Range Rover 2. Electrical Manual — part 29
INSTRUMENTS
E1
CIRCUIT OPERATION
1
CIRCUIT OPERATION
Engine Coolant Temperature Gauge
The engine coolant temperature gauge sensor has
the capability to sense from –40
_
C to +130
_
C. Petrol
and Diesel resistance valves are different.
Both Petrol and Diesel sensors are interfaced to the
Instrument Cluster (Z142) via the BeCM (Z238). The
resistance value then being represented by an A/D
data transfer generating the required angular
deflection on this gauge.
]
Fuel Gauge
When the fuel tank level is low (“E”), the resistance
value of the gauge sensor is 270
Ω
for petrol and
diesel engines. As the fuel level increases, the
resistance of the sensor decreases. When the fuel
tank is full, the resistance value of the sensor for
petrol engines is 19
Ω
and for diesel engines 25.8
Ω
.
When the fuel gauge sensors resistance value
increases to 175
Ω
(9 liters/2.25 US gallons, the low
fuel warning light will illuminate to warn of the fuel
status. Both Petrol and Diesel sensors are interfaced
to the Instrument Cluster (Z142) via the BeCM
(Z238). The resistance values then being
represented by an A/D data transfer generating the
required angular deflection on the gauge.
Speedometer
The signal to activate the gauge is originated at the
ABS wheel sensors, transmitted to the ABS ECU
(Z108) which then puts out a usable signal to the
Instrument Cluster (Z142) of 8000 pulses per mile or
4972 pulses per kilometer. The signal is also
transmitted to other ECU’s, such as the Engine
Control Module (ECM) (Z132) and the Cruise Control
ECU (Z121).
Tachometer
The tachometer will display the engine speed in
R.P.M. It will derive the engine speed from the
engine speed pulse train transmitted from the Engine
Control Module (ECM) (Z132).
The pulse rate for petrol engines will be 4 pulses per
engine revolution.
The pulse rate for diesel engines will be 3 pulses per
engine revolution.
Audible Warning
Receipt of an audible warning request signal from a
vehicle parameter/message condition shall cause the
BeCM (Z238) to generate the required number of
warning tones. The actuator sounder unit is located
at the rear of the Instrument Cluster (Z142).
See message listing for categories/priority and levels
of audible warnings.
INSTRUMENTS
E1
2
CIRCUIT DIAGRAM
LG
LG
5
7
C258
17
14
[15]
4
C242
B
S205
See Fuse Details
30
F 1
10 A
7
B
8
BG
14
18
BG
5
2
2
12
10
RG
RG
1
13
9
OG
OG
E254
P
P
3
C242
11
15
3
C256
9
Y
YG
11 C114
Z238
Body Electrical
Control Module
(BECM)
Z142
Instrument
Cluster
[1]
Speedome-
ter
[15] Control
Unit and
Message
Centre Dis-
play
Z108
Anti–Lock Brake
System ECU
Z238
Body Electrical
Control Module
(BECM)
[1]
28
C116R
C116L
LHD
RHD
16
INSTRUMENTS
E1
3
CIRCUIT DIAGRAM
Z142
Instrument
Cluster
[2]
Tachometer
[3]
Fuel Gauge
[15] Control
Unit and
Message
Centre Dis-
play
Z238
Body Electrical
Control Module
(BECM)
Z132
Engine Control
Module (ECM)
Z132
Engine Control
Module (ECM)
Z134
Fuel Pump Mod-
ule
[1]
Fuel Level
Sensor
10
16
C242
15
8
C256
BK
S
10
C114
GB
1
C110
2
C110
B
S115
E167
23
C505
S
2
C106B
C506B
2
C106A
C506A
NAS
Except NAS
Petrol
Diesel
50
C572
20
C121
C571
S
9
C112
[2]
[3]
[15]
[1]
See Ground Dis-
tribution
INSTRUMENTS
E1
4
CIRCUIT DIAGRAM
[4]
Z142
Instrument
Cluster
[4]
Tempera-
ture Gauge
Z238
Body Electrical
Control Module
(BECM)
C114
19
G
Petrol
Diesel
C106
8
C506
C519
1
X114
Engine Coolant
Temperature
Gauge Sensor
C588
1
X114
Engine Coolant
Temperature
Gauge Sensor
2
B
E529
C519
See Ground Dis-
tribution
S505
C588
1
X114
Engine Coolant
Temperature
Gauge Sensor
C121
12
C571
2
E167
C588
C571
6
C121
S115
up to model year
97
from model year
98
B
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