1998 JAGUAR X308 Workshop Manual

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Page 273 of 2490

JAGUAR X308 1998 2.G Workshop Manual
The
Nivomat ride levelling system improves ride quality by al
lowing the use of softer road springs, while controlling the
effects on the suspension of a fully laden vehicle. The system uses spec

Page 274 of 2490

JAGUAR X308 1998 2.G Workshop Manual A c
ontrol orifice in the pump rod determines the levelling height. When the damper is compressed, this orifice is covered.
When the damper extends, the control orif ice is uncovered, pressure is re

Page 275 of 2490

JAGUAR X308 1998 2.G Workshop Manual R
equire no adjustment and are non-serviceable items.
Accelerometers

The three accelerometers:
Sense veh
icle body movement.
Gen

erate an analogue voltag
e (maximum +5 volts) propor

Page 276 of 2490

JAGUAR X308 1998 2.G Workshop Manual Is hard-wi
red to the instrume
nt cluster message center.
Is hard
-wired to the J1962 diagnostic connector.
Op
era
tion
Th
e
system selects the soft or
firm damper setting according t

Is hard-wi
red to the instrume
nt cluster message center.
Is hard
-wired to the J1962 diagnostic connector.
Op
era
tion
Th
e
system selects the soft or
firm damper setting according to the current ro ad and driving conditions, to optimise vehicle
ride and handling.
With the vehicle stationary, the dampers are in the firm setting, but will normally switch to the soft setting when the vehicle
exceeds 8 km/h (5 mile/h); all dampers are switched simultaneously.
Sudden movement of the vehicle body, in response to road inputs, is detected by the vertical accelerometers, and the ADCM
switches the dampers to the firm setting to give improved damping of the resultant oscillations.
When cornering forces are detected by th e lateral accelerometer, the ADCM switches the dampers to the firm setting to
reduce the roll rate an d improve wheel control.
After the event has passed, the dampers revert to the soft setting.
When the footbrake is applied, the ADCM re ceives a signal and calculates the rate of vehicle deceleration. If the deceleration
rate is greater than a certain threshold, the dampers are switched to the firm setting to reduce the pitch rate and improve
wheel control.
If a system failure occurs, the ADCM grounds the output line to the instrument cluster message center, which displays a
text warning SUSPENSION FAULT and illuminates the amber warning lamp. Under fault conditions the system always fails to
the firm setting, so that the vehicle will be safe to drive un der all road and driving conditions.
Connector Pin Identity Chart for EM068

Pin
Number
Ci
rcui
t
Circuit Functi
on
1System erro
r output to instrument
cluster
2Not
used
3O/
P a
ccelerometer ground
4 to

9
Not
used
10K-
li
ne to diagnostic socket
11Ignition su
pply +12V
12Not
used
13Control signal (+ve) output
to l
eft-hand rear damper
14Control signal (+ve) output
to right-hand front damp
er
15Control signal (+ve) output
to right-hand rear
damper
16
a
nd 17
No
t
used
18Ground
19No
t
used
20Lateral
accelerometer i
nput
21Front vertical ac
celerometer in
put
22Rear vertical
acce
lerometer input
23No
t
used
24R
o
ad speed input from
instrument cluster
25Power output +5V to suppl y accelerometers
26Brake peda
l input

Page 277 of 2490

JAGUAR X308 1998 2.G Workshop Manual

27Battery su
pply +12V
28L-

line to diagnostic socket
29No

t used
30Control signal (+ve) output

to left-hand front damper
31Control signal (-v

e) output to left-hand front damper
32Control s

Page 278 of 2490

JAGUAR X308 1998 2.G Workshop Manual 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 t

Page 279 of 2490

JAGUAR X308 1998 2.G Workshop Manual Dr
iveline System - General Information - Driveline System
Description an
d Operation
Details of the Driveline System can be found in sections 205-01 and 205-02.

Page 280 of 2490

JAGUAR X308 1998 2.G Workshop Manual Driveshaft -
Torques

Comp

onent
Nm
Bol
t
M12 - Jurid flexible coupling to
transmission and final drive flanges
75
-
88
Screw
-
Centre bearing to underbody
19
,5
- 26,5
Screw
-
P

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