Steering/Suspension - Tires Wearing Unevenly
No.: LS204-008Issue: 3
Date: May 22, 2007
SECTION: 204-00
Uneven Tire Wear
AFFECTED VEHICLE RANGE:
Range Rover Sport (LS) VIN: 6A900129 to 6A970174
CHANGES MADE FOR ISSUE "3" ARE HIGHLIGHTED WITH GRAY BACKGROUND
CONDITION SUMMARY:
UNEVEN TIRE WEAR
Situation:
A customer may report a concern of uneven tire wear. The steering alignment geometry of certain vehicles may experience some bushing settlement during early vehicle life. Following initial production geometry setting, this settling may alter the geometry settings outside of normal tolerance which may in turn increase tire wear.
Revised initial geometry settings introduced after 6A970174 compensate for this situation.
NOTE:
This situation is not experienced on all vehicles. Toe sensitivity may be attributed to other factors.
CAUTION:
Retailers who sublet alignment to outside shops must provide the information in this bulletin to the alignment facility to ensure proper settings when uneven tire wear symptoms are being addressed. Additionally all vehicles sent for sublet alignment MUST have been placed in the "tight tolerance" geometry setting mode prior to delivery using IDS.
Action:
Should a customer express a specific concern of uneven tire wear, refer to the Repair Procedure detailed in this bulletin to adjust the vehicle geometry to the "target" settings noted below.
NOTE:
In other situations requiring geometry adjustment, where a specific concern of uneven tire wear is not expressed or diagnosed, the geometry dimensions in the workshop manual should be used. A specific set of "target" geometry data is provided in this bulletin for use in vehicles where the geometry needs to be adjusted to correct an uneven tire wear concern.
PARTS:
No parts required
WARRANTY:
NOTE:
Repair procedures are under constant review, and therefore times are subject to change; those quoted must be taken as guidance only. Always refer to DDW to obtain the latest repair time.
NOTE:
The revision to the time in this bulletin is the result of the introduction of the new IDS "tight tolerance" geometry setting mode for suspension adjustments. This simple IDS process replaces and eliminates the requirement to perform a suspension calibration (1.1 hrs) in association with the alignment process. Refer to Technical Bulletin LS204-O10 for additional information about the geometry setting mode.
DDW requires the use of causal part numbers.
Labor only claims must show the causal part number with a quantity of zero.
REPAIR PROCEDURE
ALIGN SUSPENSION GEOMETRY
1. Refer to Technical Bulletin LS204-O10, connect IDS to the vehicle and place the Electronic Air Suspension (EAS), into "tight tolerance" geometry setting mode.
NOTE:
Vehicles that have any of the front or rear, upper or lower control arm bushings changed must complete a ten mile road test before having the geometry checked and adjusted if necessary. The road test will allow the suspension to settle.
NOTE:
GTR lookup sequence is as follows:
GTR Home> NAS > Service Information/ LS - Range Rover Sport > Workshop Manuals> Bookmark "Chassis/Suspension/204-00: Suspension System - General Information" link "Four - Wheel Alignment (57.65.04)"
CAUTION:
GTR identifies an alignment specification range.
The exact "TARGET SPECIFICATION" in the table shown should be used on vehicles that have experienced uneven tire wear.
When setting suspension geometry after front or rear/upper or lower control arm bushing replacement, the rear toe should be set to the TARGET SPECIFICATION in the table.
2. Refer to GTR section 204-00 Four-Wheel Alignment operation 57.65.04 and adjust the front and rear wheel alignment to the TARGET specification figures noted in the table.
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