ignition FORD MONDEO 1993 Service Service Manual

2Turn the steering wheel so that the front
wheels are in the straight-ahead position.
3Unscrew the screws, and remove the
steering column upper and lower shrouds.
4From the rear of the steering wheel,
unscrew the air bag module mounting screws.
5Carefully lift the module from the steering
wheel, and disconnect the air bag multi-plug
and horn wiring connections.
Warning: Position the air bag
module in a safe place, with the
mechanism facing downwards as
a precaution against accidental
operation.
6Make sure that the steering lock is not
engaged. Unscrew the retaining bolt from the
centre of the steering wheel (see illustration).
7Remove the steering wheel from the top ofthe column, while feeding the horn and air bag
wiring through the hole in the steering wheel
hub (see illustration).
Refitting
8Make sure that the front wheels are still
facing straight-ahead, then locate the steering
wheel on the top of the steering column.
9Refit the retaining bolt, and tighten it to the
specified torque while holding the steering
wheel (see illustration). Do not tighten the
bolt with the steering lock engaged, as this
may damage the lock.
10Reconnect the horn wiring connections
and air bag multi-plug.
11Locate the air bag module/horn contact
on the steering wheel, then insert the
mounting screws and tighten them.12Refit the steering column upper and lower
shrouds. Insert and tighten the screws.
13Reconnect the battery negative lead.
Warning: All models are equipped
with an air bag system. Make
sure that the safety
recommendations given in
Chapter 12 are followed, to prevent
personal injury.
Removal
1Disconnect the battery negative (earth) lead
(refer to Chapter 5, 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.
2Turn the steering wheel so that the front
wheels are in the straight-ahead position.
3Remove the ignition key, then turn the
steering wheel slightly as necessary until the
steering lock engages.
4Unscrew the screws, and remove the
steering column lower and upper shrouds. As
the lower shroud is being removed, it will be
necessary to remove the rubber ring from the
ignition switch/steering lock (see
illustrations).
28 Steering column - removal,
inspection and refitting
10•18 Suspension and steering systems
27.6 Removing the steering wheel
retaining bolt27.7 Feeding the horn and air bag wiring
through the hole in the steering wheel hub27.9 Tightening the steering wheel
retaining bolt
28.4C . . . and remove the lower shroud28.4D Upper shroud retaining screws
(arrowed)
28.4A Unscrew the screws from the lower
shroud . . .28.4B . . . remove the rubber ring . . .
28.4E Removing the upper shroud
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5Remove the driver’s side lower facia panel
(see Chapter 11).
6Unscrew the clamp plate bolt securing the
steering column shaft to the flexible coupling.
Swivel the clamp plate around, and disengage
it from the flexible coupling stub (see
illustrations).
7Release the cable tie from the wiring loom
at the steering column, and disconnect the
multi-plugs (see illustrations).
8Unscrew and remove the steering column
mounting bolts, then slide the column
upwards to disengage the retaining tab from
the groove in the cross-beam bracket, and
withdraw it from inside the vehicle (see
illustrations).
Inspection
9With the steering column removed, check
the universal joints for wear, and examine thecolumn upper and lower shafts for any signs
of damage or distortion (see illustration).
Where evident, the column should be
renewed complete.
10Examine the height adjustment lever
mechanism for wear and damage (see
illustration).
11With the steering lock disengaged, turn
the inner column, and check the upper and
lower bearings for smooth operation. The
bearings are obtainable separately, and
should be renewed if necessary. Dismantling
and reassembly of the column assembly is a
relatively easy operation.
Refitting
12Locate the steering column on its bracket,
making sure that the tab slides down into the
groove correctly.13Insert the mounting bolts and tighten to
the specified torque (see illustration).
14Reconnect the multi-plugs, and secure
the wiring loom with the cable tie.
Suspension and steering systems 10•19
10
28.9 Steering column and universal joint28.10 Height adjustment lever mechanism28.13 Tightening the steering column
mounting bolts
28.7C . . . and main multi-plug from the
steering column28.8A Steering column mounting bolt
locations (arrowed)28.8B Removing the steering column
28.6A Unscrew the clamp plate bolt . . .28.6B . . . and swivel the clamp plate
around28.7A Disconnecting the multi-plug from
the ignition switch
28.7B Disconnecting the small
multi-plug . . .
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15Locate the steering column shaft on the
flexible coupling, swivel the clamp plate
round, then insert the bolt and tighten to the
specified torque.
16Refit the driver’s side lower trim panel.
17Refit the steering column upper and lower
shrouds.
18Reconnect the battery negative lead.
Removal
1Disconnect the battery negative (earth) lead
(refer to Chapter 5, Section 1).
2Turn the steering wheel so that the front
wheels are in the straight-ahead position.
Remove the ignition key, then turn the
steering wheel slightly as necessary until the
steering lock engages.
3Unscrew the clamp plate bolt securing the
steering column shaft to the flexible coupling.
Swivel the clamp plate around, and disengage
it from the flexible coupling stub.
4Carefully prise the rubber boot from the
bulkhead, and withdraw it into the passenger
compartment. Take care not to damage the
sealing lip of the boot.
5Using an Allen key, unscrew the clamp bolt
securing the flexible coupling to the pinion
shaft on the steering gear, and withdraw the
coupling from inside the vehicle.
Refitting
6Refitting is a reversal of the removal
procedure, but tighten the clamp bolts to the
specified torque. Make sure that the rubber
boot engages correctly in the bulkhead and
on the flexible coupling.
Removal
1Remove the steering column flexible
coupling as described in Section 29.
2Apply the handbrake, then jack up the frontof the vehicle and support it on axle stands.
Remove both front wheels.
3Working beneath the vehicle, unbolt the
rear engine mounting from the transmission
and underbody.
4Extract the split pins from the track rod end
balljoint nuts, then unscrew the nuts, and
detach the rods from the arms on the steering
knuckles using a conventional balljoint
removal tool. Take care not to damage the
balljoint seals.
5Position a suitable container beneath the
steering gear, then unscrew the union nuts
securing the power steering fluid supply,
return, and cooler lines to the steering gear.
Identify the lines for position, then unbolt the
clamps, disconnect the lines, and allow the
fluid to drain into the container. Cover the
apertures in the steering gear and also the
ends of the fluid pipes, to prevent the ingress
of dust and dirt into the hydraulic circuit.
6Unscrew and remove the steering gear
mounting bolts. The bolts are located on top
of the steering gear, and are difficult to reach.
Ideally, the special U-shaped Ford spanner
should be used, but it is just possible to reach
them with a normal spanner (see illustration).
7Withdraw the steering gear through the
wheel arch.
Refitting
8If the steering gear is being replaced with a
new one, the new unit will be supplied
together with union nuts already fitted. The
new nuts must only be used with new feed
and return lines - otherwise, they must be
removed and discarded. If the original lines
and union nuts are being used, the Teflon
rings on the union nuts must be renewed. To
do this, the rings must be expanded
individually onto a fitting adaptor (see
illustration), then located in the grooves of
the union nuts.
9Locate the steering gear on the subframe,
and insert the two mounting bolts. Tighten the
bolts to the specified torque (see illustration).
Note that, if the special Ford tool is being
used, the bottom of the tool must be turned
anti-clockwise in order to tighten the
mounting bolts.10Remove the covers from the apertures on
the steering gear, then reconnect the fluid
lines and tighten the union nuts to the
specified torque. Refit the clamps and tighten
the bolts.
11Refit the track rod end balljoints to the
steering knuckles, and tighten the nuts to the
specified torque. Check that the split pin
holes are aligned; if necessary, turn the nuts
to the nearest alignment, making sure that the
torque wrench setting is still within the
specified range. Insert new split pins, and
bend them back to secure.
12Refit the rear engine mounting to the
transmission and underbody, and tighten the
bolts to the specified torque.
13Refit the front wheels, and lower the
vehicle to the ground.
14Refit the steering column flexible coupling
with reference to Section 29.
15Bleed the power steering hydraulic
system as described in Section 33.
16Have the front wheel alignment checked,
and if necessary adjusted, at the earliest
opportunity (refer to Section 36).Removal
1Disconnect the battery negative (earth) lead
(refer to Chapter 5, Section 1).
2Working inside the vehicle, unscrew the
clamp plate bolt securing the steering column
shaft to the flexible coupling. Swivel the clamp
plate around, and disengage it from the
flexible coupling stub.
3Apply the handbrake, then jack up the front
of the vehicle and support it on axle stands.
Remove both wheels.
4On manual transmission models,
disconnect the gearchange linkage and
support rods from the transmission, as
described in Chapter 7, Part A.
5Remove the exhaust downpipe complete,
as described in Chapter 4.
6Remove the cover from under the radiator
by unscrewing the screws and releasing the
clips.
31 Power steering gear
(left-hand-drive models with
ABS) - removal and refitting
30 Power steering gear (all except
left-hand-drive models with
ABS) - removal and refitting
29 Steering column flexible
coupling - removal and refitting
10•20 Suspension and steering systems
30.6 U-shaped Ford spanner for
unscrewing the steering gear mounting
bolts
30.8 Using an adaptor to fit the Teflon
rings to the union nuts
1 Adaptor 2 Teflon ring 3 Union nut
4 Groove location for the Teflon ring
30.9 Tightening the steering gear
mounting bolts using the U-shaped
spanner (arrowed)
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Chapter 12 Body electrical system
Air bag clock spring - removal and refitting . . . . . . . . . . . . . . . . . . . 30
Air bag control module - removal and refitting . . . . . . . . . . . . . . . . . 29
Air bag unit (driver’s side) - removal and refitting . . . . . . . . . . . . . . . 28
Anti-theft alarm system - general information . . . . . . . . . . . . . . . . . . 20
Auxiliary warning system - general information and
component renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Battery - check, maintenance and charging . . . . . . . . See Chapter 1
Battery - removal and refitting . . . . . . . . . . . . . . . . . . . See Chapter 5
Bulbs (exterior lights) - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Bulbs (interior lights) - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Clock - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Compact disc player - removal and refitting . . . . . . . . . . . . . . . . . . . 25
Cruise control system - general information . . . . . . . . . . . . . . . . . . . 21
Electrical fault finding - general information . . . . . . . . . . . . . . . . . . . 2
Electrical system check . . . . . . . . . . . . . . . . . . . . . . . . See Chapter 1
Exterior light units - removal and refitting . . . . . . . . . . . . . . . . . . . . . 7
Fuses, relays and timer module - testing and renewal . . . . . . . . . . . 3
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Headlight beam alignment - checking and adjustment . . . . . . . . . . 8
Headlight levelling motor - removal and refitting . . . . . . . . . . . . . . . 9Horn - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Instrument panel - removal and refitting . . . . . . . . . . . . . . . . . . . . . . 10
Instrument panel components - removal and refitting . . . . . . . . . . . 11
Radio aerial - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Radio/cassette player - coding, removal and refitting . . . . . . . . . . . 23
Radio/cassette player power amplifier - removal and refitting . . . . . 24
Speakers - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Speedometer drive cable - removal and refitting . . . . . . . . . . . . . . . 12
Stop-light switch - removal and refitting . . . . . . . . . . . See Chapter 9
Switches - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Tailgate wiper motor assembly - removal and refitting . . . . . . . . . . . 17
TCS inhibition switch - removal and refitting . . . . . . . . See Chapter 9
Trip computer module - removal and refitting . . . . . . . . . . . . . . . . . 18
Windscreen/tailgate washer system and wiper blade
check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Chapter 1
Windscreen/tailgate washer system components - removal
and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Windscreen wiper motor and linkage - removal and refitting . . . . . . 16
Wiper arms - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Fuses (auxiliary fusebox in engine compartment)
Note:Fuse ratings and circuits are liable to change from year to year. Consult the handbook supplied with the vehicle, or consult a Ford dealer,
for specific information.
Fuse No Rating Colour Circuit(s) protected
1 80 Black . . . . . . . . . . . . . . . . . . . . . . . . . . Power supply to main fusebox
2 60 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . Radiator electric cooling fans
3 60 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . Diesel engine glow plugs and/or ABS braking system
4 20 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . Ignition system, or ignition and daytime running lights
5 30 Light green . . . . . . . . . . . . . . . . . . . . . . Heated windscreen (left-hand side)
6 30 Light green . . . . . . . . . . . . . . . . . . . . . . Heated windscreen (right-hand side)
7 30 Light green . . . . . . . . . . . . . . . . . . . . . . ABS braking system
8 30 Light green . . . . . . . . . . . . . . . . . . . . . . Air conditioning compressor/heated seats or air conditioning
compressor/daytime running lights
9 20 Light blue . . . . . . . . . . . . . . . . . . . . . . . ECU (petrol), Cold start solenoid (Diesel)
10 20 Light blue . . . . . . . . . . . . . . . . . . . . . . . Ignition switch
11 3 Violet . . . . . . . . . . . . . . . . . . . . . . . . . . ECU memory
12 15 Light blue . . . . . . . . . . . . . . . . . . . . . . . Horn and hazard flasher warning system
13 15 Light blue . . . . . . . . . . . . . . . . . . . . . . . Oxygen sensor
14 15 Light blue . . . . . . . . . . . . . . . . . . . . . . . Fuel pump
15 10 Red . . . . . . . . . . . . . . . . . . . . . . . . . . . Dipped beam headlight (right-hand side)
16 10 Red . . . . . . . . . . . . . . . . . . . . . . . . . . . Dipped beam headlight (left-hand side)
17 10 Red . . . . . . . . . . . . . . . . . . . . . . . . . . . Main beam headlight (right-hand side)
18 10 Red . . . . . . . . . . . . . . . . . . . . . . . . . . . Main beam headlight (left-hand side)
12•1
Easy,suitable for
novice with little
experienceFairly easy,suitable
for beginner with
some experienceFairly difficult,suitable
for competent DIY
mechanicDifficult,suitable for
experienced DIY
mechanicVery difficult,
suitable for expert DIY
or professional
Degrees of difficulty
Specifications Contents
12
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Fuses (main fusebox in passenger compartment)
Note:Fuse ratings and circuits are liable to change from year to year. Consult the handbook supplied with the vehicle, or consult a Ford dealer,
for specific information.
Fuse Rating Colour Circuit(s) protected
19 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Heated door mirrors
20 10 Black . . . . . . . . . . . . . . . . . . . . . . . . . . Front/rear wiper motor (circuit breaker)
21 30 Light green . . . . . . . . . . . . . . . . . . . . . . Front electric windows (only)
21 40 Orange . . . . . . . . . . . . . . . . . . . . . . . . . Front and rear electric windows
22 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . ABS module
23 15 Light blue . . . . . . . . . . . . . . . . . . . . . . . Reversing lights
24 15 Light blue . . . . . . . . . . . . . . . . . . . . . . . Stop-lights
25 20 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . Central locking system/double-locking/anti-theft alarm
26 20 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . Foglights
27 15 Light blue . . . . . . . . . . . . . . . . . . . . . . . Cigar lighter
28 30 Light green . . . . . . . . . . . . . . . . . . . . . . Headlight washer system
29 30 Light green . . . . . . . . . . . . . . . . . . . . . . Heated rear window
30 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Interior lighting and auxiliary warning system
31 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Instrument panel illumination
32 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Radio
33 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Front and rear sidelights (left-hand side)
34 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Interior lighting and digital clock
35 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Front and rear sidelights (right-hand side)
36 30 Light green . . . . . . . . . . . . . . . . . . . . . . Air bag
37 30 Light green . . . . . . . . . . . . . . . . . . . . . . Heater blower
38 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Adaptive damping
Relays (auxiliary fusebox in engine compartment)
Relay Colour Circuit(s) protected
R1 Green . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Daytime running lights (left-hand-drive, but not all countries) or dim-
dip lights (UK)
R2 Black . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radiator electric cooling fan (high speed)
R3 Blue (petrol) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air conditioning cut-out
R3 Brown (Diesel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air conditioning in conjunction with Diesel engine
R4 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Windscreen heater time delay
R5 Dark green (petrol) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radiator electric cooling fan (low speed)
R5 Black (Diesel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radiator electric cooling fan (low speed)
R6 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Starter solenoid
R7 Brown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Horns
R8 Brown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel pump
R9 White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dipped beam headlights
R10 White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main beam headlights
R11 Brown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ECU power supply (petrol), cold start (Diesel)
Relays (main fusebox in passenger compartment)
Relay Colour Circuit(s) protected
R12 White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interior, courtesy and footwell lights
R13 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heated rear window
R14 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heater blower
R15 Green . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Windscreen wiper motor
R16 Black . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ignition
Auxiliary relays (not in the fuseboxes)
Relay Colour Circuit(s) protected Location
R17 Black . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diesel glow plug Battery tray
R18 Black . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . “One-touch down” Driver’s door
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . driver’s window relay
R19 Blue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Speed control cut-off Central fuse box bracket the
below instrument panel
R20 Blue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Headlight washer system Bulb module bracket
R21 Orange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rear screen wiper interval Bulb module bracket
R22 White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Foglights (left-hand-drive only) Interface module bracket
R23 Black . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Direction indicators Steering column
R24 White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anti-theft alarm (left-hand side) Door lock module bracket
R25 White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anti-theft alarm (right-hand side) Door lock module bracket
R26 Black . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heated seats Door lock module bracket
12•2 Body electrical system
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BulbsWattage Type
Headlight main beam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Halogen
Headlight dipped beam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Halogen
Foglights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Halogen
Sidelights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Wedge
Direction indicator lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Bayonet
Side repeater lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Wedge
Stop-lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Bayonet
Reversing lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Bayonet
Rear fog/tail lights (Saloon and Estate) . . . . . . . . . . . . . . . . . . . . . . . . . . 21/4 Bayonet
Rear tail light (Saloon and Hatchback) . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Bayonet
Number plate lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Festoon
Engine compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Wedge
Interior lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Festoon
Reading light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Wedge
Torque wrench settingsNm lbf ft
Windscreen wiper motor bolts:
Into old motor (see text) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6
Into new motor (see text) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9
Body electrical system 12•3
12
Warning: Before carrying out any
work on the electrical system,
read through the precautions
given in “Safety first!” at the beginning of
this manual.The electrical system is of 12-volt negative
earth type. Power for the lights and all
electrical accessories is supplied by a
lead/acid battery which is charged by the
alternator.
This Chapter covers repair and service
procedures for the various electrical
components not associated with the engine.
Information on the battery, ignition system,alternator, and starter motor can be found in
Chapter 5.
All models are fitted with a driver’s air bag,
which is designed to prevent serious chest
and head injuries to the driver during an
accident. A similar bag for the front seat
passenger is also available (see illustration).
The sensor and electronic unit for the air bag
is located next to the steering column inside
the vehicle, and contains a back-up capacitor,
crash sensor, decelerometer, safety sensor,
integrated circuit and microprocessor (see
illustration). The air bag is inflated by a gas
generator, which forces the bag out of the
module cover in the centre of the steering
wheel. A “clock spring” ensures that a good
electrical connection is maintained with the air
bag at all times - as the steering wheel is
turned in each direction, the spring winds and
unwinds.
All UK models are fitted with an alarm
system incorporating a movement sensor and
ignition immobiliser. On Saloon and
Hatchback models, the alarm system horn is
located on the left-hand side of the luggage
1 General information
1.3A Air bag system components
1 Air bag module (driver’s)
2 Clock spring3 Diagnostic and sensor unit
4 Air bag indicator light5 Air bag module
(passenger’s)
1.3B Air bag sensor and electronic unit
1 Crash sensor
2 Safety sensor
3 Voltage back-up
4 Application Specific Integrated Circuit
5 Microprocessor
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compartment, but on Estate models, it is on
the right-hand side.
Some models are fitted with a headlight
levelling system, which is controlled by a knob
on the facia. On position “0”, the headlights
are in their base position, and on position “5”,
the headlights are in their maximum inclined
angle.
It should be noted that, when portions of
the electrical system are serviced, the cable
should be disconnected from the battery
negative terminal, to prevent electrical shorts
and fires.
Caution: When disconnecting the
battery for work described in the
following Sections, refer to
Chapter 5, Section 1.
Note:Refer to the precautions given in
“Safety first!” and in Section 1 of this Chapter
before starting work. The following tests relate
to testing of the main electrical circuits, and
should not be used to test delicate electronic
circuits (such as engine management systems,
anti-lock braking systems, etc), particularly
where an electronic control module is used.
Also refer to the precautions given in Chapter
5, Section 1.
General
1A typical electrical circuit consists of an
electrical component, any switches, relays,
motors, fuses, fusible links or circuit breakers
related to that component, and the wiring and
connectors which link the component to both
the battery and the chassis. To help to
pinpoint a problem in an electrical circuit,
wiring diagrams are included at the end of this
manual.
2Before attempting to diagnose an electrical
fault, first study the appropriate wiring
diagram, to obtain a complete understanding
of the components included in the particular
circuit concerned. The possible sources of a
fault can be narrowed down by noting if other
components related to the circuit are
operating properly. If several components or
circuits fail at one time, the problem is likely to
be related to a shared fuse or earth
connection.
3Electrical problems usually stem from
simple causes, such as loose or corroded
connections, a faulty earth connection, a
blown fuse, a melted fusible link, or a faulty
relay (refer to Section 3 for details of testing
relays). Visually inspect the condition of all
fuses, wires and connections in a problem
circuit before testing the components. Use
the wiring diagrams to determine which
terminal connections will need to be checked
in order to pinpoint the trouble-spot.
4The basic tools required for electrical fault-
finding include a circuit tester or voltmeter (a
12-volt bulb with a set of test leads can alsobe used for certain tests); an ohmmeter (to
measure resistance and check for continuity);
a battery and set of test leads; and a jumper
wire, preferably with a circuit breaker or fuse
incorporated, which can be used to bypass
suspect wires or electrical components.
Before attempting to locate a problem with
test instruments, use the wiring diagram to
determine where to make the connections.
5To find the source of an intermittent wiring
fault (usually due to a poor or dirty
connection, or damaged wiring insulation), a
“wiggle” test can be performed on the wiring.
This involves wiggling the wiring by hand to
see if the fault occurs as the wiring is moved.
It should be possible to narrow down the
source of the fault to a particular section of
wiring. This method of testing can be used in
conjunction with any of the tests described in
the following sub-Sections.
6Apart from problems due to poor
connections, two basic types of fault can
occur in an electrical circuit - open-circuit, or
short-circuit.
7Open-circuit faults are caused by a break
somewhere in the circuit, which prevents
current from flowing. An open-circuit fault will
prevent a component from working.
8Short-circuit faults are caused by a “short”
somewhere in the circuit, which allows the
current flowing in the circuit to “escape” along
an alternative route, usually to earth. Short-
circuit faults are normally caused by a
breakdown in wiring insulation, which allows a
feed wire to touch either another wire, or an
earthed component such as the bodyshell. A
short-circuit fault will normally cause the
relevant circuit fuse to blow.
Finding an open-circuit
9To check for an open-circuit, connect one
lead of a circuit tester or the negative lead of a
voltmeter either to the battery negative
terminal or to a known good earth.
10Connect the other lead to a connector in
the circuit being tested, preferably nearest to
the battery or fuse. At this point, battery
voltage should be present, unless the lead
from the battery or the fuse itself is faulty
(bearing in mind that some circuits are live
only when the ignition switch is moved to a
particular position).
11Switch on the circuit, then connect the
tester lead to the connector nearest the circuit
switch on the component side.
12If voltage is present (indicated either by
the tester bulb lighting or a voltmeter reading,
as applicable), this means that the section of
the circuit between the relevant connector
and the switch is problem-free.
13Continue to check the remainder of the
circuit in the same fashion.
14When a point is reached at which no
voltage is present, the problem must lie
between that point and the previous test point
with voltage. Most problems can be traced to
a broken, corroded or loose connection.
Finding a short-circuit
15To check for a short-circuit, first
disconnect the load(s) from the circuit (loads
are the components which draw current from
a circuit, such as bulbs, motors, heating
elements, etc).
16Remove the relevant fuse from the circuit,
and connect a circuit tester or voltmeter to the
fuse connections.
17Switch on the circuit, bearing in mind that
some circuits are live only when the ignition
switch is moved to a particular position.
18If voltage is present (indicated either by
the tester bulb lighting or a voltmeter reading,
as applicable), this means that there is a
short-circuit.
19If no voltage is present during this test,
but the fuse still blows with the load(s)
reconnected, this indicates an internal fault in
the load(s).
Finding an earth fault
20The battery negative terminal is
connected to “earth” - the metal of the
engine/transmission unit and the vehicle body
- and many systems are wired so that they
only receive a positive feed, the current
returning via the metal of the car body. This
means that the component mounting and the
body form part of that circuit. Loose or
corroded mountings can therefore cause a
range of electrical faults, ranging from total
failure of a circuit, to a puzzling partial failure.
In particular, lights may shine dimly (especially
when another circuit sharing the same earth
point is in operation), motors (eg wiper motors
or the radiator cooling fan motor) may run
slowly, and the operation of one circuit may
have an apparently-unrelated effect on
another. Note that on many vehicles, earth
straps are used between certain components,
such as the engine/transmission and the
body, usually where there is no metal-to-
metal contact between components, due to
flexible rubber mountings, etc.
21To check whether a component is
properly earthed, disconnect the battery (refer
to Chapter 5, Section 1) and connect one lead
of an ohmmeter to a known good earth point.
Connect the other lead to the wire or earth
connection being tested. The resistance
reading should be zero; if not, check the
connection as follows.
22If an earth connection is thought to be
faulty, dismantle the connection, and clean
both the bodyshell and the wire terminal (or
the component earth connection mating
surface) back to bare metal. Be careful to
remove all traces of dirt and corrosion, then
use a knife to trim away any paint, so that a
clean metal-to-metal joint is made. On
reassembly, tighten the joint fasteners
securely; if a wire terminal is being refitted,
use serrated washers between the terminal
and the bodyshell, to ensure a clean and
secure connection. When the connection is
2 Electrical fault finding -
general information
12•4 Body electrical system
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remade, prevent the onset of corrosion in the
future by applying a coat of petroleum jelly or
silicone-based grease, or by spraying on (at
regular intervals) a proprietary ignition sealer
such as Holts Damp Start, or a water-
dispersant lubricant such as Holts Wet Start.
Note:It is important to note that the ignition
switch and the appropriate electrical circuit
must always be switched off before any of the
fuses (or relays) are removed and renewed. In
the event of the fuse/relay unit having to be
removed, the battery earth lead must be
disconnected. When reconnecting the battery,
reference should be made to Chapter 5.
1Fuses are designed to break a circuit when
a predetermined current is reached, in order
to protect components and wiring which
could be damaged by excessive current flow.
Any excessive current flow will be due to a
fault in the circuit, usually a short-circuit (see
Section 2). The main fusebox, which also
carries some relays, is located inside the
vehicle below the facia panel on the
passenger’s side, and is accessed by a lever
behind the glovebox (see illustration).
2A central timer module is located on the
bottom of the main fusebox. This module
contains the time control elements for the
heated rear window, interior lights and
intermittent wiper operation. The module also
activates a warning buzzer/chime when the
vehicle is left with the lights switched on, or if
a vehicle fitted with automatic transmission is
not parked in position “P”.
3The auxiliary fusebox is located on the front
left-hand side of the engine compartment,
and is accessed by unclipping and removing
the cover. The auxiliary fusebox also contains
some relays (see illustration). Each circuit is
identified by numbers on the main fusebox
and on the inside of the auxiliary fusebox
cover. Reference to the fuse chart in the
Specifications at the start of this Chapter will
indicate the circuits protected by each fuse.
Plastic tweezers are attached to the main
fusebox and to the inside face of the auxiliary
fuse and block cover, to remove and fit the
fuses and relays.
4To remove a fuse, use the tweezers
provided to pull it out of the holder. Slide the
fuse sideways from the tweezers. The wire
within the fuse is clearly visible, and it will be
broken if the fuse is blown (see illustration).
5Always renew a fuse with one of an
identical rating. Never substitute a fuse of a
higher rating, or make temporary repairs using
wire or metal foil; more serious damage, or
even fire, could result. The fuse rating is
stamped on top of the fuse. Never renew a
fuse more than once without tracing the
source of the trouble.
6Spare fuses of various current ratings areprovided in the cover of the auxiliary fusebox.
Note that if the vehicle is to be laid up for a
long period, fuse 34 in the main fusebox
should be removed, to prevent the ancillary
electrical components from discharging the
battery.
7Relays are electrically-operated switches,
which are used in certain circuits. The various
relays can be removed from their respective
locations by carefully pulling them from the
sockets. Each relay in the fuseboxes has a
plastic bar on its upper surface to enable the
use of the tweezers. The locations and
3 Fuses, relays and timer
module- testing and renewal
Body electrical system 12•5
12
3.4 The fuses can be checked visually to
determine if they are blown
3.1 Main fusebox layout
1 Fuse/relay removal tweezers 2 Diode 3 Multi-plug connections
3.3 Auxiliary fusebox layout
1 Fuses 1 to 3 3 Relays R2, R5 and R6 5 Relay sockets for relays R1 and R4
2 Fuses 4 to 8, 11 to 14 4 Relays R7 to R11 6 Diode
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functions of the various relays are given in the
Specifications (see illustration).
8If a component controlled by a relay
becomes inoperative and the relay is suspect,
listen to the relay as the circuit is operated. If
the relay is functioning, it should be possible
to hear it click as it is energized. If the relay
proves satisfactory, the fault lies with the
components or wiring of the system. If the
relay is not being energized, then either the
relay is not receiving a switching voltage, or
the relay itself is faulty. (Do not overlook the
relay socket terminals when tracing faults.)
Testing is by the substitution of a known good
unit, but be careful; while some relays are
identical in appearance and in operation,
others look similar, but perform different
functions.9The central timer module located on the
bottom of the main fusebox incorporates its
own self-diagnosis function. Note that
diagnosis cannot take place if the heated rear
window is defective.
10To activate the system, press the heated
rear window button while the ignition is being
switched on, then release the button. Operate
the light switch, washer pump switch and all
of the door switches one after the other, and
check that the buzzer confirms that the input
signals are correct.
11Now move the wiper lever to the
intermittent wipe position, and check the
output signals by operating the same
switches.
12The self-diagnosis function is turned off
by switching the ignition off and on again.
Removal
Ignition switch and lock barrel
1Disconnect the battery negative (earth) lead
(refer to Chapter 5, Section 1).
2Remove the rubber gaiters and locking
rings, then remove the securing screws and
take off the steering column upper and lower
shrouds.
3Insert the ignition key, and turn it to the
accessory position. Using a small screwdriver
or twist drill through the hole in the side of the
lock housing, depress the locking plunger and
withdraw the lock barrel (see illustrations).
4The switch may be removed from the
steering column assembly by disconnecting
the multi-plug, then using a screwdriver to
release the switch retaining tab (see
illustrations).
Windscreen wiper multi-function
switch
5Disconnect the battery negative (earth) lead
(refer to Chapter 5, Section 1).
6Remove the rubber gaiters and locking
rings, then remove the securing screws and
take off the steering column upper shroud.
7Disconnect the multi-plug (see illustration).
8Depress the plastic tab with a screwdriver,
and lift the switch assembly from the steering
column (see illustrations).
4 Switches - removal and refitting
12•6 Body electrical system
3.7 “One-touch down” window relay in the
driver’s door4.3A Depress the locking plunger . . .4.3B . . . and withdraw the ignition lock
barrel
4.7 Disconnecting the multi-plug from the
windscreen wiper multi-function switch4.8A Depress the plastic tab with a
screwdriver . . .
4.4A Release the retaining tab . . .4.4B . . . and remove the ignition switch
4.8B . . . and remove the windscreen wiper
multi-function switch
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the specified mileage (or time) since the last
service has been reached.
4To reset the service interval system and
turn off the light, a switch inside the glovebox
must be depressed for a minimum of 4
seconds with the ignition switched on. This
should be carried out by a Ford dealer if the
vehicle is still in the warranty period.
Component renewal
5The following paragraphs describe brief
removal procedures for the auxiliary warning
system components. Disconnect the battery
negative (earth) lead before commencing
work (refer to Chapter 5, Section 1). Refitting
procedures are a reversal of removal.
Display warning bulb
6Remove the control assembly.
7Prise off the cover, and pull out the relevant
bulb and bulbholder.
Low air temperature warning sender
unit
8Remove the front bumper.
9Unclip the sender unit and disconnect the
multi-plug (see illustration).
Engine oil level sensor
10Apply the handbrake, jack up the front of
the vehicle and support it on axle stands.
11Place a container beneath the oil level
sensor, to catch any spilt oil.12Unscrew the screws and remove the
cover from the sensor.
13Disconnect the multi-plug.
14Unscrew and remove the sensor, and
remove the seal (see illustration).
Door ajar sensor
15Remove the door lock as described in
Chapter 11, Section 14.
16Unclip the sensor and disconnect the
multi-plug.
Low coolant warning switch
17Refer to Chapter 3, Section 6.
Low washer fluid switch
18Disconnect the multi-plug from the
washer fluid reservoir.
19Drain or syphon out the fluid from the
reservoir.
20Using a screwdriver, lever out the switch
from the reservoir (see illustration).
Service indicator reset switch
21Remove the glove compartment lid as
described in Chapter 11, Section 32.
22Carefully lever out the switch using a
small screwdriver.
23Remove the rear cover and disconnect
the wiring (see illustration).
Control assembly
24Remove the instrument panel surround,
referring to Section 10.25Unscrew the mounting screws,
disconnect the multi-plugs and remove the
assembly.
Bulb failure module
26Remove the lower facia panel from under
the steering wheel.
27Unclip the bulb failure module and
disconnect the multi-plug.
Note: From November 1993, for added
security, a complex Bosch immobiliser system
was fitted to some models. For further details,
refer to your Ford dealer.
1All UK models are fitted with an anti-theft
alarm system, incorporating movement
sensors and an ignition immobiliser. The
system is activated when the vehicle is
locked.
2The system includes a start inhibitor circuit,
which makes it impossible to start the engine
with the system armed.
3The movement sensors consist of two
ultrasonic units, located in the “B” pillars,
incorporating transmitters and receivers (see
illustrations). The receivers check that the
echo frequency matches the original
frequency. If there is any significant
difference, the system triggers the alarm.
20 Anti-theft alarm system- general
information
12•18 Body electrical system
19.9 Low air temperature sender unit
removal
1 Clip 2 Sender unit 3 Multi-plug19.14 Engine oil level sensor removal
1 Cover 2 Multi-plug 3 Sensor 4 Seal19.20 Removing the low washer fluid
switch
19.23 Service indicator switch removal
1 Lever out the switch 2 Cover 3 Wiring20.3A Disconnecting a movement sensor
multi-plug20.3B Removing a movement sensor
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