Land Rover Range Rover Etm 1995 4th Edition Rover Manual

							AUTOMATIC GEARBOXB7
7CIRCUIT DIAGRAM
Z238
Body Electrical
Control Module
(BECM)
S205
30
F 1
10 A
4 C242 14
Z142
Instrument
Cluster
[15] Control
Unit and
Message
Centre Dis-
play
[15]
818
145
212
210
313
19
515
11
17 7
Z238
Body Electrical
Control Module
(BECM)
E254
7 C258
C242
C256 3
BG BG RG RG OG OG LG LG BBP P
See Fuse Details 
						

							IGNITION AND SHIFT INTERLOCKC1
CIRCUIT OPERATION1
Circuit Operation
Selector Interlock
The Gear Selector Lever may only be moved out of
the Park position when the ignition is on and the
brake pedal is depressed. The Shift Lock Solenoid
shall be energised continuously whilst the Ignition is
on and the Gear Selector Lever is in a position other
than Park or Neutral.
Ignition Key Interlock
The Ignition Key Lock Solenoid shall at all times
prevent removal of the Key from the Ignition Switch
unless the Gear Selector Lever is in the Park
position. 
						

							IGNITION AND SHIFT INTERLOCKC1
2CIRCUIT DIAGRAM
P01 1
R00 1
N10 1
D10 0
3000
2010
1110
Z* 1 1 1
XY Z UBS610
S609
S608 UP UG
See Ground Dis-
tribution
E621
6 C562
BG
5 C560
C660
10
C559 C659
XYZ
[1] [2] [3]
00 0
3 C562 2 1
Z238
Body Electrical
Control Module
(BECM)
Z238
Body Electrical
Control Module
(BECM)
9 C258
W
15
1 C227
[1]
X168
Stop Lamp
Switch
[1] Brake Pedal
Depressed
0[1]0 S211
See Fuse Details
13 C256
WK
X134
Ignition Switch
8
W
0III
III
0III
III
31 C238
X294
Gear Box Position Switch
[1] X Switch
[2] Y Switch
[3] Z Switch
See Ground Dis-
tribution
E252
4 C238
8918 C626
67
C560 C660
Automatic Gear-
box
3
GP
4 C258 S201
2 C227
YP
Anti±Lock Brake
System F 17
10 A
1 =
0 =
* =Switch Open
Switch Closed
Fault 
						

							IGNITION AND SHIFT INTERLOCKC1
3CIRCUIT DIAGRAM
X298
Transfer Micro Switch/
Shift Lock Solenoid
[1] Transfer Micro
Switch
[2] Lo Range Selected
[3] Shift Lock Solenoid
(with Shift Lock
only) PR
Transfer Gearbox
6 C625
0[2]Z238
Body Electrical
Control Module
(BECM)
[1]
[3]
25 C615A
1
B
S607
E621
4C615A
B
S611
See Ground Dis-
tribution
NW
3 C255
UK10 C258
0 [1]
1 C2331 C234
X229
Key±In Switch
[1] Key In-
sertedK191
Ignition Key Lock
Solenoid
PG
B
2 C233
B
3 C234
S215
E252
See Ground Dis-
tribution
30
F 13
20 A30
F 13
20 A 
						

							ANTI-LOCK BRAKE SYSTEMD1
CIRCUIT OPERATION1
CIRCUIT OPERATION
The Anti±Lock Brake System prevents wheel lockup
during braking. This enables the driver to maintain
vehicle stability and `steerability while braking.
The Electronic Traction Control System aids traction
when a rear wheel spins or loses traction. The
system works by applying the brake to the spinning
rear wheel. The braking action allows more torque to
be transferred and applied to the non±spinning rear
wheel.
Anti±Lock Brake System ECU (Z108)
The Anti±Lock Brake System ECU (Z108) is a
computer that controls ABS system operation by
consistently monitoring the vehicles 4 wheel speeds
when the ignition is in position II. If an impending
wheel lock up is detected during this monitoring, the
Anti±Lock Brake ECU (Z108) will apply voltage to
the various inlet and outlet valve solenoids contained
in the ABS Booster Unit (Z103). Operation of the
solenoid valves regulates the pressure applied to
each wheel brake calliper and therefore prevents
wheel lock±up.
Electronic Traction Control (ETC) is an extension to
the Anti±Lock Brake System ECU. In addition to
monitoring the rear wheel speeds for lockup, the
Anti±Lock Brake System ECU also monitors wheel
speed for traction control. When rear wheel slip is
detected (one wheel spinning faster than the other),
the Anti±Lock System ECU will apply the brake to
the spinning wheel, causing additional torque to be
applied to the non±spinning wheel.
The Anti±Lock Brake System ECU applies the brake
by operating various inlet and outlet solenoid valves
in the ABS Booster.
The ETC warning light will be on for up to 60
seconds while the system is active, and the
message TRACTION is displayed. After 60 seconds
of ETC operation, the ETC warning light will begin to
flash to inform the driver that the system has been
shut down to allow the brakes to cool. Also the
message TRACTION OVERHEAT is displayed.
If the ETC warning light stays on continuously for
more than 60 seconds, a fault in the system is
indicated. The message TRACTION FAILURE is
also displayed.
The Anti±Lock Brake System ECU (Z108) also has
diagnostic capabilities that allow it to detect faults
that may impair the systems efficiency. If a faultoccurs, the ECU informs the operator of a problem
by illuminating the ABS or the ETC warning light.
The ECU also illuminates the warning light when the
ignition is first placed in position II. The ABS warning
light will remain illuminated until the ECU completes
a self check of the system. When the ECU sees all
wheels reach a speed of 7 km/h (5 mph), the self
check is completed and the ABS warning light turns
off. If a fault is detected during the self check, the
ABS or the ETC warning light will remain on and a
fault code will be stored in memory to aid in servicing
the system. When an ABS fault has been detected,
the message ABS FAULT may also display.
The fault code can be retrieved using a diagnostic
tester. 
						

							ANTI-LOCK BRAKE SYSTEMD1
CIRCUIT OPERATION2
ABS Booster Unit (Z103)
The ABS Booster Unit (Z103) contains 2 isolation
solenoid valves and 4 pairs of solenoid control
valves which are grounded through the harness.
When the ETC is fitted, the booster unit also
contains an additional 2 solenoid valves. The pairs of
solenoid control valves each include a fluid pressure
inlet and outlet valves that control ABS braking to
one wheel.
The Anti±Lock Brake System ECU (Z108) operates
these valves by applying battery voltage to them.
The valves are designed to decrease, hold or
increase pressure to retain wheel rotation and
optimum braking.
The 2 isolation valves consist of 2 solenoid valves
that control fluid inlet and outlet. Their function is to
disconnect or isolate the master cylinder from the
servo cylinder and to connect the servo cylinder to
the reservoir return during ABS functions.
Wheel Speed Sensors (X137, X140, X158, X161)
A wheel speed sensor is located at each wheel. The
speed sensors generate an AC voltage signal as a
toothed ring rotates past the stationary sensor
pickup. The Anti±Lock Brake System ECU (Z108)
calculates the wheel speed by measuring the
frequency of the AC voltage signal generated by the
sensors.
ABS Hydraulic Pump (M102)
The hydraulic boost for the system is provided by the
ABS Hydraulic Pump (M102), which is controlled by
the ABS Pump Relay (K102) and the ABS Pressure
Switch Unit (Z104).
The Pressure Switch unit incorporates three
electro± mechanical switches. The first operates the
pump, two more illuminate the low pressure
condition and signal that ABS and ETC functions
should be curtailed. The Hydraulic Pump includes a
hydraulic accumulator and non±return valve, as well
as a pressure relief valve to protect the system.
When low pressure occurs in the brake system, a
switch in the pressure switch unit closes to ground
the coil of the pump relay. The pump relay now
energizes and applies battery voltage from the fuse
to the hydraulic pump through the closed relay
contacts. The hydraulic pump runs to increase
pressure in the hydraulic accumulator. When
sufficient pressure is developed in the system, the
pressure switch opens to de±energize the pump
relay and to turn off the hydraulic pump.
ABS Warning Lamp
The Anti±Lock Brake System ECU (Z108) sends
signals to the BeCM which then controls the
illumination of the ABS warning lamp. The BeCM
also controls the display of the system messages.
Solenoid Valve Relay
This is energized by the ABS ECU and sends
voltage back to the part of the same ECU which
controls the solenoid valves in the booster. When the
ABS ECU detects a fault that requires a complete
system shutdown, the relay is de±energized. 
						

							ANTI±LOCK BRAKE SYSTEMD1
3CIRCUIT DIAGRAM
Z108
Anti±Lock Brake
System ECU
BG
8 C116R
RL2
[2]
S114
E167
See Ground Dis-
tribution
B B
2 C172
P125a
Engine Compart-
ment Fuse Box
[2] A.B.S.
Power Relay30
F 27
30 A15
F 24
5 A
NK
5 C173
W8 C176
S118
See Fuse Details
B
27
S115
E167
See Ground Dis-
tribution
E148
WK
3
12
YG
28
11 C114
BS
26 C116R
10 C112
C116L
LHD
See Ground Dis-
tribution RHDC116L
6 C176 6 C176
1
9 C116L
C116R
Z108
Anti±Lock Brake
System ECU
Z238
Body Electrical
Control Module
(BECM) S103
31
2 5
RHD
LHD LHD
RHD
LHD
RHD
LHD
RHD 
						

							ANTI±LOCK BRAKE SYSTEMD1
4CIRCUIT DIAGRAM
RL17
[17]
BY
7 C177
30
MF 3
40 A
8
30 86
85 87
15
P125a
Engine Compart-
ment Fuse Box
[17] A.B.S. Pump
Relay
30
Z108
Anti±Lock Brake
System ECU
S110
E181
See Ground Dis-
tribution
BW
31C116R
11 C112Z238
Body Electrical
Control Module
(BECM)
BP16 C114
01 BW
0 [6]
0
0[4]
[5]
1
B5C184L
BC184RZ104
A.B.S. Pressure
Switch Unit
[4] Off < 110 Bar
[5] On > 110 Bar
[6] On < 140 Bar
Off 180 Bar
M
E182
See Ground Dis-
tribution
E154 2C156L
C156R 1
C156R C156L
M102
A.B.S. Hydraulic
Pump
2 C124RC124L
1 C124L
C124R
BG
S109
NRBG C116L
X111
Brake Fluid Level Switch
4 2 3 C184RC184L
S122
E154LHD
RHD
LHD
RHD
LHD
RHD
LHD
RHD
LHD
RHD
LHD
RHDLHD
RHD
LHD
RHDLHD
RHD LHD
RHD
S107 
						

							ANTI±LOCK BRAKE SYSTEMD1
5CIRCUIT DIAGRAM
Z238
Body Electrical
Control Module
(BECM)
0 0 [1][1]
YPX168
Stop Lamp
Switch
[1] Brake Pedal
Depressed
1 C227
15
F 17
10 A
9 C258
S211See Fuse Details
2C227
A
D1-6
3
S201
4 C258
14C202
5 C243
Z238
Body Electrical
Control Module
(BECM)Z121
Cruise Control
ECU
S106
3C121
S131
25 C116L
Z108
Anti±Lock Brake
System ECU
S106
3C121
25 C116R
Z108
Anti±Lock Brake
System ECU
31 C117
Z165
Air Suspension
ECU26 C572
Z132
Engine Control
Module (ECM)
C571
C571 C102W
GP
GP GPPetrol
Diesel Diesel
RHD LHD
Diesel 
						

							ANTI±LOCK BRAKE SYSTEMD1
6CIRCUIT DIAGRAM
S203
9C202
31 C572
Z132
Engine Control
Module (ECM)
C102B
A
D1±5
YP
9C202C102
680 
K152
Resistor
S207
E252
2C121
C571
10 C116L
Z108
Anti±Lock Brake
System ECU
13
15
S214
14 C116R
16C102
C202
S213
C116L
C116R
K
715
C231
See Ground Dis-
tribution
KRKR
LGR
X127
Data Link Con-
nectorsLHD
RHD
LHD
RHD
Data Link Con-
nector LG Petrol DieselNot installed on
all vehicles
LGR