steering JAGUAR X308 1998 2.G Service Manual

P
INPOINT TEST A : BRAKES NOISY
TE
ST
CONDITIONS
D
ETAILS/RESULTS/ACTIONS
A1

: INSPECT BRAKE PADS
Inspect the condi

tion of the front and rear brake
pads. Check for damage to any anti-squeal shims.
1
Are th
e brake pads OK?
Yes GO to A2
.
No

CLEAN the front brake pads or INSTALL new front brak e pads if necessary. For additional information,
refer toSection 206
-03
Front Disc Brake
. CLEA
N the rear brake pads or INSTALL new rear brake pads
if necessary. For additional information, refer toSection 206
-0
4 Rear Disc Brake
.
Test vehicle for
presence of brake squeal.
A2
: INSPECT BRAKE DISCS
Inspe

ct the brake discs for excessive corrosi
on, wear or disc thickness variation.
1
D
oes excessive corrosion, wear or
disc thickness variation exist?
REFER to Specification
- in t
his section.
Yes INSTALL new front brake discs and brake pads. For additional information, refer toSection 206
-03

Fr

ont Disc Brake
. INSTALL n
ew rear brake discs and brake
pads. For additional information, refer
toSection 206
-0
4 Rear Disc Brake
. TEST
the system for normal operation.
No Vehicle is OK.
P
INPOINT TEST B : VIBRATIO
N WHEN BRAKES ARE APPLIED
TE
ST
CONDITIONS
D
ETAILS/RESULTS/ACTIONS
B1

: ROAD TEST VEHICLE
R

oad test the vehicle between 40-80 km/h (25-50 mph) without applying brakes.
1
Is th

e vibration present?
Yes TEST for noise vibration and harshness. REPEAT road test if necessary.
No GO to B2
. .

B2

: CHECK FOR BRAKE VIBRATION
R

oad test the vehicle between 40-80 km/h (25-50
mph) with light and medium application on the
brake pedal.
1
Is a vibration
present?
Yes If the vibration is from the front of the vehicle GO to B3
. If
the vibration is
from the rear of the
vehicle or can not be di agnosed between front or rear of the vehicle GO to B6
.
No

Vehicle is OK.
B3: CHECK
THE SUSPENSION
AND STEERING COMPONENTS
Chec
k the condition of the front susp
ension bushes and ball joints
REFER to Section 204
-01
Front Suspension
.
Chec
k the condition of the steering linkage components
REFER to Section 211
-0
2 Power Steering
/

211
-0
3 Steering Linkage
.
1
D

o any of the front suspension components or steering comp
onents require replacement?
Yes INSTALL new components as necessary
REFER to Section 204
-01
Front Suspension
/

211
-0
2 Power Steering
/

211
-0
3 Steering Linkage
.
R
oad test the vehicle between 40-80 km/h (25-50
mph) with light and medium application on the
brake pedal. If vibr ation still exists GO to B4
.
No

GO to B4
.
B4: CHECK
THE FRONT BRAKE PA
DS AND FRONT BRAKE DISCS
Chec
k the condition of the front br
ake pads and front brake discs.
1
D
oes excessive brake disc runout or br
ake disc thickness variation exist?

hub are critical to achieve correct clearan
ce and operation of
the brakes. Therefore special vertical links and hubs set within
a certain tolerance are inst alled with Brembo brakes.
The front discs are handed and must be fitt ed to the correct side of the vehicle. The left-hand disc can be identified by a
groove running around the circumference of the outer disc wall as shown in the illustration below.
Left hand disc - identification mark

Modified disc shields are installed to accommodate the larger diameter discs.
The four cylinder brake caliper is rigidly attached to the vert ical link via an anchor bracket. The caliper is a split assembly
with each side of the caliper, housing two pistons. The two-pairs of opposed pistons act direct ly on the brake pads mounted
one each side of the disc.
Stainless steel hydraulic hoses connect the calipers to the existi ng brake tubes. It is important that these hoses are aligned
correctly when installed to pr event them fouling on the steering and suspen sion components. Refer to operation 70.55.24
for information.
The Brembo disc brakes require no adjustment.

Stai
nless steel hydraulic hoses connect the calipers to the existi
ng brake tubes. It is important that these hoses are aligned
correctly when installed to pr event them fouling on the steering and suspen sion components. Refer to operation 70.55.25
for information.
The Brembo disc brakes require no adjustment.

i
nstalled to prevent it fouling on the steering and suspension
components.
After installation the brake ho se must be aligned with the
center line as shown.

4. Install brake hose to
caliper.
Remove plugs f

rom caliper and hose.
Inst

all new sealing washers.
Align hos

e as shown above.
Install and tigh

ten union bolt to 22-26 Nm.
5. Remove special tool from brake pedal.
6. Fit wheels. Refer to operation 74.20.05.
7. NOTE: Make sure the brake hose is routed correctly.
Remove stands and lower vehicl e. Refer to section 100-02.
8. Bleed brake hydraulic system. Refer to operation 70.25.06.

Stee
ring System - General Information -
S
teering Linkage Specifications
Power Steering Pump Specifications
Lubricants, Fluids, Sealers and Adhesives


S
teering Linkage Free Play
Meas
urement (mm)
Meas
urement (in)
F

ree play (measured at
the steering wheel rim)
0-
6
0
-0.24
It

em
S
pecification
Power steeri

ng pump relief pressure
10
6-114 bar
It

em
S
pecification
Power steeri

ng fluid
De
xtron 3

Steering System - General Information - Steering System
Description and Operation

Details of the Steering System can be found in sections 211-02, 211-03, 211-04 and 211-05.

Steering System - General Inform
ation - Steering System
D
iagnosis and Testing
I

nspection and Verification
1.
1. Verify t
he customer concern by driving the vehicle.
2. 2. Visually inspect for obvious signs of mechanical or electrical damage.
Mec
hanical Inspection Chart
Electrical Inspection Chart
Mechanical Checks
Incorrect
tire pressure, loose whee
l nuts, incorrect wheel alignment
Loose ti
e-rods
Loose dam

per and spring assemblies or ball joint
Loose s

teering column shaft universal joints
Loose pinc

h bolts on steering column shaft
Loose steeri

ng gear assembly
Check f

or external damage to the steering gear.
- Damaged tie-rods
-
CAUTION: If a steering gear assemb ly 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 fore ign materials entering the steering gear boot and damaging the steering
gear seals thereafter.
Damaged steering gear boot
Damaged accessory driv
e belt
Bin

ding or misaligned steering co
lumn, pump or steering gear
Incorrect fluid
level
Hose leaks o

r line restrictions
Hose fou

ling bodywork
El

ectrical Checks/Tests
Make sure all

connectors are in plac
e (steering gear Servotronic solenoid and steering control module (SCM) - if
applicable)
Make su
re all the fuses are in place and not blown
D

ISCONNECT the steering gear transducer
and the steering should become heavy
TEST e
lectrical values:
- Power Supply to the SCM = 12 Volts
- Steering gear transducer resist ance 7.0 to 7.5 Ohms is normal
(
limits: less than 5 Ohms and greater than 9 Ohms would

be declared unacceptable)

- Steeri
ng gear transducer voltage = 6 Volts
- Steering gear transducer cu rrent = 840 mA at 0 mph reducing to 0 mA at maximum speed

3.3. If an obvi
ous cause for an observed or
reported concern is found, correct th e cause (if possible) before proceeding
to the next step.
4. 4. Check the power steering fluid condit ion. For additional information, REFER to Power Steering Fluid Condition
Check in this section.
5. 5. If the concern is not visually evid ent, verify the symptom and REFER to Steering Fault Diagnosis by Symptom
Charts in this section.
Steering Re
lay Harness Connector

Stee
ring Linkage In
spection and Backlash (Freeplay) Check
CAUTIO

N: Steering gear boots must be
handled carefully to avoid damage. Use new clamps when installing steering
gear boots.
Inspect the boots for cuts, deterioration, tw isting or distortion. Check the steering gear boots to make sure they are tight.
Install new boots or clamps as necessary.
REC O
NNECT all electrical item
s disturbed during testing
Ite
m
De
scr
iption
1Ste
e
rin
g tran
sduc
er
ground
2Igni
ti
on feed
3Steeri
ng transducer feed
4Ground
5Speed s
ensor signal
6Seri
a
l interface

•
NOTE: The following steps must be carried out with assistance.
1. 1. With the wheels in the straight ahead po sition, gently turn the steering wheel to the left and the right to check for
free play.
2. 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 stee ring gear yoke. Failure to follow this instruction will result in the steering
gear warranty to become invalid.
3. 3. The backlash of the steering gear cannot be adjusted, in stall a new steering gear. For additional information,
REFER to Section 211
-0
2 Power Steering
.
4. 4. Grasp the steering wheel
firm
ly 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,
REFER to Section 211
-0
4 Steering Column
.
Power Steering Fluid Condition Check
1.
1. R
un the engine for 2 minutes.
2. 2. Check the power steering fluid system level.
3. 3. Observe the color and the odor. The color under normal circumstances should be dark reddish, not brown or
black.
4. 4. Allow the fluid to drip onto a faci al tissue and examine the stain.
5. 5. If evidence of solid material is foun d, the power steering fluid system should be drained for further inspection.
6. 6. If fluid contamination or steering co mponent failure is confirmed by the se diment in the power steering fluid
system, REFER to Steering Fault Diagnosis by Symptom Charts in this section.
Power Steer
ing Pressure Test
Test Equ
ipment

It
em
S
pecial Tool Number
De
scription
12

11-011
Pres
sure Gauge Hose
221

1-011-08
Pump Return Hose
321

1-011-07
Pump Return Hose Connector
42

11-011-03/2
Test Equ
ipment to High
Pressure Hose Adaptor

The
measurement of the maximum system pressure, (which is
governed by the pressure relief valve) is achieved by
inserting the Service Tool (pressure gauge and adaptors) into th e fluid circuit of the power steering system. Run the engine
at idle speed, turn the st eering from lock to lock and read the ma ximum pressure recorded on the gauge.
Installin
g Test Equipment
To
in
stall the pressure test equipment:
Pla
c
e a suitable drain tray be
low the power steering pump.
Install a hose clamp on
the re
servoir to pump hose prior to disconnecting any hoses, to avoid unnecessary loss of
fluid.
Disc
onnect the hose from the power st
eering pump high pressure outlet.
Install the pu
mp outlet to hose adaptor (5
). Do not omit the 'O' ring seal (9).
Connect the power steering
pump
adaptor to control valve hose (6) of the test equipment.
Install th e adaptor (4) in th
e high
pressure hose previously removed from the power steering pump outlet.
Conn
ect the connector (3) of the test equipment hose (2) to the adaptor (4).
R
e
move the hose clamp fro
m the reservoir hose.
Start th
e engine.
With the control valve (7) OPEN and the engine idli ng, the following system pressures may be checked:
Du
ring turning.
W
h
en the steering is
held on full lock.
With
the steeri
ng at rest.
• CAUTIONS:
To avoid excessive heating of the po wer steering pump, do not close the valve for longer than 5 seconds maximum.
Do not drive the vehicle with the test equipment installed.
With the control valve (7) CLOSED the power steering pump maximum ou tput pressure can be checked.
Removing Test Equipment
To
remove the test equipment:
Install a hose clamp
on
the reservoir to power steering pump hose.
Re
movi
ng the test equipmen
t is a reversal of the in stallation instructions.
Install a new '
O
' ring seal (9) to the power steering pump high pressu
re outlet to hose connection.
Instal
l the original hose to
the power steering pump.
Re
move the clamp from the reservoir to
the power steering pump hose.
Top-up the reservoir flui
d.
Ble
e
d the power steerin
g system. For additional information,
REFER to Power Steering System Bleeding
- in thi
s section.
Stee
ring Fault Diagnosis by Sympt
om Charts
Leakage
52
11-0
11-03/1
Pump High Pressure Ou
tlet
to Hose Adaptor
621
1
-011-02
Pump Adaptor
to Contro
l Valve Hose
721
1
-011-01
Control Valve
82
11-
011
Pressure Gauge
9-'O
'
Ring Seal
Cond
iti
on
Possib
l
e Sources
Acti
o
n
Co
nfirm
the position of the fluid
leak.
CLEAN th
e area of the leak.
In
s
pect the area and confirm the exact position of leak.
Make sure the fluid
is not from anoth
er system on
the vehicle.