SSM 71278

Special Service Message
NOTE: A Special Service Message is a formal communication issued by Land Rover and carries
the same importance of a Technical Service Bulletin. An SSM is a quick method of
communicating "Need To Know" information to the technical service community. SSM's may
be issued in advance of a technical bulletin or may be the only communication on a given
topic. All information contained in Land Rover technical communications are intended for
use by trained, professional technicians with the knowledge, tools, and equipment required
to complete the procedure correctly and safely. It informs the Technicians of conditions that
may occur on some vehicles, or provides information that could assist in correct vehicle and
diagnostic service.
SSM 71278 - Vehicle Steering Feels Heavy
Models : LG - Range Rover (All
New) - L405
LW - Range Rover Sport
- L494
Engineer Girling Alex
Name :
Last 2 3 - 0 1 - 2 0 1 4 1 3 : 2 4 : 2 9
Modified :
Category : Chassis
Symptom : 303000 Steering/Handling
Content : Issue:
A customer may report the vehicle steering feels heavy
potentially accompanied by visual or audible warnings
through the instrument pack. The following DTCs may
also be logged:
EPAS DTCs logged:
-B1304-16: Electronic Power Assisted Steering (EPAS)
system circuit voltage below threshold
-U3001-00: Power Steering Control Module (PSCM)
system improper shutdown.
These may be accompanied by:
-U0001-87 / 88 High speed CAN bus invalid serial
data received / missing message.
CHCM DTCs logged:
-U0131-00 CHassis Control Module (CHCM) lost
comms with PSCM.
-U3003-62 Battery voltage signal compare failure.
-U0420-68 CHCM invalid data received from PSCM.
Cause:
This may be caused by:
-Low battery voltage.
-Low battery voltage.
-Wiring harness issue (short / open circuit, high
resistance).
-High resistance at EPAS earth terminal G1D132 and or
G4D178, (see attached diagram).
Action:
-Using SDD please check the CHCM and EPAS for any
DTC
-Confirm the vehicle battery condition is OK
-Confirm ignition and main feed fuses are secure.
-Check and clean the earth terminals (G1D132 &
G4D178), replacing the washer if found to be corroded
and re-tighten retaining fixings.
-Refer to the electrical circuit diagrams (211.02 in
TOPIx) and check the power steering control module
power feed circuit for short circuit to ground, open
circuit, high resistance.
File : Ground Points.pdf
Jaguar Land Rover Limited 2000 - 2013 (Rel. 2601)