C (MFI-T16)

With the Ignition Switch (X134) in position II, battery voltage is applied to the Cooling Fan Relay (K190) from fuse F3 of the Satellite Fuse Box 1 (P127). When Cooling Fan Operation is required, the Engine Control Module (ECM) (Z132) grounds terminal 85 of the Cooling Fan Relay (K190). The relay energises, applying battery voltage from fuse F3 of the Engine Compartment Fuse Box (P125) to the Cooling Fan Motor 1 (M141). When Cooling Fan Operation is no longer required, the ECM removes the ground supply to the Cooling Fan Relay (K190). The Relay de-energises, removing the voltage supply to the Cooling Fan Motor 1 (M141).

Cooling Fan and Condenser Fan Operation with A/C (MFI-T16)

With the Ignition Switch (X134) in position II, battery voltage is applied to the Ignition Load Relay (K127). The relay is energised, applying battery voltage to the Condenser Fan Relay (K109). When Cooling Fan and Condenser Fan operation is required, the Engine Control Module (ECM) (Z132) grounds terminal 85 of the Condenser Fan Relay (K109). The relay energises, applying battery voltage from fuse F3 of the Engine Compartment Fuse Box (P125) to the Cooling Fan Motors (M141, 142) and the Condenser Fan Motors (M113, M121). When Cooling Fan and Condenser Fan operation is no longer required, the ECM removes the ground supply to the Condenser Fan Relay (K109). The relay de-energises, removing the voltage supply to the Cooling Fans (M141, M142) and the Condenser Fan Motors (M113, M121).