Discovery II
BRAKES
70-18
DESCRIPTION AND OPERATION
The SLABS ECU continually calculates vehicle speed using the wheel speed inputs from all four ABS sensors. The
calculated vehicle speed is then used as a reference against which individual wheel speeds are monitored for
unacceptable acceleration or deceleration. The ABS sensor inputs are also used by the SLABS ECU to detect vehicle
deceleration rate, vehicle cornering rate and rough terrain.
The engaged forward gear and (on manual gearbox models) the clutch status are computed from the engine data
input, the engine speed input and vehicle speed. Reverse gear status is provided by an input from the reverse lamp
switch (manual gearbox models) or the BCU (automatic gearbox models). On automatic models, the BCU also
provides the neutral selected input.
In addition to controlling the brake related functions, the SLABS ECU:
l
Controls the operation of the self levelling suspension (SLS) system (where fitted).
REAR SUSPENSION, DESCRIPTION AND OPERATION, Description.
l
On V8 models, outputs a rough road signal to the ECM when traversing rough terrain.
l
Outputs a vehicle speed signal.
The vehicle speed signal is output to the following systems (where fitted):
l
FRONT SUSPENSION, DESCRIPTION AND OPERATION, Description - ACE.
l
AIR CONDITIONING, DESCRIPTION AND OPERATION, Description.
l
ENGINE MANAGEMENT SYSTEM - Td5, DESCRIPTION AND OPERATION, Description.
ENGINE MANAGEMENT SYSTEM - V8, DESCRIPTION AND OPERATION, Description - engine
l
ENGINE MANAGEMENT SYSTEM - Td5, DESCRIPTION AND OPERATION, Description.
ENGINE MANAGEMENT SYSTEM - V8, DESCRIPTION AND OPERATION, Description - engine
l
IN CAR ENTERTAINMENT, DESCRIPTION AND OPERATION, Description.
l
Instrument pack.
INSTRUMENTS, DESCRIPTION AND OPERATION, Description.
5
Front right inlet solenoid valve
Output
6
Shuttle valve switches
Input
7
Rear left outlet solenoid valve
Output
8
Rear left inlet solenoid valve
Output
9
Centre differential lock switch
Input
10
Rear right outlet solenoid valve
Output
11
Rear right inlet solenoid valve
Output
12
Brake lamp relay
Output
15
Return pump relay
Output
C0655
7
Audible warning
Output
10
Engine speed
Input
Connector and pins not listed are either not used or used by the self levelling suspension system.
REAR SUSPENSION, DESCRIPTION AND OPERATION, Description.
Connector/Pin
No.
Description
Input/Output