Discovery electrical Manual — part 63
COMPRESSOR CONTROLS (MFI–V8)
K2
5
CIRCUIT DIAGRAM
S296
30
F 3
30 A
E100
See Fuse Details
5
C217
30
NG
[1]
[2]
30
87
86
85
86
C241
BG
85
C241
87
BS
33
C243
21
30
30
87
85
86
85
C242
86
C242
87
WG
3
C217
B
K2-4
YB
10
C217
YB
9
C2073
U
OG
1
C2076
K108
Compressor
Clutch Relay
K170
A/C Logic Relay
X101
Front A/C Evap-
orator Tempera-
ture Switch
[1]
> 0
C (32
F)
[2]
< 0
C (32
F)
Z132
Engine Control
Module (ECM)
1
C2077
8
C2073
ON
S295
1
C145
2
C145
B
B
K107
Compressor
Clutch
See Ground Dis-
tribution
1
C116
GY
P125
Engine Compart-
ment Fuse Box
E
K2-10
D
K2-11
6
C216
MFI–V8
COMPRESSOR CONTROLS (MFI–T16)
K2
6
CIRCUIT DIAGRAM
30
F 3
30 A
E100
See Fuse Details
5
C217
30
[1]
[2]
30
87
85
86
85
C241
BG
86
C241
87
BS
19
C1007
30
30
87
86
85
86
C242
85
C242
87
YB
10
C217
YB
9
C2073
U
OG
1
C2076
K108
Compressor
Clutch Relay
K170
A/C Logic Relay
X101
Front A/C Evap-
orator Tempera-
ture Switch
[1]
> 0
C (32
F)
[2]
< 0
C (32
F)
Z132
Engine Control
Module (ECM)
1
C2077
8
C2073
ON
S295
1
C145
2
C145
B
B
K107
Compressor
Clutch
See Ground Dis-
tribution
1
C116
P125
Engine Compart-
ment Fuse Box
E
K2-10
BN
D
K2-11
6
C216
WG
Z132
Engine Control
Module (ECM)
35
C1007
B
E100
See Ground Dis-
tribution
15
F 3
10 A
See Fuse Details
P127
Satellite Fuse
Box 1
S2034
WG
B
K2-4
WG
3
C217
Not used
W
NG
MFI–T16
COMPRESSOR CONTROLS (SFI–V8)
K2
7
CIRCUIT DIAGRAM
S295
30
F 3
30 A
1
C116
E102
See Fuse Details
P125
Engine Compart-
ment Fuse Box
NG
30
30
86
C241
BS
7
C1027
1
C1032
K108
Compressor
Clutch Relay
See Ground Dis-
tribution
WG
85
C241
87
87
BG
B
K2-4
28
C1017
YB
YB
9
C2073
U
1
C2076
X101
Front A/C Evapor-
ator Temperature
Switch
[1]
COOLING FANS
K5
CIRCUIT OPERATION
1
CIRCUIT OPERATION
Condenser Fan Operation (MFI–V8)
The Condenser Fans Motors (M113, M121) on
vehicles equipped with MFI–V8 engines operate
when any of the following conditions occur:
1. Coolant temperature exceeds 100
C (212
F).
2. The air conditioning system is operating.
3. The Engine Control Module (ECM) (Z132)
determines that fuel temperature exceeds
70
C and coolant temperature exceeds 110
C
after engine shutdown. When this occurs, the
fans are turned on for approximately 10 minutes
after the engine is shut off.
Operation with High Coolant Temperature
(MFI–V8)
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) and the
Fan Control Module (Z118). 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 (MFI–V8)
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, ground is applied to terminal 86 of the Condenser
Fan Relay. The relay energises, applying battery
voltage from fuse F3 to the Condenser Fan Motors
(M113, M121).
Operation with the Engine Off (MFI–V8)
The Engine Control Module (Z132) monitors fuel
temperature and coolant temperature through
sensors. When the ECM determines that fuel
temperature is above 70
C and coolant temperature
exceeds 110
C after engine shutdown, the ECM will
command fan operation for approximately 10
minutes. The ECM turns on the fans by momentarily
grounding the Fan Control Module (Z118) through
the BG wire. When the timer unit is grounded, it
starts a solid state timer and begins to apply ground
from its terminal 9 to the Condenser Fan Relay
(K109) through the BP wire. With the Condenser
Fan Relay energised, voltage from fuse F3 is applied
to the Condenser Fan Motors (M113, M121) through
the relay contacts.
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