Range Rover Sport (LS) V8-4.2L SC (2006)
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Suspension Control Module: Customer Interest
Suspension - Front/Rear Undercar Shudder
No.: LTB00029
Issue: 2
Date: 16 April 2008
THIS BULLETIN SUPERCEDES LTB00029, ISSUED 08 FEB 2007. CHANGES ARE SHOWN WITH GRAY HIGHLIGHTS IN THE IMAGES.
Section: 204
RIDE AND HANDLING OPTIMIZATION SYSTEM SHUDDER - REPAIR PROCEDURE
AFFECTED VEHICLE RANGE
CONDITION SUMMARY:
'SHUDDER' FELT OR RAPID 'PULSING' NOISE HEARD FROM UNDER THE VEHICLE
Situation:
A customer may report a concern of an under-car 'shudder' from the front or rear suspension, or an under-car rapid 'pulsing' noise heard from the
dynamic response valve block or hydraulic tubing. The shudder may continue as long as the driving conditions that created the shudder remain constant,
or the shudder may subside, typically in less than five seconds.
Certain driving situations that are most commonly known to cause the concern are as follows:
^
From single wheel inputs as follows:
^
When speed bumps are traversed at an angle
^
Over small step changes in a road surface, such as driveway entrances, broken road surfaces etc.
^
From specific road design and vehicle driving styles as follows:
^
When the vehicle is cornering at a speed between 6 mph (10 kph) to 19 mph (30 kph)
^
Where the road has a significant camber
^
When the steering wheel angle is greater than +/- 10 degrees
^
When the steering wheel angle is held constant for approximately 2 seconds during the turn where the road surface is not perfectly smooth.
The Dynamic Response system control software performs an inaccurate estimation of the road surface conditions, resulting in overcompensation for what
it perceives as very small changes in vehicle direction. This overcompensation causes fluctuations in the control pressure delivered to the stabilizer bar
actuators producing the shudder.
Action:
Should a customer report a concern regarding the above, refer to the Repair Procedure detailed in this bulletin to update the Dynamic Response system
control module software.
PARTS
No parts required
TOOLS
