Land Rover Range Rover Etm 1995 4th Edition Rover Manual

							ANTI±LOCK BRAKE SYSTEMD1
7CIRCUIT DIAGRAM 20
X137
Left Front Wheel
Speed Sensor
B
2C155
NX158
Right Front
Wheel Speed
Sensor
B
2C180
NX140
Left Rear Wheel
Speed Sensor
B
21 C145
NX161
Right Rear Wheel
Speed Sensor
B21 C144
N
Z108
Anti±Lock Brake
System ECU
[6]
SLGS SNSKSRSUSGSP SY SWSOSB 22423 6 721 22 4 5 1112C116R
12 8 1 6 7 11 5 13 4 9 10 2 C125R
[6]
[1]
[1]
[2[
[2]
[4]
[4]
[5]
[5]
[7]
[7]
Z103
A.B.S. Booster
Unit
[1] Left Front
[2] Right Front
[4] Left Rear
[5] Right Rear
[6] Traction
Control
[7] Demanual
B 1 C126L
E149 C126RC125L C116L 32 15 17 34 18 35 16 33 C116LC116R
LHD
RHDLHD
RHD LHD
RHD LHD
RHD 1 1
E149
RHD LHD 
						

							ANTI±LOCK BRAKE SYSTEMD1
8CIRCUIT DIAGRAM
Z238
Body Electrical
Control Module
(BECM)
S205
30
F 1
10 A
4 C242 14
Z142
Instrument
Cluster
[15] Control Unit
and Mess-
age Centre
Display
[15]
818
145
212
210
313
19
515
11
717
Z238
Body Electrical
Control Module
(BECM)
E254
7 C258
C242
C256 3 B B BG BG RG RG OG OG LG LGP P

P!
BRAKE
See Fuse Details 
						

							DATA LINK CONNECTORD3
1CIRCUIT DIAGRAM
30
F 33
5 A
X127
Data Link Con-
nectors
P125a
Engine Com-
partment Fuse
BoxZ260
Air Suspension
Delay Turn Off
Timer
C172 4C1183
N
C102
13
C202
166
C231 1C104
C204
5 4 13 14 11 12 C231
BP
C202
5
C102
E181B
S207
E252YK YG
18 17 C202
C102
2 5 C103
C403
20 11 C401
Z151
Air Bag Diag-
nostic Control
ModuleZ165
Air Suspension
ECU WLG WK
12 11 C204
C104
35 17 C117
SR
See Ground Dis-
tribution
See Ground Dis-
tribution 
						

							DATA LINK CONNECTORD3
2CIRCUIT DIAGRAM
Z132
Engine Control
Module (ECM)Z132
Engine Control
Module (ECM)
Z108
Anti±Lock Brake
System ECU
C507
9KR
10C506
C106
LGR42 27 C572
PR GR
17 16C571
C121
KR LGR
KR LGR Petrol Diesel13 14 C116R
C116L
KLG
15 16C102
C202
Z253
Heating Ventila-
tion and Air
Conditioning
Control Unit
(HEVAC) 2 3 C246A
KR LGR Z253
Heating Ventilation
and Air Condition-
ing Control Unit
(HEVAC)
6 7 C246B
KR LGR
With Air Condi-
tioningWithout Air
Conditioning
KR LGR8 17 C255
S214S213 KR LGR
X127
Data Link Connectors7 15 C231Z238
Body Electrical
Control Module
(BECM) Not used 23TXD RXD
LHD
RHD
KR LGR 
						

							DATA LINK CONNECTORD3
3CIRCUIT DIAGRAM
Z238
Body Electrical
Control Module
(BECM)
C626 1
51 15 C601
Z255
Auto Gear Box
Control Unit
LG
12
K 
						

							INSTRUMENTSE1
CIRCUIT OPERATION1
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 (ªEº), the resistance
value of the gauge sensor is 270W 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 19W  and for diesel engines 25.8W .
When the fuel gauge sensors resistance value
increases to 175W  (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 ECUs, 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. 
						

							INSTRUMENTSE1
2CIRCUIT DIAGRAMLG LG
5
7 C258
17
14
[15]
4 C242
BS205
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
PP
3 C242
11
15
3C256
9
YYG
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
C116LLHD
RHD
16 
						

							INSTRUMENTSE1
3CIRCUIT 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 C256BK S
10 C114
GB
1C110
2C110
B
S115
E16723 C505S 2C106B
C506B2C106A
C506A NAS Except NASPetrol Diesel
50 C572 20C121
C571S 9C112
[2] [3]
[15]
[1]
See Ground Dis-
tribution 
						

							INSTRUMENTSE1
4CIRCUIT 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 SensorC121
12
C571
C588 1
X114
Engine Coolant
Temperature
Gauge Sensor 
						

							WARNINGS AND INDICATORSE2
CIRCUIT OPERATION1
CIRCUIT OPERATION
All warning Indicators are controlled by Data sent to
the Instrument Cluster (Z142) from the Body
Electrical Control Module (BeCM) (Z238). All data is
transmitted via the serial data lines. The BeCM
(Z238) will provide data based upon input from
various sensors.
Some warning lights may also be accompanied by a
message which will appear in the message centre
display on the instrument pack.
Service Reminder Indicator (SERVICE ENGINE)
Illuminates briefly (for 3 seconds) as a bulb check
when the Ignition switch is turned to position II.
Illuminates continuously when the vehicle reaches
50,000 miles (80,500 km) approx.
Low Fuel Warning Indicator
Illuminates briefly (for 4 seconds) as a bulb check
when the Ignition Switch is turned to position II.
When the fuel gauge sensors resistance value
increases to 175W  (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).
High Temperature Warning Indicator
Illuminates briefly (for 4 seconds) as a bulb check
when the Ignition switch is turned to position II.
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).
Malfunction Indicator Lamp (CHECK ENGINE)
Illuminates briefly when the Ignition Switch is turned
to position II as a bulb check and extinguishes when
the engine is running. Illumination at any other times
indicates an engine fault.
Both Petrol and Diesel Engine Control Modules
(Z132) are interfaced to the Instrument Cluster
(Z142) via the BeCM (Z238).
Oil Pressure Warning Indicator
Illuminates as a bulb check when the Ignition switch
is turned to position II, and extinguishes when the
engine is running.
The Oil Pressure Switch (X149) is closed with Low
Oil Pressure.
Both Petrol and Diesel switches are interfaced to the
Instrument Cluster (Z142) via the BeCM (Z238).
ABS Warning Indicator
This light illuminates for approximately 1 second
when the Ignition switch is turned to position II, and
then briefly extinguishes before coming on again.
The warning indicator will then remain illuminated
until the vehicle is driven above approximately 5 mph
(7 km/h). If the light does not extinguish or
illuminates again then a fault has occurred with the
ABS system.
If the light remains illuminated once a speed of 5
mph (7km/h) has been reached, or subsequently
illuminates whilst driving, a fault has been detected
by the self±monitoring system. The message centre
will display 
ABS FAULT.
The ABS System is interfaced to the Instrument
Cluster (Z142) via the BeCM (Z238).