Range Rover 2. Electrical Manual — part 155
DIESEL
A6
CIRCUIT OPERATION
4
Main Relay
Located in the ECM (Z132) box, this relay supplies
the power feed to the ECM (Z132). It is controlled via
the Ignition Switch (X274) in position II.
Glow Plug Relay (Z135)
The Glow Plug Relay (Z135) takes a feed directly
from the battery and, on initialisation via the ECM
(Z132), supplies current to each of the six glow plugs
(one per cylinder) to aid cold starting. The glow time
is controlled via the ECM (Z132) which also monitors
the relay and illuminates the glow plug indicator lamp
for the duration of the glow time. This relay is
relatively large and is located with the main relay
next to the ECM (Z132).
Starter Motor Relay
This relay is also ignition key controlled, activated
with the key in the ignition III position only. Releasing
the key after cranking cuts supply to the relay and
switches off the starter motor.
Fuel Pump Relay
The fuel pump relay is pulled in when the starter
motor is activated, the earth path provided by the
alternator output. When the engine is running, the
starter motor is deactivated, supplying an earth path
while the generator supplies a feed i.e. a polarity
reversal.
ECM (Z132)
If the ECM (Z132) itself is not working, the entire
engine management system will cease to operate,
i.e. no fuel, tacho reading, etc.
DIESEL
A6
5
CIRCUIT DIAGRAM
REV: 08/99
RL13
[13]
P125a
Engine
Compartment
Fuse Box
[13] A/C
Condenser
Fan 1 Relay
[14] A/C
Condenser
Fan 2 Relay
[15] Ignition
Relay
[18] A/C Control
Relay
[19] Engine
Main
Control
Relay
RL19
[19]
Not used
Shorting Link 5
2
RL15
[15]
5
2
1
3
RL18
[18]
3
1
5
4
RL14
[14]
8
C0575
3
C0577 4
C0571
30
F 44
30 A
8
C0577
4
Z238
Body Electrical
Control Module
(BECM)
9
C1281
W
RW
Heating and
Ventilation
YB
S572
E0556D
A
A6-6
1
C1503
2
C1503
K229
Solenoid Valve,
Injection Timing
Device
W
10
C0411
Z132
Engine Control
Module (ECM)
17
16
44
B
A6-9
K217
Fuel Heater
1
C0925
3
2
C0925
R
S571
B
See Ground
Distribution
18
E0556D
See Ground
Distribution
19
C0411
B
B
2
F
A6-15
Partial
F 37
30 A
D6
See Power
Distribution
30
S571
DIESEL
A6
6
CIRCUIT DIAGRAM
See Ground
Distribution
A
A6-5
See Ground
Distribution
C
A6-7
E0556D
F 0
80 A
RW
12
C0215
1
9
2
8
3
7
4
3
5
2
6
1
S574
11
6
5
C0215
S571
E0560
41
C0411
8
Z132
Engine Control
Module (ECM)
P104
Battery
Z135
Glow Plug Timer
Unit
See Power
Distribution
GK1
GK2
GK3
GK4
GK5
GZS
DIA
31
P120
Glow Plugs
KL30
30ES
BG
BP
BY
BR
BW
BN
B
BR
BY
BN
R
B
GK6
1
C0476
1
C0477
1 C0478
1
C0479
1
C1500
1
C1501
C0192
C0045
DIESEL
A6
7
CIRCUIT DIAGRAM
REV: 08/99
30
F 39
20 A
S114
D
A6-8
See Ground
Distribution
Z238
Body Electrical
Control Module
(BECM)
C
A6-6
15
C1289
D+
NY
S573
C0203
C0449
25
BN
2
C0577
6
Z106
Generator
1
C0570
5
2
Shorting Link 2
E0559
WO
B
2
C0574
RL 12
[12]
3
1
5
2
RL 16
[16]
3
1
30
F 40
40 A
D3
1
C0577 6
C0570
NR
WR
Starting and
Charging
P125a
Engine
Compartment
Fuse Box
[12] Fuel Pump
Relay
[16] Starter
Relay
Shorting Link 6
Not used
Not used
D2
D4
C0226D
Not used
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