1998 JAGUAR X308 Fuse box

Vehicle Dynamic Suspension - Vehicle Dynamic Suspension
Diagn
osis and Testing
Refer to the PDU User Guide for details of diagnosing and testing the Adaptive Damping System. The PDU interrogates the
ADCM directly via the K and L lines to the J1962 diagnostic socket.
The PDU will give an indication of the integrity of each electron ic and electrical component. It will indicate, for example, that
the accelerometers are not broken, but not that they functionin g correctly when the vehicle is in motion. However, it is
exceptional for an accelero meter to function incorrectly in its dynamic mode if it is proved to be functioning when static.
Basic Checks
The accele
rometers have the following ch
aracteristics. At 0g (no movement of the body) each vertical accelerometer
outputs approximately 2.5V steady voltage; the lateral acce lerometer outputs approximately 1.5V. The voltage output due
to body movement is proportional to acceleration in the acceleration axis, up to approximately 4.5V and down to
approximately 0.5V.
Before changing any component, refer to the circuit diagrams and check the cont inuity of relevant harness circuits; in some
instances, the PDU will not different iate between a faulty component an d a damaged connection or wiring.
Check the following fuses:
En
gine compartment fuse
box, fuse F5 (10A).
Engine m
anagement fuse
box, fuse F1 (20A).
Check the following ADCM input/output lines:
Sy stem erro
r output from the ADCM
to the instrument cluster.
Vehicl
e speed output from the inst
rument cluster to the ADCM.
Foo
tbrake signal to the ADCM.
Check any relevant connections to confirm that the connection is electrically sound and that a terminal pin has not been
pushed back into the connector shell, ie. not ma king a connection to its mating pin or socket.

It e
m
Par
t
Number
De
scr
iption
1—ABS /
T
CCM
2—E
n
gine compartment fuse-box
3—TCM (supercha
r
ged)
4—ECM

5—TCM (n ormally
aspirated)
6—Left rear
w
heel speed sensor
7—Ri
ght
rear wheel speed sensor

Pinpoint tests

W
S
S circuit: short
circuit to power
WSS f
ailure
C1
175Left -hand re
ar wheel speed
sensor (WSS) circuit failure
W S
S circuit: open
circuit
WS
S circuit: short
circuit to ground
W S
S circuit: short
circuit to power
WSS f
ailure
F
or l
eft-hand rear WSS test
s. GO to Pinpoint Test E.
C1267Modulat or valv
e failure
Supply volt
ages
to valve
solenoids or sensors out of range
Fo
r power and ground tests. GO to Pinpoint Test
A.
B1342CAN co
mmunication circuit
failure
CAN :
open circuit fault

CAN:
short circuit to
ground
CAN :
short circuit to
power
Fo
r CAN tests. GO to Pinpoint Test
F.
B1676Supply volt
age out of range
Supply voltage:
too
low
Supply volt age:
too
high
Check fo
r DTCs indicating a charging system fault.
Rectify as necesssary.
PI
NPOINT TEST A : MODULE
POWER AND GROUND SUPPLIES
TES
T
CONDITIONS
D E
TAILS/RESULTS/ACTIONS
A
1
: CHECK THE POWER SUPPLY FUSES
Make sure the igniti
on is turned off. 1
Chec
k fuses 04, 16 and 18 of the engine compartment junction box.
2
Are th
e fus
es in good condition?
Yes GO to A2
.
No
Install a new f
use as
necessary. Check the syst em for normal operation. If the fuse fails again,
check the circuit for a short circuit to ground. Refer to the electrical guides.
A2: CHECK THE PERMANENT
POWER SUPPLY (1) TO THE MODULE
Disc

onnect the ABS module connector, LF27.
1
Measure the voltage between LF
2
7, pin 09 (NR) and ground.
2
Is the vol
t
age greater than 10 volts?
Yes GO to A3
.
No Re
pair the circuit between the engine compartment
junction box, fuse 16, and LF27 pin 09. Refer to
the electrical guides. Clear the DTC, check for normal operation.
A3: CHECK THE PERMANENT
POWER SUPPLY (2) TO THE MODULE
Meas
ure t
he voltage between LF27, pin 25 (NW) and ground.
1
Is the vol
t
age greater than 10 volts?
Yes GO to A4
.
No
Re
pair the circuit between the engine compartment ju
nction box, fuse 18, and LF27 pin 25. Refer to
the electrical guides. Clear the DTC, check for normal operation.
A4: CHECK
THE IGNITION POWER SUPPLY TO THE MODULE
Make sure the ignition is on. 1
Measure the
voltage between LF 2
7, pin 20 (WU) and ground.
2
Is the vol
t
age greater than 10 volts?
Yes GO to A5
.
No Re
pair the circuit between the engine compartment ju
nction box, fuse 04, and LF27 pin 20. Refer to
the electrical guides. Clear the DTC, check for normal operation.
A5: CHECK
THE GROUND SUPPLY TO THE MODULE

The fluid reservo
ir:
Is lo

cated in the engine compartment, mounted on the engine compartment fuse box bracket.
Incorporates

a 10 micron, li
fetime, integral filter.
Has a cap
acity of 0.4 liter.
Has a dipsti

ck incorporated into the filler cap for checking the fluid level.
A new reservoir must be fitted if the steering rack, pump or fluid cooler are renewed.
Fluid C
ooler

P
arts List
The fluid cooler:
Is
resiliently mounted on th
e front body cross member.
Coo
ls the fluid before it is
returned to the reservoir.
Is
of the wire-bound tube type.
Has i

ntegral hoses.
Supply and Return Hoses a

nd Pipework
The supply and return h
oses and
pipework deliver fluid at high pressure from the pump to th e steering rack assembly. The
fluid is then returned to th e reservoir through the cooler tube. The high pressure supply hose contains two cable-type
attenuators, one at each end, to reduce nois e. The return pipe is clipped to the steering rack housing by a resilient
mounting.
It
em
Par
t Number
De
scription
1—Fl

uid reservoir
2—Supply line
3—R

eturn line
4—Fi

ller cap
It

em
Par
t Number
De
scription
1—Front body cross member
2—F

luid cooler
3—Inte

gral hoses
4—Cooler m

ounting


P
arts List

DO NOT DRIVE THE VEHICLE WITH THE TEST EQUIPMENT INSTALLED.
With the control valve CLOSED the pump maximum output pressure can be checked.
Remov
ing Test Equipment
T
o remove the test equipment:
Install a hose clamp

on the
reservoir to pump hose.
Re
moving the test equipmen
t is a reversal of the installation instructions.
Install a new O-r
ing to the PAS pump high
pressure outlet to hose connection.
Inst
all the original hose to the PAS pump.
R

emove the clamp from the reservoir to pump hose.
Top-up the reservoi

r fluid.
B

leed the PAS system; refe
r to this section.
Refer to PDU
User Guide
T
he PDU will diagnose all electrical components of the system.
Before changing a component, chec k fuse No. 12 (10A) in the left-hand heelboard fu se box. However, if this fuse is faulty a
number of other components wi ll also fail to function.

ItemPar
t Number
De
scription
1—Lug

gage compartment fuse box
2—I

ntercooler pump relay
3—I

ntercooler pump
4—Electr

onic control module

Conne
ct the scan tool
1
Have the DTC(s) and fr

eeze
frame data been recorded?
Yes GO to D2
D
2: CHECK FUSE
•

NOTE: See further steps for poss
ible cause of fuse failure.
Chec
k fuse F2 integrity (located in the engine
management fuse box).
1
OK
?
Yes GO to D3
No Renew fuse and test the syst em for normal operation.
D3: C
HECK RELAY SOCKET SUPPLY VOLTAGE
•

NOTE: Do not replace relay.

Ci
rcuit references to injectors:
'A' refers to bank 1;
'B' refers to bank 2.
Fuel C
harging and Controls - Supercharged Vehicles
Ci
rcuit Diagram, Fuel Injection
System - Supercharged Vehicles
It
em
Par
t Number
De
scription
1—E

ngine compartment fuse-box
2—Engine

management fuse-box
3—Splice

- 12V to
other circuits
4—PI m
ain relay
5—Engine

control module (ECM)
6—Fue

l injector 1A - other injectors similar