COOLING FANS
K5
CIRCUIT OPERATION
2
Cooling Fan Operation (MFI–T16)
The Cooling Fan 1 (M141) or Cooling Fans (M141,
M142) 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 Motor operation is required.
Cooling Fan Operation (MFI–T16) without A/C
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 Operation (MFI–T16) with A/C
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 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). When Cooling 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).
Condenser Fan Operation (NAS) (SFI–V8)
The Condenser Fan Motors (M113, M121) on
vehicles equipped with SFI–V8 engines operate
when any of the following conditions occur:
1.
The A/C system is operating.
2.
The Engine Control Module (ECM) determines
that Condenser Fan Motor operation is required.
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 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 Condenser
Fan Motors (M113, M121). When 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 Condenser Fan Motors (M113,
M121).