Land Rover Defender 90 Workshop 2nd Edition Nas Rover Manual

17EMISSION CONTROL
2
REPAIR VAPOUR SEPARATOR
Service repair no - 17.15.19
Remove
1.Remove 7 screws securing floor carpet rear
retainer.
2.Release lower section of door sealing rubber on
one side.
3.Remove carpet retainer.
4.Fold floor carpet back on RH side.
5.Release RH side carpet and move aside to
reveal 2 screws securing vapour separator.
6.Remove 2 screws securing vapour separator.
7.Release vapour separator pipe from clip on fuel
pipe.
8.Depress 2 lugs on vapour separator connector
and disconnect...

EMISSION CONTROL
3
REPAIR FRONT PIPE / CATALYTIC CONVERTER
Service repair no - 17.50.09
Remove
WARNING: The removal of the exhaust
system must only be carried out when the
engine is cold.
1.Raise vehicle on ramp.
2.Remove oxygen sensors.
See FUEL SYSTEM,
Repair, Heated oxygen sensor (ho2s) - front
andSee FUEL SYSTEM, Repair, Heated
oxygen sensor (ho2s) - rear
3.Remove 4 bolts securing front anti-roll [sway] bar
mounting brackets.
4.Remove 6 nuts securing front pipe assembly to
exhaust manifolds.
5.Remove...

SFI
1
DESCRIPTION AND OPERATION ENGINE MANAGEMENT SYSTEM COMPONENT
LOCATION
1.Engine Control Module (ECM)
2.Ignition coils
3.Fuel pressure regulator
4.Mass air flow (MAF) sensor
5.Relay module
- Main relay
- Fuel pump relay
6.Engine coolant temperature (ECT) sensor
7.Camshaft position (CMP) sensor
8.Throttle position (TP) sensor 

19FUEL SYSTEM
2
DESCRIPTION AND OPERATION
1.EVAP purge valve
2.Inertia switch
3.Engine fuel temperature (EFT) sensor
4.Crankshaft position (CKP) sensor
5.Heated oxygen sensor (HO2S) - 4 off
6.Injectors - 8 off
7.Idle air control valve (IACV)
8.Knock sensors - 2 off
9.Intake air temperature (IAT) sensor 

SFI
3
DESCRIPTION AND OPERATION ENGINE MANAGEMENT SYSTEM
Description
The engine management system (EMS) maintains
optimum engine performance over the entire
operating range. The correct amount of fuel is
metered into each cylinder inlet tract and the ignition
timing is adjusted at each spark plug.
The system is controlled by the Engine Control
Module (ECM) which receives data from sensors
located on and around the engine. From this
information it provides the correct fuel requirements
and ignition timing...

19FUEL SYSTEM
4
DESCRIPTION AND OPERATION Engine coolant temperature (ECT) sensor
This sensor consists of a temperature dependant
resistive metal strip. The resistance of the strip varies
considerably with coolant temperature, i.e.
- 28K ohms at 30°C, 86°F
- 300 ohms at 85°C, 185°F
- 90 ohms at 130°C, 266°F
The ECT Sensor signal is vital to engine running, as
the correct fuelling is dependant upon engine
temperature i.e. richer mixture at low temperatures. If
the sensor is disconnected or failure occurs...

SFI
5
DESCRIPTION AND OPERATION Ignition coils
The electronic ignition system uses four double ended
coils. They are mounted on a bracket fitted to the rear
of the engine. The circuit to each coil is completed by
switching within the ECM, allowing each coil to charge
up and fire. Sparks are produced in two cylinders
simultaneously, one on compression stroke, the other
on exhaust stroke. Note that coil 1 feeds cylinders 1
and 6, coil 2 feeds cylinders 5 and 8, coil 3 feeds
cylinders 4 and 7, and coil 4...

19FUEL SYSTEM
6
DESCRIPTION AND OPERATION Fuel pressure regulator
The fuel pressure regulator is a mechanical device
controlled by manifold depression and is mounted at
the rear of the engine in the fuel rail. The regulator
ensures that fuel rail pressure is maintained at a
constant pressure difference to that in the inlet
manifold, as manifold depression increases the
regulated fuel pressure is reduced in direct proportion.
When pressure exceeds the regulator setting excess
fuel is spill returned to the...

SFI
1
ADJUSTMENT ENGINE TUNING
Service repair no - 19.22.13
The position of the Idle Air Control (IAC) valve can be
checked using TestBook and adjusted if necessary
through the by-pass screw in the plenum chamber.
The bypass screw is covered by a tamper proof plug
which can be extracted using a self tapping screw.
All vehicles:
1.Ensure air conditioning and all electical loads are
off. Vehicle must be in neutral or park.
2.Carry out tuning or base idle setting procedure
as applicable using TestBook.
FUEL...

SFI
1
REPAIR IGNITION COILS - SET
Service repair no - 18.20.45
Remove
1.Disconnect battery negative lead.
2.Noting their fitted positions, disconnect 8 h.t.
leads from ignition coils.
3.Move leads aside.
4.Disconnect coil multiplug and release from
mounting bracket.
5.Remove 4 nuts securing coil mounting bracket to
engine.
6.Remove coils and mounting bracket assembly.
Do not carry out further dismantling if
component is removed for access only.
7.Remove terminal cover and note lead positions.
8.Remove 2...