Land Rover Defender 1999 2002my Workshop Supplement Body Repair 2nd Edition Rover Manual

17EMISSION CONTROL
10
DESCRIPTION AND OPERATION INLET THROTTLE (ILT) MODULATOR
1.Port to vacuum source (white band)
2.Port to ILT valve (blue band)
3.Port to atmosphere via in-line filter (green band)
4.Harness connector (green)
The ILT modulator is located on a plate fixed to the inner wing on the RH side of the engine below the EGR
modulator. The modulator is attached to the plate by two through-studs, each with two nuts which secure the
modulator assembly to a rubber mounting which helps to reduce...

EMISSION CONTROL
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DESCRIPTION AND OPERATION EGR VALVE
1.EGR valve vacuum port
2.EGR valve assembly
3.Gasket - EGR valve to inlet manifold
4.EGR pipe connection5.Exhaust gas intake
6.Intake air
7.EGR valve open (vacuum applied to EGR valve)
8.EGR valve closed (no vacuum applied to EGR
valve)
The EGR valve is a cast and machined assembly which locates on the front end of the inlet manifold assembly.
The machined faces of the EGR assembly and the inlet manifold are attached attached together using four...

17EMISSION CONTROL
12
DESCRIPTION AND OPERATION INLET THROTTLE (ILT) VALVE
1.EGR valve vacuum port
2.EGR valve assembly
3.Gasket - EGR valve to inlet manifold
4.ILT valve vacuum port
5.ILT valve
6.EGR pipe connection
7.Exhaust gas intake
8.ILT valve - butterfly
9.Intake air
10.EGR valve open (vacuum applied to EGR valve; ILT valve butterfly shown fully open)
11.EGR valve closed (no vacuum to EGR valve; ILT butterfly valve shown fully open)
The ILT valve is used on certain exhaust gas recirculation...

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DESCRIPTION AND OPERATION
IN-LINE
 AIR  FILTER  -  PRE  EU 33 
    MODELS
1. To modulator vent port
2. Filter element 3.
To atmosphere
The in-line air filter is placed in the ventilation line from the EGR modulator. The modulator needs to be able to
vent to atmosphere in order to release the vacuum supplied to the EGR valve. The filter prevents contamination
entering the modulator via the vent port which could cause failure. The filter should be periodically changed in
accordance with...

17EMISSION CONTROL
14
DESCRIPTION AND OPERATION EGR SYSTEMS
There are two types of exhaust gas recirculation system used with the Td5 engine dependent on legislation and
market requirements, these are type 1 and type 2.
Type 1 EGR system is fitted to all Td5’s built up to the introduction of 2002 MY, except for Japanese specification
vehicles.
Type 2 EGR system is fitted to all Japanese specification vehicles and was introduced into European markets for
2002 MY to meet EU3 emission requirements. An...

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15
DESCRIPTION AND OPERATION EGR System - Type 2
This system features twin modulators mounted one above the other on a metal plate located on the inner wing at
the RH side of the engine. The modulators are electrically controlled by the engine management system and are
used to modulate a vacuum source to the EGR valve and a supplementary Inlet Throttle (ILT) valve; the two
valves are controlled to operate in tandem. The ILT valve vacuum pot is mounted adjacent to the EGR valve
housing...

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1
REPAIR VALVE - EGR - NON EU3 MODELS
Service repair no - 17.45.01
Remove
1.Disconnect battery negative lead.
2.Remove 3 bolts and remove engine acoustic
cover.
3.Remove cooling fan.See COOLING SYSTEM,
Repair.
4.Remove battery cover.
5.Disconnect battery negative lead.
6.Disconnect vacuum hose from EGR valve
7.Loosen clip screw and release air intake from
EGR valve.
8.Remove 4 bolts, release EGR valve from inlet
manifold and discard gasket.
9.Remove 2 bolts and release EGR valve clip...

17EMISSION CONTROL
2
REPAIR VALVE - EGR - EU3 MODELS
Service repair no - 17.45.01
Remove
1.Release turnbuckles and remove battery cover.
2.Disconnect battery earth lead.
3.Remove 3 bolts and remove engine acoustic
cover.
4.Remove cooling fan coupling.See COOLING
SYSTEM, Repair.
5.Disconnect vacuum hose(s) from EGR valve.
6.Loosen screw and disconnect air intake hose
from EGR valve.
7.Remove screw and remove clamp securing EGR
pipe to EGR valve.
8.Remove 4 bolts securing EGR valve, remove
valve and...

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3
REPAIR INLET THROTTLE (ILT) MODULATOR
Service repair no - 17.45.03
Remove
1.Identify the fitted positions of the 3 vacuum
pipes, then disconnect from the ILT modulator
valve.
2.Disconnect multiplug from ILT modulator.
3.Remove 2 nuts securing modulator and remove
ILT modulator from its moutings.
Refit
4.Fit ILT modulator to its mountings, fit the nuts
and tighten to10 Nm (7 lbf.ft).
5.Connect vacuum pipes to the positions identified
during removal.
6.Connect multiplug to ILT...