Range Rover. Manual — part 200
ABS
15
DESCRIPTION AND OPERATION
ABS ECU connector pin details - Up to 99MY (Continued)
Pin No.
Description
Input/Output
17
Front right wheel speed sensor
Input
18
Rear left wheel speed sensor
Input
19
Not used
-
20
Brake booster/ABS modulator - ETC normally closed
valve
Output
21
Brake booster/ABS modulator - Rear left inlet valve
Output
22
Brake booster/ABS modulator - Rear left outlet valve
Output
23
Brake booster/ABS modulator - Front left inlet valve
Output
24
Brake booster/ABS modulator - Front left outlet valve
Output
25
Brake switch 1 (normally open)
Input
26
BeCM - ABS warning lamp
Output
27
Earth
Input
28
BeCM - Road speed signal
Output
29
ECM - Rough road signal
Output
30
ABS pump low pressure warning switch 1
Output
31
ABS pump low pressure warning switch 2
Input/Output
32
Front left wheel speed sensor
Input
33
Rear right wheel speed sensor
Input
34
Front right wheel speed sensor
Input
35
Rear left wheel speed sensor
Input
70
BRAKES
NEW RANGE ROVER
16
DESCRIPTION AND OPERATION
ABS ECU connector pin details - From 99MY
ABS ECU connector face view
18 pin connector No. C504
9 pin connector No. C505
15 pin connector No. C506
Pin No.
Description
Input/Output
C504
1
Battery supply
Input
2
Ignition supply
Input
3
BeCM - Road speed signal
Input
4
ECM - Rough road signal (V8 only)
Output
5
Diagnostic socket - K line
Input
6
Not used
-
7
Brake pedal switch 1 (normally closed)
Input
8
ABS pump monitor
Input
9
ABS pump relay override
Input
10
ABS pump low pressure switch 2
Input
11
ABS pump low pressure switch 3
Input
12
ABS ECU earth
Input
C505
1
Front left wheel speed sensor
Input
2
Front left wheel speed sensor
Input
3
Right rear wheel speed sensor
Input
ABS
17
DESCRIPTION AND OPERATION
ABS ECU connector pin details - From 99MY - (Continued)
Pin No.
Description
Input/Output
4
Front right wheel speed sensor
Input
5
Front right wheel speed sensor
Input
6
Right rear wheel speed sensor
Input
7
Rear left wheel speed sensor
Input
8
Rear left wheel speed sensor
Input
9
Not used
-
C506
1
Front left ABS solenoid control valve
Output
2
Front left ABS solenoid control valve
Output
3
Reference earth
Input
4
Front right ABS solenoid control valve
Output
5
Front right ABS solenoid control valve
Output
6
Not used
-
7
Rear left ABS solenoid control valve
Output
8
Rear left ABS solenoid control valve
Output
9
Not used
-
10
Rear right ABS solenoid control valve
Output
11
Rear right ABS solenoid control valve
Output
12
ETC Normally open solenoid control valve
Output
13
Isolating valve
Output
14
Isolating valve
Output
15
ETC Normally closed solenoid control valve
Output
13
Not used
-
14
Brake pedal switch 2 (normally open)
Input
15
Not used
-
16
Not used
-
17
ETC warning lamp
Output
18
ABS warning lamp
Output
70
BRAKES
NEW RANGE ROVER
18
DESCRIPTION AND OPERATION
Relays and fuses - Up to 99MY
The ABS electrical system has two relays and three
fuses, located in the engine compartment fusebox.
•
Relay 2 (yellow) - ABS valve relay.
•
Relay 15 (green) - Ignition relay - ABS power.
•
Relay 17 (black) - ABS pump relay. Note that
this relay is unique to the ABS system.
•
Fuse Maxi 3 (40 Amp) - ABS pump relay.
•
Fuse 24 (5 Amp) - ABS ECU - Ignition supply.
•
Fuse 27 (30 Amp) - ABS ECU - Battery supply.
Relays and fuses - From 99MY
The ABS electrical system has two relays and three
fuses, located in the engine compartment fusebox.
•
Relay 15 (green) - Ignition relay - ABS power.
•
Relay 17 (black) - ABS pump relay. Note that
this relay is unique to the ABS system.
•
Fuse Maxi 3 (40 Amp) - ABS pump relay.
•
Fuse 24 (5 Amp) - ABS ECU - Ignition supply.
•
Fuse 38 (30 Amp) - ABS ECU - Battery supply.
Sensors, exciter rings - 4 off
A sensor is mounted at each wheel, sensing a 60
tooth exciter ring. When the vehicle is in motion the
inductive sensors send signals to the ECU.
The front exciter ring is fitted adjacent to the constant
velocity joint in each front hub. The rear exciter ring is
inside the axle adjacent to the wheel bearing
assembly.
NOTE: Road speed information from the
ECU is transmitted to the Body electrical
Control Module (BeCM) to drive the
speedometer and all systems requiring speed
information, except the transfer box ECU.
Brake calipers
Lucas Colette type calipers are used all round. The
front disc brake calipers each house two pistons,
hydraulic pressure is supplied by a combination of
power and hydrostatic circuit. The rear disc brake
calipers each house one piston, hydraulic pressure is
supplied by the power circuit via a Pressure
Conscious Reducing Valve (PCRV).
The operation of both front and rear calipers is in
principle the same. The Colette type caliper consists
of two main components, a carrier and a hydraulic
body assembly. The carrier is bolted to the hub
assembly. The hydraulic body slides on two greased
guide pins housed in the carrier. The guide pins are
sealed by the dust covers to avoid unequal sliding
loads caused by dirt or corrosion.
When the footbrake is applied hydraulic pressure
pushes the piston and, with it, the inboard pad on to
the disc. The hydraulic body reacts and slides on the
guide pins to bring the outboard pad into contact with
the disc. The clamping force on both sides of the disc
is then equal.
When hydraulic pressure is released, the piston seal
retracts the piston a small amount. This allows the
moving parts to relax sufficiently for the brake pads to
remain in close proximity to the disc ready for the next
brake application.
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