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