1989 FORD FIESTA turn signal

1 General information andprecautions
General information
The fuel system consists of a fuel tank
(mounted under the body, beneath the rear
seats), fuel hoses, an electric fuel pump
mounted in the fuel tank, and a central fuel
injection (CFi) system. Fuel is supplied from the tank by an integral
electric fuel pump (and combined fuel gauge
sender unit). The fuel is passed through an in-
line filter within the engine compartment, then
to the fuel injection unit. The fuel is maintained
at the required operating pressure by a
pressure regulator unit. The CFi unit itself is a relatively simple
device when compared with a conventional
carburettor. Fuel is injected by a single
solenoid valve (fuel injector) which is mounted
centrally on top of the unit. It is this feature
which gives the system CFi (or Central Fuel
injection) its name (see illustration).The injector is energised by an electrical
signal sent from the EEC IV engine
management module. When energised, the
injector pintle is lifted from its seat, and
atomised fuel is delivered into the inlet
manifold under pressure. The electrical
signals take two forms of current - a high
current to open the injector, and a low current
to hold it open for the duration required. At
idle speed, the injector is pulsed at every
other inlet stroke, rather than with every
stroke as during normal operation.
The air-to-fuel mixture ratio is regulated by
the EEC IV module, based on inputs from the
various engine sensors. No adjustments to
the fuel mixture are possible.
The throttle plate control motor (mounted
on the side of the CFi unit) regulates the idle
speed by reacting to the signals sent by the
EEC IV module. The signals are calculated by
the values and information provided from the
engine sensors. When the throttle position
sensor indicates that the throttle is closed, the
module enters the idle speed mode or
dashpot mode (according to engine speed).
The module maintains the idle speed at a constant value, making minor adjustments as
necessary for different loads and conditions.
The base idle speed can only be adjusted by a
dealer or fuel injection specialist with the
necessary equipment to link up to the engine
management module.
To prevent the engine from running on (or
dieseling) when it is switched off, the EEC IV
module sends a signal to the throttle plate
control motor, to fully close the throttle plate
and return it to its preset position ready for
restarting. When the ignition is switched on
to restart the engine, the motor repositions
the throttle plate to the position required
according to the prevailing conditions. The EEC IV module is the heart of the entire
engine management system, controlling the
fuel injection, ignition and emissions control
systems. The module receives information
from various sensors to determine engine
temperature, speed and load, and the
quantity of air entering the engine. The
sensors also inform the module of throttle
position, inlet air temperature and exhaust gas
oxygen content. All the information supplied
to the module is computed and compared
with pre-set values stored in it’s memory, to
determine the required period of injection. Information on crankshaft position and
engine speed is generated by the distributor
on pre-1990 CVH engine models, or by a
crankshaft position sensor on all other
models. The inductive head of the crankshaft
position sensor runs just above the engine
flywheel and scans a series of 36 protrusions
on the flywheel periphery. As the crankshaft
rotates, the sensor transmits a pulse to the
system’s ignition module every time a
protrusion passes it. There is one missing
protrusion in the flywheel periphery at a point
corresponding to 90º BTDC. The ignition
module recognises the absence of a pulse
from the crankshaft position sensor at this
point to establish a reference mark for
crankshaft position. Similarly, the time interval
between absent pulses is used to determine
engine speed. This information is then fed to
the EEC IV module for further processing. Engine temperature information is supplied
by the coolant temperature sensor. This
component is an NTC (Negative Temperature
Coefficient) thermistor - that is, a semi-
conductor whose electrical resistance
decreases as its temperature increases. It
provides the EEC IV module with a constantly-
varying (analogue) voltage signal,
corresponding to the temperature of the
engine coolant. This is used to refine the
calculations made by the module, when
determining the correct amount of fuel
required to achieve the ideal air/fuel mixture
ratio. Inlet air temperature information is supplied
by the inlet air temperature sensor. This
component is also an NTC thermistor - see
the previous paragraph - providing the EEC IV
module with a signal corresponding to the
temperature of air passing into the engine.
4B•2 Fuel system - central fuel injection engines
1.3 Exploded view of the CFi unit
1 Fuel injector assembly
2 Fuel pressure regulator
assembly 3 Fuel feed connector
4 Intake air temperature
sensor 5 Throttle-plate control
motor
6 Throttle position sensor
7 Fuel injector wiring
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This is used to refine the calculations made by
the module, when determining the correct
amount of fuel required to achieve the ideal
air/fuel mixture ratio.A throttle position sensor is mounted on the
end of the throttle valve spindle, to provide
the EEC IV module with a constantly-varying
(analogue) voltage signal corresponding to the
throttle opening. This allows the module to
register the driver’s input when determining
the amount of fuel required by the engine. Road speed is monitored by the vehicle
speed sensor. This component is a Hall-effect
generator, mounted on the transmission’s
speedometer drive. It supplies the EEC IV
module with a series of pulses corresponding
to the vehicle’s road speed, enabling the
module to control features such as the fuel
shut-off on overrun. A manifold absolute pressure sensor
measures inlet manifold vacuum, and supplies
this information to the module for calculation
of engine load at any given throttle position. Where power steering is fitted, a pressure-
operated switch is screwed into the power
steering system’s high-pressure pipe. The
switch sends a signal to the EEC IV module to
reduce engine speed should the power
steering fluid pressure become excessively
high. Certain later engines may be fitted with a
heater in the inlet manifold. This is controlled
by the EEC IV module to ensure that, even
before the effect of the coolant heating
becomes apparent, the manifold is warmed-
up. This prevents fuel droplets condensing in
the manifold, thus improving driveability and
reducing exhaust emissions when the engine
is cold.
The oxygen sensor in the exhaust system
provides the EEC IV module with constant
feedback - “closed-loop” control - which
enables it to adjust the mixture to provide the
best possible conditions for the catalytic
converter to operate.
Precautions
Warning: Petrol is extremely
flammable - great care must be
taken when working on any part
of the fuel system. Do not
smoke or allow any naked flames or
uncovered light bulbs near the work area.
Note that gas powered domestic
appliances with pilot flames, such as
heaters, boilers and tumble dryers, also
present a fire hazard - bear this in mind if
you are working in an area where such
appliances are present. Always keep a
suitable fire extinguisher close to the work
area and familiarise yourself with its
operation before starting work. Wear eye
protection when working on fuel systems
and wash off any fuel spilt on bare skin
immediately with soap and water. Note
that fuel vapour is just as dangerous as
liquid fuel; a vessel that has just been
emptied of liquid fuel will still contain vapour and can be potentially explosive.
Petrol is a highly dangerous and volatile
liquid, and the precautions necessary
when handling it cannot be overstressed.
Many of the operations described in this
Chapter involve the disconnection of fuel
lines, which may cause an amount of fuel
spillage. Before commencing work, refer
to the above Warning and the information
in “Safety first” at the beginning of this
manual. When working with fuel system
components, pay particular attention to
cleanliness - dirt entering the fuel system
may cause blockages which will lead to
poor running.
Note: Residual pressure will remain in the fuel
lines long after the vehicle was last used,
when disconnecting any fuel line, it will be
necessary to depressurise the fuel system as
described in Section 2 .
2 Fuel system-
depressurisation
1
Note: Refer to the warning note in Section 1
before proceeding.
Warning: The following
procedure will merely relieve the
pressure in the fuel system -
remember that fuel will still be present in
the system components, and take
precautions accordingly before
disconnecting any of them.
1 The fuel system referred to in this Chapter
is defined as the fuel tank and tank-mounted
fuel pump/fuel gauge sender unit, the fuel
filter, the fuel injector, fuel pressure regulator,
and the metal pipes and flexible hoses of the
fuel lines between these components. All
these contain fuel, which will be under
pressure while the engine is running and/or
while the ignition is switched on.
2 The pressure will remain for some time after
the ignition has been switched off, and must
be relieved before any of these components is
disturbed for servicing work.
3 The simplest depressurisation method is to
disconnect the fuel pump electrical supply by
removing the fuel pump fuse (No 19) and
starting the engine; allow the engine to idle
until it dies through lack of fuel pressure. Turn
the engine over once or twice on the starter to
ensure that all pressure is released, then
switch off the ignition; do not forget to refit the
fuse when work is complete.
4 Note that, once the fuel system has been
depressurised and drained (even partially), it
will take significantly longer to restart the
engine - perhaps several seconds of cranking
- before the system is refilled and pressure
restored.
3 Fuel lines and fittings -
general information
Note: Refer to the warning note in Section 1
before proceeding.
Disconnecting and connecting
quick-release couplings
1 Quick-release couplings are employed at
many of the unions in the fuel feed and return
lines.
2 Before disconnecting any fuel system
component, relieve the residual pressure in
the system (see Section 2), and equalise tank
pressure by removing the fuel filler cap.
Warning: This procedure will
merely relieve the increased
pressure necessary for the
engine to run - remember that
fuel will still be present in the system
components, and take precautions
accordingly before disconnecting any of
them.
3 Release the protruding locking lugs on each
union, by squeezing them together and
carefully pulling the coupling apart. Use rag to
soak up any spilt fuel. Where the unions are
colour-coded, the pipes cannot be confused.
Where both unions are the same colour, note
carefully which pipe is connected to which,
and ensure that they are correctly
reconnected on refitting.
4 To reconnect one of these couplings, press
them together until the locking lugs snap into
their groove. Switch the ignition on and off
five times to pressurise the system, and check
for any sign of fuel leakage around the
disturbed coupling before attempting to start
the engine.
Checking
5 Checking procedures for the fuel lines are
included in Chapter 1.
Component renewal
6 If any damaged sections are to be renewed,
use original-equipment replacement hoses or
pipes, constructed from exactly the same
material as the section being replaced. Do not
install substitutes constructed from inferior or
inappropriate material; this could cause a fuel
leak or a fire.
7 Before detaching or disconnecting any part
of the fuel system, note the routing of all
hoses and pipes, and the orientation of all
clamps and clips. Replacement sections must
be installed in exactly the same manner.
8 Before disconnecting any part of the fuel
system, be sure to relieve the fuel system
pressure (see Section 2), and equalise tank
pressure by removing the fuel filler cap. Also
disconnect the battery negative (earth) lead -
see Chapter 5A, Section 1. Cover the fitting
being disconnected with a rag, to absorb any
fuel that may spray out.
Fuel system - central fuel injection engines 4B•3
4B
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Torque wrench settingsNmlbf ft
Idle speed control valve bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 to 5 3 to 4
Fuel pressure regulator bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 to 12 6 to 9
Fuel rail bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . 20 to 26 15 to 19
Inlet air temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 to 25 15 to 18
Inlet manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . 16 to 20 12 to 15
Oxygen sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . 50 to 70 37 to 52
Intercooler-to-radiator bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 to 6 3 to 5
Boost control valve screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 to 2.7 1.5 to 2
Exhaust manifold heatshield bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 to 26 16 to 19
Exhaust manifold-to-engine nuts (non-Turbo models) . . . . . . . . . . . . . . 14 to 17 11 to 13
Exhaust manifold-to-engine nuts (Turbo models) . . . . . . . . . . . . . . . . . 28 to 31 21 to 23
Exhaust manifold-to-turbocharger bolts . . . . . . . . . . . . . . . . . . . . . . . . 20 to 28 15 to 21
Turbocharger-to-exhaust downpipe nuts . . . . . . . . . . . . . . . . . . . . . . . . 35 to 47 26 to 35
Turbocharger cooling pipe banjo union bolts . . . . . . . . . . . . . . . . . . . . . 22 to 29 17 to 22
Turbocharger oil feed and return line couplings . . . . . . . . . . . . . . . . . . . 15 to 20 11 to 15
4C•2 Fuel system - electronic fuel injection engines
1595Ford Fiesta Remake
1 General information and
precautions
General information
The fuel system consists of a fuel tank
(mounted under the body, beneath the rear
seats), fuel hoses, an electric fuel pump
mounted in the fuel tank, and an electronic
fuel injection system. Fuel is supplied under pressure from the
fuel pump to the fuel distributor rail mounted
on top of the inlet manifold (see illustration).
The fuel rail acts as a pressurised fuel
reservoir for the fuel injectors. The electro-
mechanical injectors have only “on” or “off”
positions, the volume of fuel being injected to meet the engine operating conditions being
determined by the length of time that the
injectors are opened. The volume of fuel
required for one power stroke is determined
by the EEC IV engine management module,
and is divided by two equal amounts. The first
half of the required volume is injected into the
static air ahead of the inlet valve one complete
engine revolution before the inlet valve is due
to open. After one further revolution, the inlet
valve opens and the required fuel volume is
injected into the air flow being drawn into the
cylinder. The fuel will therefore be consistently
injected to two inlet valves simultaneously at a
particular crankshaft position.
The volume of air drawn into the engine is
governed by the air filter unit and other
variable operating factors. These variables are
assessed by the EEC IV module and the corresponding signals are produced to
actuate the injectors accordingly.
The engine base idle speed can be
adjusted (if required), by turning the adjuster
screw (covered by a tamperproof cap) in the
throttle housing. Provision for adjusting the
fuel mixture is made by the mixture screw in
the potentiometer unit mounted on the
bulkhead. An idle speed control valve, itself controlled
by the EEC-IV engine management module,
stabilises the engine idle speed under all
conditions by the opening of an auxiliary air
passage which bypasses the throttle. Apart
from a base-idle speed adjustment, no
adjustments to the operational idle speed can
be made. The EEC IV module is the heart of the entire
engine management system, controlling the
fuel injection, ignition and emissions control
systems. The module receives information
from various sensors to determine engine
temperature, speed and load, and the
quantity of air entering the engine. The
sensors also inform the module of throttle
position, inlet air temperature and, on models
with catalytic converters, exhaust gas oxygen
content. All the information supplied to the
module is computed and compared with
pre-set values stored in it’s memory, to
determine the required period of injection.
Information on crankshaft position and
engine speed is generated by a crankshaft
position sensor. The inductive head of the
sensor runs just above the engine flywheel
and scans a series of 36 protrusions on the
flywheel periphery. As the crankshaft
rotates, the sensor transmits a pulse to the
system’s ignition module every time a
protrusion passes it. There is one missing
protrusion in the flywheel periphery at a point
corresponding to 90° BTDC. The ignition
module recognises the absence of a pulse
from the crankshaft position sensor at this
point to establish a reference mark for
crankshaft position. Similarly, the time interval
between absent pulses is used to determine
engine speed. This information is then fed to
the EEC IV module for further processing.
1.2 General view of the 1.6 litre EFi fuel injection system arrangement\
1 Throttle housing
2 Upper inlet manifold section
3 Wiring loom connector
4 Intake air temperature sensor 5 Wiring harness ducting
6 Fuel rail
7 Lower section of inlet
manifold
8 Cylinder head 9 Fuel injector
10
Fuel pressure regulator
11 Vacuum hose
12 Air inlet duct
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flux can pass between the magnet and the
sensor. When a trigger vane segment is in line
with the sensor, the magnetic flux is diverted
through the trigger vane, away from the
sensor. The sensor detects the change in
magnetic flux and sends an impulse to the
EEC IV module. Additional data is received
from the engine coolant temperature sensor,
manifold absolute pressure sensor, inlet air
temperature sensor, throttle position sensor
and vehicle speed sensor. Using this
information the EEC IV module calculates the
optimum ignition advance setting and
switches off the low tension circuit via the
ignition module. This results in the collapse of
the magnetic field in the coil which generates
the high tension voltage. The high tension
voltage is then fed, via the coil HT lead and
the carbon brush in the centre of the
distributor cap, to the rotor arm. The voltage
passes across to the appropriate metal
segment in the cap and via the spark plug HT
lead to the spark plug where it finally jumps
the spark plug gap to earth. It can be seen
that the ignition module functions basically as
a high current switch by controlling the low
tension supply to the ignition coil primary
windings.In the event of failure of a sensor, the
EEC IV module will substitute a preset value
for that input to allow the system to continue
to function. In the event of failure of the
EEC IV module, a “limited operation strategy”
(LOS) function allows the vehicle to be driven,
albeit at reduced power and efficiency. The
EEC IV module also has a “keep alive
memory” (KAM) function which stores idle and
drive values and codes which can be used to
indicate any system fault which may occur.
Distributorless ignition systems
The main ignition system components
include the ignition switch, the battery, the
crankshaft speed/position sensor, the ignition
module, the coil, the primary (low tension/LT)
and secondary (high tension/HT) wiring
circuits, and the spark plugs. The system used on carburettor models is
termed DIS (Distributorless Ignition System),
and on fuel injection models E-DIS, (Electronic
Distributorless Ignition System). The primary
difference between the two is that the DIS
system is an independent ignition control
system while the E-DIS system operates in
conjunction with the EEC IV engine
management module which also controls the
fuel injection and emission control systems.
With both systems, the main functions of
the distributor are replaced by a computerised
ignition module and a coil unit. The coil unit
combines a double-ended pair of coils - each
time a coil receives an ignition signal, two
sparks are produced, at each end of the
secondary windings. One spark goes to a
cylinder on compression stroke and the other
goes to the corresponding cylinder on its
exhaust stroke. The first will give the correct power stroke, but the second spark will have
no effect (a “wasted spark”), occurring as it
does during exhaust conditions.
The ignition signal is generated by a
crankshaft position sensor which scans a
series of 36 protrusions on the periphery of
the engine flywheel. The inductive head of the
crankshaft position sensor runs just above the
flywheel periphery and as the crankshaft
rotates, the sensor transmits a pulse to the
ignition module every time a protrusion
passes it. There is one missing protrusion in
the flywheel periphery at a point
corresponding to 90° BTDC. The ignition
module recognises the absence of a pulse
from the crankshaft position sensor at this
point to establish a reference mark for
crankshaft position. Similarly, the time interval
between absent pulses is used to determine
engine speed. On carburettor engines, the ignition module
receives signals provided by information
sensors which monitor various engine
functions (such as crankshaft position,
coolant temperature, inlet air temperature,
inlet manifold vacuum etc). This information
allows the ignition module to generate the
optimum ignition timing setting under all
operating conditions.
On fuel injection engines, the ignition
module operates in conjunction with the
EEC IV engine management module, and
together with the various additional
information sensors and emission control
components, provides total control of the fuel
and ignition systems to form a complete
engine management package. The information contained in this Chapter
concentrates on the ignition-related
components of the engine management
system. Information covering the fuel, exhaust
and emission control components can be
found in the applicable Parts of Chapter 4.
Precautions
When working on the ignition system, take
the following precautions:
a) Do not keep the ignition switch on for
more than 10 seconds if the engine will
not start.
b) If a separate tachometer is ever required
for servicing work, consult a dealer
service department before buying a
tachometer for use with this vehicle -
some tachometers may be incompatible
with these types of ignition systems - and
always connect it in accordance with the
equipment manufacturer’s instructions.
c) Never connect the ignition coil terminals to earth. This could result in damage to
the coil and/or the ignition module.
d) Do not disconnect the battery when the
engine is running.
e) Make sure that the ignition module is
properly earthed.
f) Refer to the warning at the beginning of the next Section concerning HT voltage.
2 Ignition system - testing
2
Warning: Voltages produced by
an electronic ignition system are
considerably higher than those
produced by conventional
ignition systems. Extreme care must be
taken when working on the system with
the ignition switched on. Persons with
surgically-implanted cardiac pacemaker
devices should keep well clear of the
ignition circuits, components and test
equipment.
Note: Refer to the precautions given in
Section 1 of Part A of this Chapter before
starting work. Always switch off the ignition
before disconnecting or connecting any
component and when using a multi-meter to
check resistances.
1 If the engine turns over but won’t start,
disconnect the (HT) lead from any spark plug,
and attach it to a calibrated tester (available at
most automotive accessory shops). Connect
the clip on the tester to a good earth - a bolt
or metal bracket on the engine. If you’re
unable to obtain a calibrated ignition tester,
have the check carried out by a Ford dealer
service department or similar. Any other form
of testing (such as jumping a spark from the
end of an HT lead to earth) is not
recommended, because of the risk of
personal injury, or of damage to the ignition
module.
2 Crank the engine, and watch the end of the
tester to see if bright blue, well-defined sparks
occur.
3 If sparks occur, sufficient voltage is
reaching the plug to fire it. Repeat the
check at the remaining plugs, to ensure
that all leads are sound and that the
coil is serviceable. However, the plugs
themselves may be fouled or faulty, so
remove and check them as described in
Chapter 1.
4 If no sparks or intermittent sparks occur,
the spark plug lead(s) may be defective. Also,
on distributor systems, there may be
problems with the rotor arm or distributor cap
- check all these components as described in
Chapter 1.
5 If there’s still no spark, check the coil’s
electrical connector (where applicable), to
make sure it’s clean and tight. Check for full
battery voltage to the coil at the connector’s
centre terminal. Check the coil itself (see
Section 3). Make any necessary repairs, then
repeat the check again.
6 The remainder of the system checks should
be left to a dealer service department
or other qualified repair facility, as there is a
chance that the ignition module may
be damaged if tests are not performed
properly.
Ignition system 5B•3
5B
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27 Anti-theft systems-
general information
Anti-theft alarm system
1 This system provides an added form of
vehicle security. When the system is
activated, the alarm will sound if the vehicle is
broken into through any one of the doors, the
bonnet, or tailgate. The alarm will also be
triggered if the ignition system is turned on or
the radio/cassette disconnected whilst the
system is activated.
2 This system is activated/de-activated
whenever one of the front doors is
locked/unlocked by the key. The system
operates on all doors, the bonnet and tailgate
whenever each door is individually locked (or,
in the case of central locking, when the central
locking is engaged). In addition, the
ignition/starting system is also immobilised
when the system is activated.
3 A further security feature included is that
even though the battery may be disconnected
whilst the system is activated, the alarm
activation continues as soon as the battery is
reconnected. Because of this feature, it is
important to ensure that the system is de-
activated before disconnecting the battery at
any time, such as when working on the
vehicle.
4 The system incorporates a diagnostic mode
to enable Ford technicians to quickly identify
any faults in the system. In the event of a
system malfunction, any testing or
component removal and refitting should be
entrusted to a Ford dealer.
Passive Anti-Theft System
(PATS)
5 From 1994 model year onwards, a Passive
Anti-Theft System (PATS) is fitted. This
system, (which works independently of the
standard alarm system) is a vehicle
immobiliser which prevents the engine from
being started unless a specific code,
programmed into the ignition key, is
recognised by the PATS transceiver.
6 The PATS transceiver, fitted around the
ignition switch, decodes a signal from the
ignition key as the key is turned from position
“O” to position “II”. If the coded signal
matches that stored in the memory of the
PATS module, the engine will start. If the
signal is not recognised, the engine will crank
on the starter but will not fire.
28 Air bag (driver’s side) -
removal and refitting
4
Warning: Handle the air bag
with extreme care as a
precaution against personal
injury, and always hold it with the cover facing away from your body. If in
doubt concerning any proposed work
involving the air bag or its control circuitry,
consult a Ford dealer or other qualified
specialist.
Removal
1
Disconnect the battery negative (earth) lead
(refer to Chapter 5A, Section 1). Warning: Before proceeding,
wait a minimum of 15 minutes,
as a precaution against
accidental firing of the air bag.
This period ensures that any stored energy
in the back-up capacitor is dissipated.
2 Undo the screws, and remove the steering
column lower shroud.
3 Undo the two external screws and the two
internal screws and remove the steering
column upper shroud.
4 Turn the steering wheel as necessary so
that one of the air bag module retaining bolts
becomes accessible from the rear of the
steering wheel. Undo the bolt, then turn the
steering wheel again until the second bolt is
accessible. Undo this bolt also.
5 Withdraw the air bag module from the
steering wheel far enough to access the
wiring multi-plug. Some force may be needed
to free the module from the additional steering
wheel spoke retainers.
6 Disconnect the multi-plug from the rear of
the module, and remove the module from the
vehicle. Warning: Position the air bag
module in a safe place, with the
mechanism facing downwards
as a precaution against
accidental operation.
Warning: Do not attempt to
open or repair the air bag unit,
or apply any electrical current to
it. Do not use any air bag which
is visibly damaged or which has been
tampered with.
Refitting
7 Refitting is a reversal of the removal
procedure.
29 Air bag (passenger’s side) -
removal and refitting
4
Warning: Handle the air bag
with extreme care as a
precaution against personal
injury, and always hold it with
the cover facing away from your body. If in
doubt concerning any proposed work
involving the air bag or its control circuitry,
consult a Ford dealer or other qualified
specialist.
Removal
1 Disconnect the battery negative (earth) lead
(refer to Chapter 5A, Section 1). Warning: Before proceeding,
wait a minimum of 15 minutes,
as a precaution against
accidental firing of the air bag.
This period ensures that any stored energy
in the back-up capacitor is dissipated.
2 Remove the facia as described in Chap-
ter 11.
3 Undo the air bag module retaining nuts and
remove the unit from the facia. Warning: Position the air bag
module in a safe place, with the
mechanism facing downwards
as a precaution against
accidental operation.
Warning: Do not attempt to
open or repair the air bag unit,
or apply any electrical current to
it. Do not use any air bag which
is visibly damaged or which has been
tampered with.
Refitting
4 Refitting is a reversal of the removal
procedure.
30 Air bag control module -
removal and refitting
4
Removal
1 Disconnect the battery negative (earth) lead
(refer to Chapter 5A, Section 1). Warning: Before proceeding,
wait a minimum of 15 minutes,
as a precaution against
accidental firing of the air bag
unit. This period ensures that any stored
energy in the back-up capacitor is
dissipated.
2 Remove the module access cover from the
rear of the glovebox.
3 Press the module wiring multi-plug locking
tag upwards then pivot the retaining strap
over and disconnect the multi-plug.
4 Remove the facia as described in Chap-
ter 11.
5 Undo the three retaining bolts and remove
the module from its location.
Refitting
6 Refitting is a reversal of the removal
procedure.
31 Air bag clock spring -
removal and refitting
4
Removal
1 Remove the steering wheel as described in
Chapter 10.
2 Undo the three retaining screws, and
remove the clock spring from the steering
wheel. As the unit is withdrawn, note which
aperture in the steering wheel the air bag
Body electrical systems 12•17
12
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