ABS warning light illuminated

ABS WARNING LIGHT ILLUMINATED

Model

Discovery Series II

Affected vehicles

All derivatives within VIN ranges: XA 900012 to 907212 - (System 1) XA 200412 to 204130 - (System 2)

Date

1999-11-17

Reference

Bulletin 0005, CDS ref L8559bu

Bulletin text

Discovery Series II

AFFECTED RANGE:

All derivatives within VIN ranges: XA 900012 to 907212 - (System 1) XA 200412 to 204130 - (System 2)

PROBLEM:

ABS WARNING LIGHT ILLUMINATED The customer reports seeing the ABS warning light illuminated and may also report hearing the three chimes warning sound.

CAUSE:

Signals detected within the ABS system have been interpreted as faults.

ACTION:

Where a customer has reported seeing ABS warning light illumination, TestBook must be used to establish whether a fault code has been stored within the SLABS ECU. The appropriate checks as described below must then be carried out.

Refer also to the Workshop Manual Brakes Section - Operation - Diagnostics .

In case of the following Fault Code being detected, carry out the checks below:

FAULT CODE DESCRIPTION 11.3 Modulator shuttle valve switch dynamic failure

Master cylinder functionality • ABS modulator earth connection • ABS ECU earth connection • Modulator shuttle valve switches functionality •

If no fault can be identified, confirm the SLABS ECU Channel Mask and Safety Mask Numbers by carrying out the following procedure using TestBook:

Select: DISCOVERY SERIES II - SLS & ABS - VEHICLE MAINTENANCE - ECU INFORMATION • Near the bottom of the on-screen list, the ECU Channel Mask and Safety Mask Numbers can be found. If these are Number 2 or 3, replace the ECU with new ECU, part number SRD100462.

Bulletin N o : 0005 L8559bu 1 17.11.99

In case of the following Fault Codes being detected, carry out the checks below:

04.4 to 04.7 Sensor output too low - insufficient 06.4 to 06.7 Sensor electrical failure 08.4 to 08.7 Sensor electrical connection intermittent

ABS wheel speed sensor output • ABS wheel speed sensor electrical resistance • ABS wheel speed sensor cable and connector for integrity and correct route. • If no fault can be identified, confirm the SLABS ECU Channel Mask and Safety Mask Numbers by carrying out the following procedure using TestBook: Select: DISCOVERY SERIES II - SLS & ABS - VEHICLE MAINTENANCE - ECU INFORMATION • Near the bottom of the on-screen list, the ECU Channel Mask and Safety Mask Numbers can be found. If these are Number 2 or 3, replace the ECU with new ECU, part number SRD100462.

In case of the following Fault Codes being detected, carry out the check below:

01.3 Pump not running when activated 01.4 Pump failure - sticking

Confirm the ABS relay part number. If AMR5293 is fitted, replace with • YWB101300.

In case of the following Fault Code being detected, carry out the checks below:

01.5 Pump failure - pump running when not activated

Confirm the ABS relay part number. If • AMR5293 is fitted, replace YWB101300. Establish from the customer whether a • sustained noise similar to ABS or Hill Decent Control operation was heard, possibly even with the ignition turned off. Unless it can be confirmed that ‘Pump running when not activated’ time was limited to less than 0.5 hour, replace the ABS modulator. Should Fault Codes other than described above be detected, follow further diagnostics as prompted by TestBook. Refer to Workshop Manual repair number 70.65.30 for the ECU replacement procedure. Having fitted a new ECU, it must calibrated using TestBook as described below.

with

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be

• From TestBook, select SLABS diagnostics. • Follow the on screen instructions to select ‘VEHICLE MAINTENANCE’. • From ‘VEHICLE MAINTENANCE’, select ‘SLABS ECU REPLACE’ and follow instructions with the exception of ‘ENTER ORIGINAL ECU NUMBER’. At this point, enter the full VIN. TestBook will also request confirmation of whether vehicle has self levelling (SLS) or coil sprung rear suspension. • Follow the on-screen instructions to return to ‘VEHICLE MAINTENANCE’. • Select ‘HEALTH CHECK’ and follow instructions to test and cancel warning lights. NOTE: When the ‘WHEEL ASSIGNMENT’ screen is reached, it will be necessary to raise each road wheel clear of the ground / ramp individually, so that the wheel can be rotated. During this operation it is essential that the other three road wheels are restrained to prevent movement via the differential. • Close TestBook to ‘WELCOME’ screen. • For vehicles with SLS, on completion CALIBRATION’ as prompted and follow on-screen instructions to complete calibration.

PARTS INFORMATION:

USE ONLY AS REQUIRED

ECU - Self levelling suspension and anti-lock braking system Relay - ABS pump

WARRANTY CLAIMS: Use Complaint Code: 7N8Y Use S.R.O.: 70.90.89/26 Carry out preliminary electrical and mechanical checks using TestBook as required Time allowance: 0.30Hrs Use S.R.O.: 70.65.04 Relay - pump - renew Time allowance: 0.10Hrs Use S.R.O.: 70.65.01 SLABS ECU - renew and calibrate Time allowance: 1.50Hrs NOTE: This is an increased time for ECU renew from that previously published and includes an allowance for calibrating the new ECU using TestBook. An additional TestBook operation for calibration is therefore not required. Any additional repairs carried out as the result of problems identified during the diagnostic procedure should be claimed in the usual way, referring to the Repair Operation Times Manual for relevant SRO details.

of ‘HEALTH CHECK’, go to ‘SLS

Old Part No New Part No

SRD100461 SRD100462

AMR5293 YWB101300