1998 JAGUAR X308 throttle

Speed Control - Speed
Control
D
iagn
osis and Testing
Pri
n
ciples of operation
The s
p
eed (cruise) control sy
stem is activated by an ON/OFF master switch in the J-gate surround, which has an integral
LED to indicate status.
The steering wheel switches allow the driver to set the speed, increase or decrease the selected speed, cancel and resume
the facility without his/her hand ever leaving the steering wheel
The vehicle speed can be increased an d decreased in increments of 2 kmh (1 mph) by briefly pressing the + or - buttons up
to a maximum of five times.
Alternatively, the + or - button can be held until th e desired speed is reached.
The selected speed (by whichever method) w ill be displayed in the message center.
The system will not function at speeds below 26 kmh (16 mph), and can be cancelled from the master switch, the steering
wheel switches, and by depressing th e brake pedal. The system can be overridden by accelerating as normal.
In
spection and Verification
1.
1. Veri fy the customer concern.
2. 2. Vis
ually inspect for obvious signs of mechanical or electrical damage.
3. 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. 4. If the cause is not visually evident, verify the symptom, check for DTCs and follow the routines in this section.
Vi
sual Inspection Chart
Diagnostic Trouble Code (D
TC) index
MechanicalElectrical
Throttle body mechan
ism
Throttle body actuator
Module Switch(es) Instrument cluster
DTC

De
scr
iption
Possib
l
e Source
Acti
o
n
P0566Speed
c
ontrol
CANCEL
switch ON fault
Speed
control switches internal steering wheel
short circuit to ground
St
eering wheel cassette reel short circuit to
ground
Cassette reel to ECM circ
uit short circuit to
ground
CANCEL
switch failure (stuck ON)
Fo
r

CANCEL switch circuit
tests,GO to Pinpoint Test A.
P0567Speed c
ontrol
RESUME
switch ON fault
Speed
control switches internal steering wheel
short circuit to ground
St
eering wheel cassette reel short circuit to
ground
Cassette reel to ECM circ
uit short circuit to
ground
RESUME swit
ch failure (stuck ON)
For

RESUME switch circuit
tests,GO to Pinpoint Test B.
P0568Spee
d control switch
ground malfunction
Speed
control switches internal steering wheel
open circuit
St
eering wheel cassette reel open circuit or
high resistance
Cassette reel to ECM ci
rcuit open circuit or high

For

ACCEL/DECEL switch circuit
tests,GO to Pinpoint Test C.

Engine Management Fuse Box

Heelboard Fuse Box - Right hand side
Fuse NoRating
(amps)Circuit
120Adaptive damping
215Intercooler water pump (Supercharger)
325Starter solenoid.
45Engine control module.
510Fuel injectors.
65Transmission control module
7-Not used.
810Air conditioning compressor clutch.
930Throttle motor.
105Engine control module, Park/Neutr al switch, cruise control VSV 1 and 2 (where fitted), EGR valves.
11-Not used.
1210Air flowmeter, VVT solenoids.
13-Not used.
1410HO2S sensor heaters (where fitted ), EVAP valve, ignition coils relay, throttle motor relay, AC
compressor clutch relay, radi ator fans control module, CCV.
1530Windscreen left-hand heater.
165Control module compartment cooling fan.
1730Windscreen right-hand heater.
1810Ignition coils, ignition amplifier.
Fuse NoRating (amps)Circuit
120Left-hand seat control module.
215Door lock relay, door locking actuators.
315Body processor module.
410Door mirror heaters, mirror foldback.
55Radio telephone.
610Air conditioning.
720Body processor module (column motor power).
85Rear window switchpack, passenger door switchpack.
95Passenger seat switchpack.

Engine Management Fuse Box Relay

Engine Compartment - Front Relays

Engine and Transmission Control Module Compartment Relays
Relay NoColorCircuit
1BrownEMS control relay
Relay NoColorCircuit
1BlackWindshield wiper fast/slow
2BlackWindshield wiper on/off
Relay NoColorCircuit
1BlueSC coolant water pump
2BrownFuel injection main
3BrownIgnition coils
4BrownThrottle motor
5BrownStarter solenoid
6BrownAir conditioning compressor clutch

9. Slacken and remove two bolts securing throttle cable
adjustment bracket to throttle body.

10. Release locking clips and sl acken and remove the three
screws securing bottom of motor housing to bulkhead.

11. Slacken and remove three bo lts securing top of motor
housing to bulkhead.
12. Holding the purge valve bracket and capillary clear, carefully
withdraw housing complete with motor, and linkage assembly.
13. Remove and discard inner seal from motor spindle.
14. Slacken and remove two nuts and bolts securing motor to
housing and remove motor.

Installation

1.
Position motor in housing and fi t and tighten securing nuts and
bolts.
2. Apply suitable lubricant to bore of new spindle inner seal and
fit seal over motor spindle.
3. Holding the capillary and purge valve clear, position
motor/housing assembly on bulkhead.
4. Seat motor spindle seal correctly in upper plenum aperture and
ensure that housing lo cates on lower studs.
5. Fit and tighten the housin g upper securing bolts.
6. Fit and tighten the housing lower securing screws and slide
locking clips inwards.
7. Position throttle cable adjustment bracket on throttle body and
fit and tighten securing bolts.
8. Position purge valve bracket at bulkhead and fit and tighten
securing bolt and nuts.
9. Position engine harness multiplu g on mounting bracket and fit
and tighten securing nut.
10. Connect motor harness multiplug and locate in retaining clip.
11. Apply suitable lubricant to bore of new outer seal and fit with
washer to motor spindle.
12. Fit and fully tighten collar nut on motor spindle.
13. Fit plenum cover. Refer to 76.10.01.
14. Fit wiper arm and blade. Refer to 84.15.44.90.
15. Fit top covers to LH and RH bulkheads and rear of engine
compartment. refer to 76.11.33 and 76.11.35.
16. Fit ground cable to battery te rminal and cover to battery.
Refer to 86.15.15.

Installation


9. Slacken and remove two bolts securing throttle cable
adjustment bracket to throttle body.

10. Release lower clips and slacken and remove the screws and
upper bolts securing plenum closure panel/wiper motor
assembly to BIW.
11. Guiding wiper spindle through BIW aperture, remove closure
panel/wiper motor assembly from vehicle.

E357931. Ensure that closure panel rubbe r gasket is correctly seated.

E357942. Guiding wiper spindle through BI W aperture, position closure
panel on plenum wall, swivelling motor/linkage assembly on
rubber seat to achieve optimu m spindle to BIW alignment.
3. Fit and tighten securing bolts and screws and slide retaining
clips inwards to lock screws.
4. Position throttle cable adjustment bracket on throttle body and
fit and tighten securing bolts.
5. Position purge valve bracket at bulkhead and fit and tighten
securing bolt and nuts.
6. Position engine harness multiplu g on mounting bracket and fit
and tighten securing nut.
7. Connect motor harness multiplug and locate in retaining clip.
8. Apply suitable lubricant to bore of new outer seal and fit with
washer to motor spindle.