Land Rover Discovery Lhd Models Etm 1995 4th Edition Exp Rover Manual

COMPRESSOR CONTROLS
1
ETM K2
DISCOVERY
ELECTRICAL TROUBLESHOOTING MANUAL
CIRCUIT OPERATION
Compressor Control (MFI±V8) (300Tdi with EDC)
With the Ignition Switch (X134) in position II,
battery voltage is applied to the Ignition Load Relay
(K127). The relay is energized, applying battery
voltage to the Compressor Clutch Relay (K108)
and the A/C Logic Relay (K170). When the Front
Fan Speed Switch (X247) is turned to positions I,
II, III, or IV and the Front A/C Switch (X225) is
turned On, ground is...

COMPRESSOR CONTROLS
2
K2 ETM
DISCOVERY
ELECTRICAL TROUBLESHOOTING MANUA L
Compressor Control (300Tdi without EDC)
With the Ignition Switch (X134) in position II,
battery voltage is applied to the Ignition Load Relay
(K127). The relay is energized, applying battery
voltage to the Compressor Clutch Relay (K108).
When the Front Fan Speed Switch (X247) is turned
to positions I, II, III, or IV and the Front A/C Switch
(X225) is turned On, ground is provided to terminal
86 of the Compressor Clutch Relay (K108)...

ELECTRICAL TROUBLESHOOTING MANUAL
ETM K2
Compressor Controls
3
DISCOVERY
S2045
15
F 15
10 A
9 C204
E200
See Fuse Details
A
K2-8
P126
Fascia Fuse Box
0.5 LGP
85
30
C2007K127
Ignition Load
Relay
S227 2.0 WG87
B
K2-4
Z211
Fan Timer Diode
0.5 GW1.0 WG 2.0 WG
7 C2073
1.25 UR 0.5 WG
Cooling Fans
See Ground Dis-
tribution
See Fuse Details
30 C2007
15
F 6
25 AP127
Satellite Fuse
Box 1
85
86 87
86
0.5 B
K2-5MFI±V8
MFI±T16
S2015
K2-6 300Tdi without
EDC
K2-7 300Tdi with EDC
K2-10
C
1.0 WG13 C212
0.5 WG
HJ10 

ELECTRICAL TROUBLESHOOTING MANUA L
K2 ETM
Compressor Controls (MFI±V8)
4
DISCOVERY
S296
30
F 3
30 A
E100
See Fuse Details
16 C217
30 1.0 NG
[2] 30
87
86
85
86 C241
1.0 BG
85 C241 87
0.5 BS
33 C24321
30
30
87
85
86
85 C242
86 C242 87
1.0 WG
18 C217
B
K2-3
0.5 YB
11 C217
0.5 YB
9 C2073
0.5 U
0.5 OG
1 C2076 K108
Compressor
Clutch RelayK170
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
0.5 ON S295
1 C145
2...

ELECTRICAL TROUBLESHOOTING MANUAL
ETM K2
Compressor Controls (MFI±T16)
5
DISCOVERY
30
F 3
30 A
E103
See Fuse Details
16 C217
30 1.0 NG
[2] 30
87
85
86
85 C241
1.0 BG
86 C241 87
0.5 BS
19 C1007
30
30
87
86
85
86 C242
85 C242 87
0.5 YB
11 C217
0.5 YB
9 C2073
0.5 U
0.5 OG
1 C2076 K108
Compressor
Clutch RelayK170
A/C Logic Relay
Z132
Engine Control
Module (ECM)
1 C2077
8 C2073
0.5 ON S295
1 C145
2 C145B
1.0 B
K107
Compressor
Clutch
See Ground Dis-
tribution 1C116
P125
Engine Compart-
ment Fuse Box
0.5 BN
D...

C2073
ELECTRICAL TROUBLESHOOTING MANUA L
K2 ETM
Compressor Controls (300Tdi without EDC)
6
DISCOVERY
S295
30
F 3
30 A
1C116
E103
See Fuse DetailsP125
Engine Compart-
ment Fuse Box
1.0 NG
30
30
86 C241
0.5 G
11 C217
2 C162
K108
Compressor
Clutch Relay
X259
Compressor Clutch
Cut±out Switch
16 C217
See Ground Dis-
tribution
1.0 WG
85 C241
87
87
1.0 BG18 C217
B
K2-3
1 C162
0.5 YB
0.5 YB
9 C2073
0.5 U
1 C2076
X101
Front A/C Evaporator
Temperature Switch
[1] > 0
C (32
F)
[2] < 0
C (32
F)
8
1 C2077
0.5 OG
0.5...

ELECTRICAL TROUBLESHOOTING MANUAL
ETM K2
Compressor Controls (300Tdi with EDC)
7
DISCOVERY
S2060
30
F 3
30 A
E103
See Fuse Details
16 C217
30 1.0 NG
[2] 30
87
85
86
85 C241
1.0 BG
86 C241 87
0.5 BS
9 C24344
87
87
30
85
86
85 C242
86 C242 30
1.0 WG
18 C217
B
K2-3
1.0 YB
11 C217
0.5 YB
9 C2073
0.5 U
0.5 OG
1 C2076 K108
Compressor
Clutch RelayK170
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
0.5 ON S295
1...

ELECTRICAL TROUBLESHOOTING MANUA L
K2 ETM
Compressor Controls
8
DISCOVERY
52 C2025
10 C2067
2 C2022 2 C2067
See Ground Dis-
tribution
S263
1.0 UR
0.5 URBlower Controls
Interior Lamps
0.5 LG
0
13 C2025
0.5 WB
S244
E200
0.5
N
Blower ControlsS2056
2.0 N
See Ground Dis-
tribution
E200
1 C2022
0III
III
IV
4 C2073
Cooling Fans
19 C217 0.5 PB
1 C181
X102
A/C Dual Pressure
Switch
[1] > 32 Bar (455 psi)
[2] < 2.07 Bar (30 psi) 0.5 ON
2 C181MFI±T16 MFI±V8
[1] [2]
Z210
Condenser Fan
Control Diode 2
X247
Front Fan...

ELECTRICAL TROUBLESHOOTING MANUAL
ETM K2
Compressor Controls
9
DISCOVERY
0
8 C212
0.5 BG
D
MFI±T16 MFI±V8
K2-5 K2-4
300Tdi without EDC K2-6
300Tdi with EDC K2-7
1.0 BG
3 C448
1.25 BG
1 C464
K207
Rear A/C
Refrigerant Con-
trol Valve
2 C464
0.5 RG
1 C460
X260
Rear A/C Evapor-
ator Temperature
Switch
1 C461
0.5 P
9 C448
Z228
Rear A/C
Refrigerant Con-
trol Valve Diode
0.5 UB
12 C448
K205
Rear A/C Fan
Speed Relay
2 C466
30
87
4 C466
K193
Rear Blower
Motor Relay
3 C45785
5 C391
0III
III
IV
X246
Passengers...

COMPRESSOR CONTROLS
10
K2 ETM
DISCOVERY
ELECTRICAL TROUBLESHOOTING MANUA L
TROUBLESHOOTING HINTS
9. If the Blower Motor(s) do not operate normally,
refer to Blower Controls, Section K1.
10. Check Fuse F3 of the Engine Compartment
Fuse Box (P125), F3 of the Satellite Fuse Box,
and Fuse F15 of the Fascia Fuse Box (P126).
11. Verify that refrigerant pressure is OK before
preceeding with the following diagnostic text.
SYSTEM DIAGNOSIS (MFI±V8)
1. If the A/C Compressor Clutch (K107) does not
engage in any...