1998 JAGUAR X308 Workshop Manual

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Page 1145 of 2490

JAGUAR X308 1998 2.G Workshop Manual Intake Air Distribution and Filtering - Throt
tle Body Elbow Gasket
Re
moval and Installation
Remov

al
Installation

1.
R
emove throttle intake elbo
w; refer to (SC)19.70.28.
1. Installat

Page 1146 of 2490

JAGUAR X308 1998 2.G Workshop Manual Intake Air Distribution and Filtering - Throttle B
ody Elbow Gasket4.0L NA
V8 - AJ27/3.2L NA V8 - AJ26
Re mo
val and Installation
Remova

l
Installation

1.
Re
move throttle intake el
bow;

Page 1147 of 2490

JAGUAR X308 1998 2.G Workshop Manual Intake Air Distribution and Filtering - Throt
tle Body Elbow Gasket4.0L SC
V8 - AJ26
Re
moval and Installation
Remov

al
Installation

1.
R
emove throttle intake elbo
w; refer to (SC)19.70

Page 1148 of 2490

JAGUAR X308 1998 2.G Workshop Manual Evaporative E
missions - Evaporative Emissions
Description an
d Operation

To reduce the emission of fuel vapour, th e fuel tank is vented to atmosphere through activated charcoal adsorption canist

Page 1149 of 2490

JAGUAR X308 1998 2.G Workshop Manual The E
VAP canister purge valve controls th
e flow rate of fuel vapour drawn into the engine during the canister purge
operation. The valve is opened by a vacu um feed from the induction elbow : the

The E
VAP canister purge valve controls th
e flow rate of fuel vapour drawn into the engine during the canister purge
operation. The valve is opened by a vacu um feed from the induction elbow : the vacu um feed is controlled by the integral
valve solenoid and is applied when the so lenoid is energised. The solenoid is pulsed on (energised) and off by a fixed
frequency (100Hz) variable pulse width control signal (pulse width modulation). By varying the pulse on to off time, the
ECM controls the duty cycle of the valve (time that the valve is open to time closed) and thus the vapour flow rate to the
engine.
With no ECM signal applied to the va lve solenoid, the valve remains closed.
Can
ister Purge Operation
The
following pre-conditions are ne
cessary for purging to commence :
aft
er battery disconnection/reconnection, engine
management adaptations must be re-instated.
engine has run for
at least 8 seconds.
engi

ne coolant temperature is not less than 70 °C.
engine

not running in the fuel
cut off condition (eg overrun).
t
he adaptive fuel correction
function has not registered a rich or lean failure
t
he evaporative emission leak test has not failed
no faults have been diagnosted in th
e rel
evant sensor and valve circuits -
Air Flow Meter (AFM), Engine Coolant
Temperature sensor, Evaporativ e Canister Purge valve and Canister Close Valve (CCV).
If these conditions have been satisfied, purging is started. If any failures are registered, purging is inhibited.
The canister(s) is purged during each driv e cycle at various rates in accordance with the prevailing engine conditions. The
engine management software st ores a map of engine speed (RPM) against engine load (grams of air inducted / rev). For
any given engine speed and load, a vapour purge rate is assigned (purge rate increases with engine speed and load).
The preset purge rates are base d on the assumption of a vapour concentratio n of 100%. The actual amount of vapour is
measured by the closed loop fueling system : the input of evaporative fuel into the engine causes the outputs from the
upstream oxygen sensors to change, the am ount of change providing a measure of the vapour concentration. This feedback
causes the original purge rate to be adju sted and also reduces the amount of fuel input via the injectors to maintain the
correct air to fuel ratio.
Engine speed/load mapping and the corresp onding purge rates are different for single canister, running loss and ORVR
evaporative systems.

Page 1150 of 2490

JAGUAR X308 1998 2.G Workshop Manual
Thi s
system uses a single charcoal canister with a pressure
control valve between the canister and the fuel tank vapour
outlet. A vacuum control pipe is connecte d from the engine intake induct

Page 1151 of 2490

JAGUAR X308 1998 2.G Workshop Manual
The evaporative l
oss flange assembly is fitted to the top of the tank via a seal and locking ring. The assembly is removeable
complete with the fitted components.
The vapour vent / rollover valv

Page 1152 of 2490

JAGUAR X308 1998 2.G Workshop Manual
The ru nning loss
system has the following features :
a
normall
y open pressure control valve is fi
tted at the lefthand side of the tank.
two charcoal
canisters are connected in seri

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