Jaguar XJ (X350). Manual — part 271
Description and operation
Steering System
The power steering system is a rack and pinion design, with an engine-driven pump providing
the steering assistance. The system features variable steering assistance with vehicle speed
and a variable ratio steering rack.
Absolute cleanliness must be observed when replenishing the fluid or dismantling any part of
the system. New fluid from a sealed container must be used.
NOTE:
If the steering gear, pump or cooler are being replaced for leakage or noise related issues
and there is no evidence of fluid contamination, there is no need to replace the reservoir.
In some cases where the fluid clearly contains particulate matter, and the system continues to
function, flush the system with fresh fluid and replace the reservoir, as there is the possibility
that the reservoir internal filter may be damaged or faulty.
Diagnosis and testing
Steering System
Inspection and Verification
1 . Verify the customer concern by driving the vehicle.
2 . Visually inspect for obvious signs of mechanical or electrical damage.
Mechanical Checks
•
Incorrect tire pressure, loose wheel nuts, incorrect wheel alignment
•
Loose tie-rods
•
Loose damper and spring assemblies or ball joint
•
Loose steering column shaft universal joints
•
Loose pinch bolts on steering column shaft
•
Loose steering gear assembly
•
Check for external damage to the steering gear. Damaged tie-rods
CAUTION: If a steering gear assembly is returned under warranty with leaking seals, but
there is also damage to the steering gear boot/boots the steering gear warranty will be invalid.
This is due to the steering gear seals being damaged due to foreign materials entering the steering
gear boot and damaging the steering gear seals thereafter.
•
Damaged steering gear boot
•
Damaged accessory drive belt
•
Binding or misaligned steering column, pump or steering gear
•
Incorrect fluid level
•
Hose leaks or line restrictions
•
Hose fouling bodywork
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Electrical Checks/Tests
•
Make sure all connectors are in place (steering gear Servotronic solenoid and steering control
module (SCM) - if applicable)
•
Make sure all the fuses are in place and not blown
•
DISCONNECT the steering gear transducer and the steering should become heavy
•
TEST electrical values: Power Supply to the SCM = 12 Volts Steering gear transducer
resistance 7.0 to 7.5 Ohms is normal Steering gear transducer voltage = 6 Volts Steering gear
transducer current = 840 mA at 0 mph reducing to 0 mA at maximum speed
•
RECONNECT all electrical items disturbed during testing
3 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)
before proceeding to the next step.
4 . Check the power steering fluid condition. For additional information, REFER to Power Steering
Fluid Condition Check in this section.
5 . If the concern is not visually evident, verify the symptom and REFER to Steering Fault Diagnosis by
Symptom Charts in this section.
Steering Relay Harness Connector
1
Steering transducer ground
2
Ignition feed
3
Steering transducer feed
4
Ground
5
Speed sensor signal
6
Serial interface
Steering Linkage Inspection and Backlash (Freeplay) Check
CAUTION: Steering gear boots must be handled carefully to avoid damage. Use new clamps
when installing steering gear boots.
Inspect the boots for cuts, deterioration, twisting or distortion. Check the steering gear boots to
make sure they are tight. Install new boots or clamps as necessary.
NOTE:
The following steps must be carried out with assistance.
1 . With the wheels in the straight ahead position, gently turn the steering wheel to the left and the
right to check for free play.
2 . Free play should be between 0 and 6 mm (0 and 0.24 in) at the steering wheel rim. If the free play
exceeds this limit, either the ball joints are worn, the lower steering column joints are worn or the
backlash of the steering gear is excessive.
CAUTION: DO NOT attempt to adjust the steering gear yoke. Failure to follow this
instruction will result in the steering gear warranty to become invalid.
3 . The backlash of the steering gear cannot be adjusted, install a new steering gear. For additional
information,
4 . Grasp the steering wheel firmly and move it up and down and to the left and right without turning
the wheel to check for column bearing wear, steering wheel or steering column. For additional
information,
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Description
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