Discovery electrical Manual — part 64
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).
COOLING FANS
K5
CIRCUIT OPERATION
3
Condenser Fan Operation (300Tdi)
The Condenser Fan Motors (M113, M121) on
vehicles equipped with diesel engines operate when
any one of the following conditions occur:
1. Coolant temperature exceeds 100
C (212
F).
2. The A/C is operating.
Condenser Fan with High Coolant Temperature
Operation (300Tdi)
When the Ignition Switch (X134) is 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). If the
coolant temperature exceeds 100
C (212
F), the
Condenser Fan Coolant Temperature Switch (X113)
closes and energises the Condenser Fan Relay
(K109) by applying ground to the relay’s coil. When
the relay is energised, voltage from fuse F3 is
applied to the Condenser Fan Motors (M113, M121)
through the relay’s contacts.
Fan Operation with A/C (300Tdi)
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 the Front
A/C Switch (X225) is turned on and the Front Fan
Speed Switch (X247) is turned to positions I, II, III, or
IV and grounding terminal 86 of the Condenser Fan
Relay (K109). The relay energises, applying battery
voltage from fuse F3 to the Condenser Fan Motors
(M113, M121).
COOLING FANS
K5
4
CIRCUIT DIAGRAM
A
S2124
S2041
Z211
Fan Timer Diode
See Ground Dis-
tribution
See Fuse Details
22
C204
LGP
85
30
C2007
NG
See Fuse Details
K127
Ignition Load Re-
lay
85
30
86
87
86
87
GW
B
WG
C2007
MFI–V8
Blower Controls
E200
K5-6
K5-11
K5-8
S2015
HJ10
With Air Condi-
tioning
With Air Condi-
tioning
30
F 6
25 A
P127
Satellite Fuse
Box 1
15
F 15
10 A
P126
Fascia Fuse Box
7
C2073
9
C212
3
C217
7
C2073
9
C212
7
C2073
Compressor
Controls
WG
UR
WG
UR
Blower Controls
S227
HJ4
S227
HJ4
S227
HJ4
Without Air
Conditioning
Except NAS
NAS
HJ13
K5-10
MFI–T16
300Tdi with
EDC
300Tdi with-
out EDC
COOLING FANS (MFI–V8)
K5
5
CIRCUIT DIAGRAM
30
F 7
20 A
S224
See Fuse Details
C239
86
NO
30
NLG
1
C100
85
87a
87
2
6
5
12
See Ground Dis-
tribution
UR
NO
NO
BG
B
36
C243
E100
C238
C238
C239
S291
HJ7
86
85
87a
30
87
K116
Engine Control
Load Relay
P125
Engine Compart-
ment Fuse Box
Z118
Fan Control Mod-
ule
Z132
Engine Control
Module (ECM)
Multiport Fuel In-
jection (MFI–V8)
MFI–V8
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст