Land Rover Defender V8i Workshop Supplement Rover Manual

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) - 2 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 for 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...

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...

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 by-pass 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....

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...

19FUEL SYSTEM
2
REPAIR ELECTRONIC CONTROL MODULE (ECM)
Service repair no - 18.30.01
Remove
1.Remove screw securing ECM cover.
2.Remove cover.
3.Disconnect 3 multiplugs from ECM.
4.Remove 2 screws securing ECM.
5.Release ECM from 2 lower retainers.
6.Remove ECM.
Refit
7.Position ECM and secure to lower retainers.
8.Fit and tighten screws securing ECM.
9.Connect multiplugs.
10.Fit cover and secure with screw.INTAKE AIR TEMPERATURE (IAT) SENSOR
Service repair no - 18.30.09
Remove
1.Disconnect multiplug from...

SFI
3
REPAIR ENGINE COOLANT TEMPERATURE (ECT)
SENSOR
Service repair no - 18.30.10
Remove
1.Disconnect battery negative lead.
2.Depress spring clip and disconnect ECT sensor
multiplug.
3.Position cloth around ECT sensor to absorb
coolant spillage.
4.Remove ECT sensor.
5.Remove sealing washer and discard.
Refit
6.Clean sealing washer, sensor threads and
sensor location.
7.Coat sensor threads with Loctite 577 and fit new
sealing washer.
8.Fit ECT sensor and tighten to
20 Nm (15 lbf.ft).
9.Connect multiplug...