Understanding ABS in Freelander Braking System: Operation and Description
BRAKES
70-14
DESCRIPTION AND OPERATION
Operation
ABS
The purpose of ABS is to prevent vehicle wheels locking during brake application, thus maintaining vehicle steerability
and stability. This allows the vehicle to be steered while the brakes are applied, even under emergency conditions,
and to avoid obstacles where there is sufficient space to redirect the vehicle.
WARNING: ABS is an aid to retaining steering control and stability while braking:
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ABS cannot defy the natural laws of physics acting on the vehicle.
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ABS will not prevent accidents resulting from excessive cornering speeds, following another vehicle too
closely, aquaplaning, etc.
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The additional control provided by ABS must never be exploited in a dangerous or reckless manner
which could jeopardise the safety of driver or other road users.
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The fitting of ABS does not imply that the vehicle will always stop in a shorter distance.
NOTE: During normal braking the feel of the brake pedal on vehicles equipped with ABS will be the same as that on
non ABS vehicles. During anti-lock braking operation the driver will experience feedback in the form of a pulsating
brake pedal and solenoid/pump motor noise from the ABS modulator.
The anti-lock braking function is automatically enabled whenever the ABS modulator is in the normal braking mode.
While the anti-lock braking function is enabled, if the ABS ECU detects a wheel decelerating faster than the average,
indicating it is about to lock, it operates the ABS modulator in the ABS braking mode for the affected wheel.
ABS ECU Connector Pin Details (Up To 2002 MY)
Pin No.
Description
Input/Output
1
System earth
–
2
Front LH ABS sensor
Input
3
Front LH ABS sensor
Input
4
Not used
–
5
Rear RH ABS sensor
Input
6
Rear RH ABS sensor
Input
7
Not used
–
8
ISO 9141 K line
Input/Output
9
Accelerometer supply
Output
10
Accelerometer earth
–
11
Brake switch (BTS contacts)
Input
12
Ignition power supply
Input
13 and 14
Not used
–
15
Battery power supply
Input
16
CAN bus 1 low (connection with instrument pack)
Input/Output
17
CAN bus 1 high (connection with instrument pack)
Input/Output
18
Brake switch (BLS contacts)
Input
19
Road speed signal
Output
20
Not used
–
21
Accelerometer signal
Input
22 to 27
Not used
–
28
Hill descent switch
Input
29
System earth
–
30
Front RH ABS sensor
Input
31
Front RH ABS sensor
Input
32
Not used
–
33
Rear LH ABS sensor
Input
34
Rear LH ABS sensor
Input