Defender (1993+). Instruction - page 31

FUEL SYSTEM

MULTI

PORT FUEL INJECTION (MFI) CIRCUIT DIAGRAM ST3358M

EF1 Idle air control valve (IACV)

EF15 Tune resistor connector

EF2
EF3 Engine coolant temperature sensor (ECTS)

EF17 Fuel injectors

EF4 Engine fuel temperature sensor (EFTS)

EF18 Fan control timer

EF5 Throttle position sensor (TPS)

EF19 Resistor (manual transmission)

EF6 Main relay module

EF20 Onboard diagnostic module

(OBDM)

EF7 Canister purge valve (CANPV)

EM1 Service reminder indicator unit

EF8 Fuel pump relay module

EM2 Vehicle speed sensor (VSS)

EF9 Inertia fuel shut-off switch (IFS)

EM3 Service reminder light

(SRI)

EF10 Fuel pump (FP)

IB1

Instrument binnacle

EF12 Malfunction indicator lamp (MIL)

IG5

Ignition coil

EF13 Heated oxygen sensor (H02S)

ST2 Terminal post starter solenoid

EF14 Heated oxygen sensor (H02S)

ST5 Starter/ignition switch

Mass air flow sensor (MAFS)

EF16 Data link connector (DLC)

AC24 Air conditioning connections

F20 20 amp fuse, dash fuse box
F3

15 amp fuse, dash fuse box

REISSUED: FEB 1993

5

FUEL SYSTEM

BASE IDLE SPEED SETTlNG

NOTE: Base idle speed is set at factory.

It

should

not require further adjustment unless plenum

Adjusting base idle speed

chamber is changed. The adjustment screw is
sealed with a plug to prevent unauthorised

6.

Drill tamper proof plug and insert a self

alteration.

Check

ignition

timing

before

tapping screw to enable plug

to

be extracted.

attempting following procedure, since this will
affect idle speed.

Equipment required

Two blanking hoses. these are manufactured using
a new idle air control valve hose

-

Part

No.

ETC7874. Cut

two equal pieces 90mm long

from

hose and seal one end of each, using 13mm

diameter bar. Use a suitable clamp to ensure an air
tight seal.

Checking procedure

5.

Start engine and check idle

speed is

within

limits.

1.

Drive vehicle at least

two

miles until engine

and transmission are hot. Switch

off engine.

2.

Check all electrical

loads are OFF, including

air conditioning.

3.

Remove idle air control valve hose.

4.

Fit blanking hoses to both plenum chamber

and idle air control valve. Ensure hoses are
securely fitted to prevent air leaks. Note

throttle cable has

been omitted from

illustration.

7.

Start engine, adjust idle screw clockwise to
decrease or anti-clockwise to increase idle
speed.

8.

Stop

engine,

remove

blanking

hoses.

Reconnect hose to plenum.

9. Fit new tamper proof plug.

6

REISSUED: FEB

1993

FUEL SYSTEM

FUEL

PRESSURE CHECK

1.

Remove fuel pump relay module,

see Fuel

injection relays.

In order

to

check the fuel pressure it is necessary to

2. Start and run engine.

first depressurise the fuel system as follows:

3. When sufficient fuel has been used to cause

fuel line pressure

to

drop, injectors

will

WARNING: Under normal operating conditions

become inoperative, resulting in engine stall.

the fuel injection system is pressurised by a high
pressure

fuel pump, operating at up to

2.3

to 2.5

bar. When engine i s stationary pressure is
maintained

within

system.

To

prevent

NOTE: Fuel

at low pressure

will remain

in

pressurised

fuel escaping and to avoid personal

system.

To

remove low pressure fuel, place

injury it is necessary to depressurise fuel

absorbent cloth around fuel pipe at the filter

injection system before any service operations

are carried out.

5.

Connect the

pressure gauge on the outlet

If

vehicle has not been run there will be

a

small

from

the filter, located

on the chassis.

amount of residual pressure

in

fuel line. The

6.

Reconnect the battery and turn the ignition to

depressurising procedure must still be carried

posititon

II while

observing the pressure gauge.

out before disconnecting any component within

the fuel system.

Expected reading 2,39

-

2,672 kgf/cm²

Pressure drop-max

0.7

kgf/cm² in one minute.

The spilling of fuel i s unavoidable during this

If

pressure is

low

check that filter is

not

operation. Ensure that all necessary precautions

blocked and pump is operating satisfactorily.

are taken to prevent fire and explosion.

Then recheck pressure.

If

pressure is

still

low

renew

regutator,

see

Fuel

pressure

regulator.

Switch

off ignition.

4. Disconnect

battery

ground terminal.

during disconnection

NOTE: Before removing any of the injectors,
remove and examine the spark plugs, check for
consistent colouration of plugs.

A leaking

injector will result in the appropriate spark plug
being 'sooted

up'.

The following

test

may only be carried out using

suitable injector test equipment.

Leak Test

Leak test with the injectors

closed but pressurise

to

2.54 Kgf/cm².

No

injector should leak more than

2

drops of fuel per minute.

A

Pressure gauge 18G1500

B

Fuel tank and pump

Fuel Delivery Test

C

Fuel

filter

D

Fuel injectors

x

8

Fuel delivery test with the injector open and

E

Regulator

pressurised

as

above,

fuel delivery from each

injector should

be 160-175cc per minute using white

spirit, or 180-195cc per minute using petrol at

20°C

±

2°C.

REISSUED: FEB 1993

7

Results

FUEL SYSTEM

REMOVING AIR CLEANER

To Remove

To Remove

REMOVING MASS AIR FLOW SENSOR

1.

Release

two

clips securing air cleaner

to

NOTE: The air flow sensor is not a serviceable

item. In event of failure or damage complete unit

2. Release two nuts and bolts securing air

must be replaced.

3. Detach mass airflow sensor from air cleaner,

1.

Disconnect battery ground terminal

.

4.

Detach air cleaner from centre mounting

sensor.

mass airflow sensor.

cleaner

to

left hand valance mounting bracket.

and lay carefully

to

one side.

bracket

and

withdraw

from

engine

3.

Disconnect multi-plug.

compartment.

4.

Release

two clips securing air cleaner case

to

5.

Remove large ' O ' ring from outlet tube of air

air flow sensor. Remove sensor from engine

cleaner. Fit a new ' O ' ring if in poor condition.

compartment.

6.

Unclip three catches

and

remove inlet tube.

7.

Remove nut and end plate securing air
cleaner element in position.

8.

Withdraw air cleaner element and discard.

9.

Inspect dump valve for condition and free of

obstructions.

2.

Release intake hose clamp, disconnect

from

To Refit

5.

Reverse removal procedure. Ensure multi-plug

is

firmly reconnected, and hose clamp at the

rear

of

sensor is securely tightened, to

prevent unmetered air entering engine.

To Refit

10.

Fit new element and secure

in position.

11.

Refit inlet tube.

12.

Refit air cleaner to mounting bracket and
secure.

13.

Clip air cleaner

to

mass air flow sensor.

8

REISSUED:

FEB

1993

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