Range Rover 2. Electrical Manual — part 172
ANTI-LOCK BRAKE SYSTEM
D1
CIRCUIT OPERATION
2
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 SYSTEM
D1
3
CIRCUIT DIAGRAM
B
P125a
Engine
Compartment
Fuse Box
30
F 38
30 A
15
F 24
5 A
NK
1
C0575
W
8
C0571
S118
See Fuse Details
B
12
S114
E0559
See Ground
Distribution
E0556
WK
17
12
YG
3
11
C1289
BS
10
C1288
LHD
See Ground
Distribution
RHD
1
2
C0504
C1584
Z108
Anti–Lock Brake
System ECU
Z238
Body Electrical
Control Module
(BECM)
S103
RHD
LHD
LHD
RHD
LHD
RHD
18
C1584
C0504
ANTI–LOCK BRAKE SYSTEM
D1
4
CIRCUIT DIAGRAM
RL17
[17]
BY
7
C0570
30
MF 3
40 A
8
30
86
85
87
15
P125a
Engine
Compartment Fuse
Box
[17] A.B.S. Pump
Relay
11
Z108
Anti–Lock Brake
System ECU
S110
E0560
See Ground
Distribution
BW
10
C1584
11
C1288
Z238
Body Electrical
Control Module
(BECM)
BP
16
C1289
0
1
BW
0
[6]
0
0
[4]
[5]
5
B
1
C1590
B
C0855
Z104
A.B.S. Pressure Switch
Unit
[4]
Off < 110 Bar
[5]
On > 110 Bar
[6]
On < 140 Bar
Off = 180 Bar
M
E0561
See Ground
Distribution
E0557
2
C1587
C0507
1
C0507
C1587
M102
A.B.S. Hydraulic
Pump
BG
S109
NR
BG
X111
Brake Fluid Level
Switch
2
4
S122
E0557
LHD
RHD
LHD
RHD
LHD
RHD
LHD
RHD
LHD
RHD
LHD
RHD
LHD
RHD
LHD
RHD
LHD
RHD
LHD
RHD
S107
Z108
Anti–Lock Brake
System ECU
S141
S138
9
C0504 RHD
8
3
C0855
C1590
1
C1588
C0652
2
C0652
C1588
C1584 LHD
C0504
ANTI–LOCK BRAKE SYSTEM
D1
5
CIRCUIT DIAGRAM
Z238
Body Electrical
Control Module
(BECM)
0
0
[1]
[1]
YP
X168
Stop Lamp
Switch
[1]
Brake Pedal
Depressed
1
C0075
15
F 17
10 A
9
C1276
2
C0075
A
D1-6
3
S201
4
C1276
5
C0239
Z238
Body Electrical
Control Module
(BECM)
Z121
Cruise Control
ECU
S106
3
C0448
S131
7
C0504
Z108
Anti–Lock Brake
System ECU
S106
3
C0448
7
C1584
Z108
Anti–Lock Brake
System ECU
31
C0867
Z165
Air Suspension
ECU
26
C0411
Z132
Engine Control
Module (ECM)
C0203
W
GP
GP
GP
Petrol
Diesel
Diesel
RHD
LHD
Diesel
14
C0229
C0067
C0203
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