SSM71278

TOPix - SSM71278 - Vehicle Steering Feels Heavier than expected
Reference
SSM71278
Models
Discovery Sport / L550
Page 1 of 2
Range Rover / L405
Range Rover Evoque / L538
Range Rover Sport / L494
Title
Vehicle Steering Feels Heavier than expected
Category
Chassis
Last modified
02-Dec-2015 00:00:00
Symptom
303000 Steering/Handling
Attachments
11 Ground Points.pdf (11 Ground Points.pdf)
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 I 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.
-Wiring harness issue (short/ open circuit, high resistance).
-High resistance at EPAS earth terminal (for L405/L494) G1D132 and or G4D178, (see
attached diagram). Or if on L550/L538 high resistance at G1 D122A, G1 D122B,
G1D122AZ and G1D108.
Action:
-Using SOD please check the CHCM and EPAS for any OTC
-Confirm the vehicle battery condition is OK
-Confirm ignition and main feed fuses are secure.
-Check and clean the following earth terminals L405/L494:G1D132 & G4D178
L550/L538: G1 D122A, G1 D122B, G1 D122AZ and G1 D108. Replace the washer if
http://topix.landrover.jlrext.com/topix/service/archive/599703/index
1/5/2016
TOPix - SSM71278 - Vehicle Steering Feels Heavier than expected
Page 2 of 2
found to be corroded and re-tighten retaining fixings.
-Refer to the electrical circuit diagrams (211.02 in TOPlx) and check the power steering
control module power feed circuit for short circuit to ground, open circuit, high
resistance.
http://topix.landrover.jlrext.com/topix/service/archive/599703/index
1/5/2016