FORD FIESTA 1989 Service Repair Manual

1 General information,precautions and battery
disconnection
General information
The engine electrical system consists
mainly of the charging and starting systems.
Because of their engine-related functions,
these components are covered separately
from the body electrical devices such as the
lights, instruments, etc (which are covered in
Chapter 12). Information on the ignition
system is covered in Part B of this Chapter.
The electrical system is of the 12-volt
negative earth type. The battery is of the low maintenance or
“maintenance-free” (sealed for life) type and is
charged by the alternator, which is belt-driven
from the crankshaft pulley. The starter motor is of the pre-engaged
type incorporating an integral solenoid. On
starting, the solenoid moves the drive pinion
into engagement with the flywheel ring gear
before the starter motor is energised. Once
the engine has started, a one-way clutch
prevents the motor armature being driven by
the engine until the pinion disengages from
the flywheel.
Precautions
Further details of the various systems are
given in the relevant Sections of this Chapter.
While some repair procedures are given, the
usual course of action is to renew the
component concerned. The owner whose
interest extends beyond mere component
renewal should obtain a copy of the
“Automobile Electrical & Electronic Systems
Manual” , available from the publishers of this
manual. It is necessary to take extra care when
working on the electrical system to avoid
damage to semi-conductor devices (diodes
and transistors), and to avoid the risk of
personal injury. In addition to the precautions
given in “Safety first!” at the beginning of this
manual, observe the following when working
on the system:
Always remove rings, watches, etc before
working on the electrical system. Even with
the battery disconnected, capacitive
discharge could occur if a component’s live
terminal is earthed through a metal object.
This could cause a shock or nasty burn. Do not reverse the battery connections.
Components such as the alternator, electronic
control units, or any other components having
semi-conductor circuitry could be irreparably
damaged. If the engine is being started using jump
leads and a slave battery, connect the
batteries positive-to-positive and negative-to-
negative (see “Jump starting” ). This also
applies when connecting a battery charger.
Never disconnect the battery terminals, the
alternator, any electrical wiring or any test instruments when the engine is running.
Do not allow the engine to turn the
alternator when the alternator is not
connected. Never “test” for alternator output by
“flashing” the output lead to earth.
Never use an ohmmeter of the type
incorporating a hand-cranked generator for
circuit or continuity testing.
Always ensure that the battery negative lead
is disconnected when working on the
electrical system. Before using electric-arc welding
equipment on the car, disconnect the battery,
alternator and components such as the fuel
injection/ignition electronic control unit to
protect them from the risk of damage.
Battery disconnection
Several systems fitted to the vehicle require
battery power to be available at all times, either
to ensure that their continued operation (such as
the clock) or to maintain control unit memories
(such as that in the engine management
system’s ECU) which would be wiped if the
battery were to be disconnected. Whenever the
battery is to be disconnected therefore, first note
the following, to ensure that there are no
unforeseen consequences of this action:
a) First, on any vehicle with central locking, it is a wise precaution to remove the key
from the ignition, and to keep it with you,
so that it does not get locked in, if the
central locking should engage accidentally
when the battery is reconnected.
b) On cars equipped with an engine
management system, the system’s ECU will
lose the information stored in its memory -
referred to by Ford as the “KAM” (Keep-
Alive Memory) - when the battery is
disconnected. This includes idling and
operating values, and any fault codes
detected - in the case of the fault codes, if
it is thought likely that the system has
developed a fault for which the
corresponding code has been logged, the
vehicle must be taken to a Ford dealer for
the codes to be read, using the special
diagnostic equipment necessary for this.
Whenever the battery is disconnected, the
information relating to idle speed control
and other operating values will have to be
re-programmed into the unit’s memory.
The ECU does this by itself, but until then,
there may be surging, hesitation, erratic idle
and a generally inferior level of
performance. To allow the ECU to relearn
these values, start the engine and run it as
close to idle speed as possible until it
reaches its normal operating temperature,
then run it for approximately two minutes at
1200 rpm. Next, drive the vehicle as far as
necessary - approximately 5 miles of varied
driving conditions is usually sufficient - to
complete the relearning process.
c) If the battery is disconnected while the alarm system is armed or activated, the
alarm will remain in the same state when the battery is reconnected. The same
applies to the engine immobiliser system
(where fitted).
d) If a Ford “Keycode” audio unit is fitted,
and the unit and/or the battery is
disconnected, the unit will not function
again on reconnection until the correct
security code is entered. Details of this
procedure, which varies according to the
unit and model year, are given in the
“Ford Audio Systems Operating Guide”
supplied with the vehicle when new, with
the code itself being given in a “Radio
Passport” and/or a “Keycode Label” at
the same time. Ensure you have the
correct code before you disconnect the
battery. For obvious security reasons, the
procedure is not given in this manual. If
you do not have the code or details of the
correct procedure, but can supply proof
of ownership and a legitimate reason for
wanting this information, the vehicle’s
selling dealer may be able to help.
Devices known as “memory-savers” (or
“code-savers”) can be used to avoid some of
the above problems. Precise details vary
according to the device used. Typically, it is
plugged into the cigarette lighter, and is
connected by its own wires to a spare battery;
the vehicle’s own battery is then disconnected
from the electrical system, leaving the
“memory-saver” to pass sufficient current to
maintain audio unit security codes and ECU
memory values, and also to run permanently-
live circuits such as the clock, all the while
isolating the battery in the event of a short-
circuit occurring while work is carried out.
Warning: Some of these devices
allow a considerable amount of
current to pass, which can mean
that many of the vehicle’s
systems are still operational when the
main battery is disconnected. If a
“memory-saver” is used, ensure that the
circuit concerned is actually “dead” before
carrying out any work on it!
2 Electrical fault finding - general information
Refer to Chapter 12.
3 Battery -testing and charging
1
Standard and low maintenance
battery - testing
1If the vehicle covers a small annual mileage,
it is worthwhile checking the specific gravity
of the electrolyte every three months to
determine the state of charge of the battery.
Use a hydrometer to make the check and
compare the results with the following table.
5A•2 Starting and charging systems
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Ambient Ambient
temperature temperature
abovebelow
25°C (77°F) 25°C (77°F)
Fully-charged 1.210 to 1.230 1.270 to 1.290
70% charged 1.170 to 1.190 1.230 to 1.250
Fully-discharged 1.050 to 1.070 1.110 to 1.130
Note that the specific gravity readings
assume an electrolyte temperature of
15°C (60°F); for every 10°C (18°F) below 15°C
(60°F) subtract 0.007. For every 10°C (18°F)
above 15°C (60°F) add 0.007.
2 If the battery condition is suspect, first
check the specific gravity of electrolyte in
each cell. A variation of 0.040 or more
between any cells indicates loss of electrolyte
or deterioration of the internal plates.
3 If the specific gravity variation is 0.040 or
more, the battery should be renewed. If the
cell variation is satisfactory but the battery is
discharged, it should be charged as
described later in this Section.
Maintenance-free battery -
testing
4 In cases where a “sealed for life”
maintenance-free battery is fitted, topping-up
and testing of the electrolyte in each cell is not
possible. The condition of the battery can
therefore only be tested using a battery
condition indicator or a voltmeter.
5 If testing the battery using a voltmeter,
connect the voltmeter across the battery and
compare the result with those given in the
Specifications under “charge condition”. The
test is only accurate if the battery has not
been subjected to any kind of charge for the
previous six hours. If this is not the case,
switch on the headlights for 30 seconds, then
wait four to five minutes before testing the
battery after switching off the headlights. All
other electrical circuits must be switched off,
so check that the doors and tailgate are fully
shut when making the test.
6 If the voltage reading is less than 12.2 volts,
then the battery is discharged, whilst a
reading of 12.2 to 12.4 volts indicates a
partially discharged condition.
7 If the battery is to be charged, remove it
from the vehicle (Section 4) and charge it as
described later in this Section.
Standard and low maintenance
battery - charging
Note: The following is intended as a guide
only. Always refer to the manufacturer’s
recommendations (often printed on a label
attached to the battery) before charging a
battery.
8 Charge the battery at a rate of 3.5 to
4 amps and continue to charge the battery at
this rate until no further rise in specific gravity
is noted over a four hour period.
9 Alternatively, a trickle charger charging at
the rate of 1.5 amps can safely be used
overnight.
10 Specially rapid “boost” charges which are
claimed to restore the power of the battery in 1 to 2 hours are not recommended, as they
can cause serious damage to the battery
plates through overheating.
11
While charging the battery, note that the
temperature of the electrolyte should never
exceed 37.8°C (100°F).
Maintenance-free battery -
charging
Note: The following is intended as a guide
only. Always refer to the manufacturer’s
recommendations (often printed on a label
attached to the battery) before charging a
battery.
12 This battery type takes considerably
longer to fully recharge than the standard
type, the time taken being dependent on the
extent of discharge, but it can take anything
up to three days.
13 A constant voltage type charger is
required, to be set, when connected, to 13.9
to 14.9 volts with a charger current below
25 amps. Using this method, the battery
should be usable within three hours, giving a
voltage reading of 12.5 volts, but this is for a
partially discharged battery and, as
mentioned, full charging can take
considerably longer.
14 If the battery is to be charged from a fully
discharged state (condition reading less than
12.2 volts), have it recharged by your Ford
dealer or local automotive electrician, as the
charge rate is higher and constant supervision
during charging is necessary.
4 Battery -
removal and refitting
1
Note: Refer to the precautions in Section 1
before starting work.
Removal
1 The battery is located forward on the left-
hand side of the engine compartment, on a
platform welded to the vehicle structure.
2 Undo the retaining nut, then detach the
earth leads from the stud of the battery
negative (earth) terminal post. This is the
terminal to disconnect before working on, or
disconnecting, any electrical component on
the vehicle.
3 Pivot up the plastic cover from the positive
terminal, then unscrew the positive lead
retaining nut on the terminal. Detach the
positive lead from the terminal.
4 Release the clamp securing the battery to
its platform and remove it. Lift the battery
from its location, keeping it in an upright
position to avoid the possibility of corrosive
electrolyte spilling onto the paintwork.
5 Clean the battery terminal posts, clamps
and the battery casing. If the bulkhead is
rusted as a result of battery acid spilling onto
it, clean it thoroughly and re-paint with
reference to Chapter 1. 6
If you are renewing the battery, make sure
that you get one that’s identical, with the
same dimensions, amperage rating, cold
cranking rating, etc. Dispose of the old battery
in a responsible fashion. Most local authorities
have facilities for the collection and disposal
of such items - batteries contain sulphuric
acid and lead, and should not be simply
thrown out with the household rubbish!
Refitting
7 Refitting is a reversal of removal. Smear the
battery terminals with a petroleum-based jelly
prior to reconnecting. Always connect the
positive terminal clamp first and the negative
terminal clamp last.
5 Charging system - testing
2
Note:Refer to the precautions in Section 1
before starting work.
1 If the ignition warning light fails to
illuminate when the ignition is switched on,
first check the alternator wiring connections
for security. If satisfactory, check that the
warning light bulb has not blown, and that
the bulbholder is secure in its location in the
instrument panel. If the light still fails to
illuminate, check the continuity of the
warning light feed wire from the alternator to
the bulbholder. If all is satisfactory, the
alternator is at fault and should be renewed
or taken to an auto-electrician for testing and
repair.
2 If the ignition warning light illuminates when
the engine is running, stop the engine and
check that the drivebelt is correctly tensioned
(see Chapter 1) and that the alternator
connections are secure. If all is so far
satisfactory, have the alternator checked by
an auto-electrician for testing and repair.
3 If the alternator output is suspect even
though the warning light functions correctly,
the regulated voltage may be checked as
follows.
4 Connect a voltmeter across the battery
terminals and start the engine.
5 Increase the engine speed until the
voltmeter reading remains steady; the
reading should be approximately 13.5 to
14.6 volts.
6 Switch on as many electrical accessories
(eg, the headlights, heated rear window and
heater blower) as possible, and check that the
alternator maintains the regulated voltage at
around 13 to 14 volts.
7 If the regulated voltage is not as stated, the
fault may be due to worn brushes, weak brush
springs, a faulty voltage regulator, a faulty
diode, a severed phase winding or worn or
damaged slip rings. The alternator should be
renewed or taken to an auto-electrician for
testing and repair.
Starting and charging systems 5A•3
5A
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6 Alternator-
removal and refitting
2
Removal
1 Disconnect the battery negative (earth) lead
(refer to Section 1).
2 Chock the rear wheels then jack up the
front of the car and support it on axle stands
(see “Jacking and vehicle support” ).
3 Where applicable, undo the retaining bolts
and remove the drivebelt splash guard (see
illustration) .
4 On models with power steering and a
separate drivebelt, remove the auxiliary
(power steering pump) drivebelt as described
in Chapter 1.
Alternator with manual adjustment
drivebelt
5 On models fitted with a sliding arm type
adjuster strap, unscrew and remove the top
(adjuster) bolt from the strap (see
illustration) .
6 On models fitted with a “rack-and-pinion”
type adjuster, unscrew and remove the
central (locking) bolt whilst, at the same time,
loosening the (adjuster) nut (see illustration).
7 Loosen off, but do not yet remove, the lower mounting bolts, pivot the
alternator inwards towards the engine to
slacken the tension of the drivebelt, then
disengage the drivebelt from the pulleys and
remove it.
8
Where applicable, detach and remove the
alternator splash cover/heat shield (see
illustration) .
9 Where applicable, detach and remove the
phase terminal and the splash cover.
10 Supporting the weight of the alternator
from underneath, unscrew and remove the
mounting bolts. Lower the alternator; noting
the connections, detach the wiring and
remove the alternator from the vehicle (see
illustration) .
Alternator with automatic adjustment
drivebelt
11Remove the heatshield (if fitted) and
disconnect the alternator wiring.
12 Fit a ring spanner onto the drivebelt
tensioner, and rotate it clockwise to loosen off
the tension from the drivebelt (see
illustration) . Note the routing of the drivebelt,
then disengage the belt from the pulleys and
remove it.
13 On pre-1994 model year Zetec engines,
disconnect the oxygen sensor wiring multi-
plug, then undo the two nuts and separate the
exhaust downpipe from the manifold. Support the downpipe to avoid straining the exhaust
system mountings.
14
On all models, unscrew the alternator
upper mounting bolts/nuts and disconnect the
alternator wiring. Unscrew the lower
bolts/nuts and remove the alternator from the
engine. On pre-1994 Zetec engines, it will be
necessary to de-tension the drivebelt
tensioner to provide clearance for removal of
the upper mounting bolt nut.
Refitting
15 Refit in the reverse order of removal. Refit
the drivebelt, and ensure that it is correctly re-
routed around the pulleys. Adjust the tension
of the drivebelt (according to type) as
described in Chapter 1.
7 Alternator brushes and voltage regulator - renewal
3
1Disconnect the battery negative (earth) lead
(refer to Section 1).
2 Remove the alternator from the vehicle as
described in the previous Section.
Bosch
3 Remove the two screws securing the
combined brush box/regulator unit, and
5A•4 Starting and charging systems
6.12 Automatic drivebelt tensioner
Turn tensioner clockwise to release drivebelt tension
6.10 Wiring loom routing on rear ofalternator (CVH engine)6.8 Removing the splash cover from the inner end of the alternator
6.6 Rack-and-pinion type drivebelt adjuster
A Adjuster arm C Central (locking) bolt
B Pinion (adjuster) nut6.5 Alternator sliding arm type adjuster strap
A Adjuster bolt
B Adjuster bracket to engine bolt6.3 Removing the drivebelt splash guard (where fitted)
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withdraw the assembly from the rear of the
alternator (see illustrations) .
4 Check the brush lengths (see illustration).
If either is less than, or close to, the minimum
specified length, renew them by unsoldering
the brush wiring connectors and withdrawing
the brushes and their springs.
5 Clean the slip rings with a solvent-
moistened cloth, then check for signs of
scoring, burning or severe pitting. If evident,
the slip rings should be attended to by an
automobile electrician.
6 Refit in the reverse order of removal.
Magneti-Marelli
7Remove the three screws securing the
regulator/brush box unit on the rear face of the
alternator, partially withdraw the assembly,
detach the field connector, and remove the
unit from the alternator (see illustrations).
8 If the brushes are worn beyond the
minimum allowable length specified, a new
regulator and brush box unit must be fitted;
the brushes are not available separately.
9 Clean the slip rings with a solvent-moistened
cloth, then check for signs of scoring, burning
or severe pitting. If evident, the slip rings should
be attended to by an automobile electrician.
10 Refit in the reverse order of removal.
Mitsubishi
11Hold the pulley nut stationary using an
8 mm Allen key, unscrew the pulley nut and
remove the washer (see illustration).12
Withdraw the pulley, cooling fan, spacer
and dust shield from the rotor shaft.
13 Mark the relative fitted positions of the front
housing, stator and rear housing (to ensure correct re-alignment when reassembling).
Unscrew the through-bolts and remove the front
housing from the rotor shaft, followed by the
dust seal and the thin spacer
(see illustrations).
Starting and charging systems 5A•5
7.4 Measuring the brush lengths (Bosch
alternator)7.3b . . . withdraw the brush box/regulatorunit (Bosch alternator)
7.11 Pulley nut removal on the Mitsubishi alternator
7.13a Exploded view of the Mitsubishi A5T alternator
7.7b Disconnecting the field connector(Magneti-Marelli alternator)7.7a Removing the regulator and brushboxassembly securing screws (Magneti- Marelli alternator)
5A
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7.3a Undo the retaining screw and . . .
A Pulley
B Fan
C Thick spacer
D Through-bolt
E Dust shield
F Drive end unit
G Bearing
H Bearing retainer
J Dust cap
K Thin spacer
L Rotor
M Seal
N Bearing
O Commutator end
P Diode pack
R Brush box
S Stator
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14Remove the rotor from the rear housing
and the stator. If difficulty is experienced, heat
the rear housing with a 200-watt soldering
iron for three or four minutes.
15 Unbolt the rectifier/brush box and stator
assembly from the rear housing (see
illustration) .
16 Unsolder the stator and brush box from
the rectifier, using the very minimum of heat.
Use a pair of pliers as a heat sink to reduce
the heat transference to the diodes
(overheating may cause diode failure).
17 Renew the brushes if they are worn down
to, or beyond, the minimum specified length.
Unsolder the brush wires at the points
indicated (see illustration) , then solder the
new brush leads so that the wear limit line
projects 2 to 3 mm from the end of the holder
(see illustration) .
18 Clean the slip rings with a solvent-
moistened cloth, then check for signs of
scoring, burning or severe pitting. If evident,
the slip rings should be attended to by an
automobile electrician. 19
Refit in the reverse order of removal.
Insert a piece of wire through the access hole
in the rear housing to hold the brushes in the
retracted position as the rotor is refitted (see
illustration) . Do not forget to release the
brushes when assembled.
8 Starting system - testing
1
Note:Refer to the precautions in Section 1
before starting work.
1 If the starter motor fails to operate when the
ignition key is turned to the appropriate
position, the following possible causes may
be to blame.
a) The battery is faulty.
b) The electrical connections between the
switch, solenoid, battery and starter
motor are somewhere failing to pass the
necessary current from the battery
through the starter to earth.
c) The solenoid is faulty.
d) The starter motor is mechanically or
electrically defective. 2
To check the battery, switch on the
headlights. If they dim after a few seconds,
this indicates that the battery is discharged -
recharge (see Section 3) or renew the battery.
If the headlights glow brightly, operate the
ignition switch and observe the lights. If they
dim, then this indicates that current is
reaching the starter motor, therefore the fault
must lie in the starter motor. If the lights
continue to glow brightly (and no clicking
sound can be heard from the starter motor
solenoid), this indicates that there is a fault in
the circuit or solenoid - see following
paragraphs. If the starter motor turns slowly
when operated, but the battery is in good
condition, then this indicates that either the
starter motor is faulty, or there is considerable
resistance somewhere in the circuit.
3 If a fault in the circuit is suspected,
disconnect the battery leads (including the
earth connection to the body), the starter/
solenoid wiring and the engine/transmission
earth strap. Thoroughly clean the
connections, and reconnect the leads and
wiring, then use a voltmeter or test lamp to
check that full battery voltage is available at
the battery positive lead connection to the
solenoid, and that the earth is sound. Smear
petroleum jelly around the battery terminals to
prevent corrosion - corroded connections are
amongst the most frequent causes of
electrical system faults.
5A•6 Starting and charging systems
7.19 Use a length of wire rod to hold
brushes in the retracted position when
reassembling the rotor to the housing on
the Mitsubishi alternator
7.17b Fitted position of new brush on a Mitsubishi alternator7.17a Unsoldering a brush wire on aMitsubishi alternator
7.15 Rectifier/brush box (1) and regulatorunit (3) retaining nuts on the Mitsubishialternator. Note that cap (2) covers the regulator nut
A Pulley nut
B Spring washer
C Pulley
D Through-bolt
E Retainer plate screw
F Drive end housing
G Bearing
H Bearing retaining plate J Spacer
K Rotor
L Spacer
M Slip ring end bearing
N Plug
P Cap
Q Terminal insulator
R Slip ring end housing S Rectifier
T Dust cover
V Regulator
W Brush spring
X Brush
Y Regulator screw
Z Stator
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4If the battery and all connections are in
good condition, check the circuit by
disconnecting the wire from the solenoid
blade terminal. Connect a voltmeter or test
lamp between the wire end and a good earth
(such as the battery negative terminal), and
check that the wire is live when the ignition
switch is turned to the “start” position. If it is,
then the circuit is sound - if not the circuit
wiring can be checked as described in
Chapter 12.
5 The solenoid contacts can be checked by
connecting a voltmeter or test lamp between
the battery positive feed connection on the
starter side of the solenoid, and earth. When
the ignition switch is turned to the “start”
position, there should be a reading or lighted
bulb, as applicable. If there is no reading or
lighted bulb, the solenoid is faulty and should
be renewed.
6 If the circuit and solenoid are proved
sound, the fault must lie in the starter motor.
In this event, it may be possible to have the
starter motor overhauled by a specialist, but
check on the cost of spares before proceeding, as it may prove more economical
to obtain a new or exchange motor.
9 Starter motor
-
removal and refitting
1
Removal
1 Disconnect the battery negative (earth) lead
(refer to Section 1).
2 Chock the rear wheels then jack up the
front of the car and support it on axle stands
(see “Jacking and vehicle support” ). Remove
the front roadwheels.
3 Undo the two retaining nuts, and remove
the starter motor heat shield (where fitted).
4 Prise free the cap, if fitted, then unscrew the
nuts to disconnect the wiring from the
starter/solenoid terminals. Where applicable,
disconnect the oxygen sensor wiring multi-plug
from the locating bracket (see illustration).
5 Unscrew and remove the starter motor
retaining bolts at the transmission/clutch housing and, where applicable, also unbolt
and detach the support bracket. Withdraw the
starter motor from its mounting, and remove it
from the vehicle
(see illustrations) .
Refitting
6Refitting is a reversal of removal. Tighten
the retaining bolts to the specified torque.
Ensure that the wiring is securely reconnected
to the starter motor (and solenoid) and is
routed clear of the exhaust downpipe.
10 Starter motor - testing and overhaul
4
If the starter motor is thought to be suspect, it
should be removed from the vehicle and taken
to an auto-electrician for testing. Most auto-
electricians will be able to supply and fit
brushes at a reasonable cost. However, check
on the cost of repairs before proceeding as it
may prove more economical to obtain a new
or exchange motor.
Starting and charging systems 5A•7
9.5b Starter motor rear support bracket
and fasteners (arrowed)9.5a Starter motor retaining bolts9.4 Disconnecting the wires from thestarter motor solenoid
5A
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5A•8 Starting and charging systems
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Notes
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5B
1595Ford Fiesta Remake
General
System type:1.0, 1.1 and 1.3 litre HCS engines with carburettor . . . . . . . . . . . . . . Distributorless ignition system (DIS) controlled by ignition module
1.1 and 1.3 litre HCS engines with CFi fuel injection . . . . . . . . . . . . . Electronic distributorless ignition system (E-DIS) with ignition module controlled by EEC IV engine management module
1.4 litre CVH engines with carburettor: Early models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . Distributor, with integral ignition amplifier module
Later models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . Distributorless ignition system (DIS) controlled by ignition module
1.6 litre CVH engines with carburettor . . . . . . . . . . . . . . . . . . . . . . . . Distributor, with integral ignition amplifier module
1.4 litre CVH engines with CFi fuel injection: Pre-September 1990 models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Distributor, with ignition module, controlled by EEC IV engine
management module
September 1990 models onward . . . . . . . . . . . . . . . . . . . . . . . . . . Electronic distributorless ignition system (E-DIS) with ignition module controlled by EEC IV engine management module
1.6 litre CVH engines with EFi fuel injection, and all PTE and Zetec
engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Electronic distributorless ignition system (E-DIS) with ignition module controlled by EEC IV engine management module
Firing order: HCS engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . 1-2-4-3
All other engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . 1-3-4-2
Location of No 1 cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
Crankshaft pulley end
Ignition coil
All engines with distributor ignition systems:
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . 30.0 kilovolts (minimum)
Primary resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . 0.72 to 0.88 ohms
Secondary resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. 4500 to 7000 ohms
All engines with distributorless ignition systems: Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . 37.0 kilovolts (minimum)
Primary resistance (measured at coil tower) . . . . . . . . . . . . . . . . . . . . 0.5 to 1.0 ohm
Distributor
Make:
1.4 and 1.6 litre carburettor models . . . . . . . . . . . . . . . . . . . . . . . . . . Lucas
1.4 litre CFi fuel injection models (pre-September 1990) . . . . . . . . . . Bosch
Direction of rotor arm rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anti-clockwise (viewed from cap)
Automatic advance method: 1.4 and 1.6 litre carburettor models . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical and vacuum
1.4 litre CFi fuel injection models (pre-September 1990) . . . . . . . . . . Totally controlled by EEC IV engine management module
Heat sink compound for ignition amplifier module (Lucas distributor) . . Ford part number 81 SF-12103-AA
Chapter 5 Part B:
Ignition system
Crankshaft position sensor - removal and refitting . . . . . . . . . . . . . . 6
Distributor cap and rotor arm - removal and refitting . . . . . . . . . . . . 7
Distributor vacuum diaphragm unit - renewal . . . . . . . . . . . . . . . . . . 9
Distributor - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
General information and precautions . . . . . . . . . . . . . . . . . . . . . . . . 1
Ignition coil - checking, removal and refitting . . . . . . . . . . . . . . . . . . 3 Ignition module - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . 5
Ignition system - testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ignition timing - checking and adjustment . . . . . . . . . . . . . . . . . . . . 10
Ignition amplifier module (distributor ignition systems) -
removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Spark plug renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .See Chapter 1
5B•1
Specifications Contents
Easy, suitable for
novice with little
experience Fairly easy,
suitable
for beginner with
some experience Fairly difficult,
suitable for competent
DIY mechanic
Difficult,
suitable for
experienced DIY
mechanic Very difficult,
suitable for expert DIY
or professional
Degrees of difficulty
54321
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Ignition timing
1.4 and 1.6 litre carburettor models with distributor:For use with 4-star leaded petrol (97 RON) . . . . . . . . . . . . . . . . . . . . 12°BTDC at idle speed (vacuum pipe disconnected and plugged)
For use with unleaded petrol (95 or 98 RON) . . . . . . . . . . . . . . . . . . . 8° BTDC at idle speed (vacuum pipe disconnected and plugged)
1.4 litre CFi fuel injection models with distributor (pre-Sept 1990) . . . . 10°BTDC at idle speed (set using STAR test equipment - refer to text)
All other models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . Totally controlled by ignition module or EEC IV engine management module
Spark plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . See Chapter 1 Specifications
Torque wrench settingsNmlbf ft
Crankshaft position sensor (all engines except Zetec) . . . . . . . . . . . . . . 3 to 4 2 to 3
Crankshaft position sensor to bracket (Zetec engines) . . . . . . . . . . . . . 7 to 9 5 to 7
Crankshaft position sensor bracket to engine (Zetec engines) . . . . . . . 18 to 23 13 to 17
DIS/E-DIS ignition coil to bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 to 7 4 to 5
DIS/E-DIS ignition coil bracket to engine (all engines except Zetec) . . . 9 to 12 7 to 9
DIS/E-DIS ignition coil bracket to engine (Zetec engines) . . . . . . . . . . . 18 to 23 13 to 17
5B•2 Ignition system
1595Ford Fiesta Remake
1 General information and
precautions
General information
The ignition system is responsible for
igniting the air/fuel mixture in each cylinder, at
the correct moment in relation to engine
speed and load, as the electrical spark
generated jumps the spark plug gap. The ignition system is based on feeding low
tension (LT) voltage from the battery to the
ignition coil where it is converted to high
tension (HT) voltage. The high tension voltage
is powerful enough to jump the spark plug
gap in the cylinders many times a second
under high compression pressures, providing
that the system is in good condition. A number of different ignition systems have
been fitted to Fiesta models depending on the
year of manufacture, type of fuel system fitted
and the emission level that the vehicle has
been designed to meet. Broadly speaking the
systems can be sub-divided into two
categories - distributor ignition systems and
distributorless ignition systems. One version of the distributor ignition
system is fitted to all CVH engines with
carburettors. A second (more sophisticated)
version is fitted to pre-September 1990 CVH
engines with CFi fuel injection. Distributorless ignition systems are fitted to
all HCS, PTE and Zetec engines, and to all
CVH engines with fuel injection except pre-
September 1990 CFi versions.
Distributor ignition systems (CVH
engines with carburettor)
The ignition system is divided into two
circuits; low tension (primary) and high
tension (secondary). The low tension circuit
consists of the battery, ignition switch, coil
primary windings, ignition amplifier module
and the signal generating system inside the distributor. The signal generating system
comprises the trigger coil, trigger wheel,
stator, permanent magnet and trigger coil to
ignition amplifier module connector. The high
tension circuit consists of the coil secondary
windings, the HT lead from the coil to the
distributor cap, the distributor cap, the rotor
arm, the HT leads from the distributor cap to
the spark plugs and the spark plugs
themselves.
When the system is in operation, low
tension voltage is changed in the coil into high
tension voltage by the action of the electronic
amplifier module in conjunction with the signal
generating system. Any change in the
magnetic field force (flux), created by the
movement of the trigger wheel relative to the
magnet, induces a voltage in the trigger coil.
This voltage is passed to the ignition amplifier
module which switches off the ignition coil
primary circuit. 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. The distributor is driven by an offset drive
dog locating to a correspondingly offset slot
in the end of the camshaft.
The ignition advance is a function of the
distributor and is controlled both mechanically
and by a vacuum operated system. The
mechanical governor mechanism consists of
two weights which move out from the
distributor shaft as the engine speed rises due
to centrifugal force. As they move outwards,
they rotate the trigger wheel relative to the
distributor shaft and so advance the spark.
The weights are held in position by two light
springs and it is the tension of the springs
which is largely responsible for correct spark
advancement. The vacuum control consists of a
diaphragm, one side of which is connected
via a small bore hose to the carburettor or
throttle housing, and the other side to the
distributor. Depression in the inlet manifold
and/or carburettor, which varies with engine
speed and throttle position, causes the
diaphragm to move, so moving the stator and
advancing or retarding the spark. A fine
degree of control is achieved by a spring in
the diaphragm assembly. Additionally, one or more vacuum valve
may be incorporated in the vacuum line
between the inlet manifold or carburettor and
the distributor. The function of these is to
control the vacuum felt at the distributor and
to prevent fuel entering along the vacuum line
(as applicable).
Distributor ignition systems (pre-
September 1990 CVH engines with
CFi fuel injection)
The ignition system is divided into two
circuits; low tension (primary) and high
tension (secondary). The low tension circuit
consists of the battery, ignition switch, ignition
module, ballast resistor, coil primary windings
and “Hall effect” distributor. The high tension
circuit consists of the coil secondary
windings, coil-to-distributor cap HT lead,
distributor cap, rotor arm, spark plug HT leads
and spark plugs. The system is under the
overall control of the EEC IV engine
management module which also controls the
fuel injection and emission control equipment. When the system is in operation the
distributor supplies the EEC IV module with a
crankshaft position reference signal to enable
an initial ignition timing setting to be
established. This signal is generated by
means of a trigger vane attached to the
distributor shaft and which rotates in the gap
between a permanent magnet and a sensor.
The trigger vane has four cut-outs, one for
each cylinder. When one of the trigger vane
cut-outs is in line with the sensor, magnetic
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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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