1989 FORD FIESTA fuel pump

4D
1595Ford Fiesta Remake
General
System type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . Sequential Electronic Fuel injection (SEFi)
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . 1.4 litre PTE engines and 1.6 and 1.8 litre Zetec engines
Fuel grade
Fuel octane requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. 95 RON unleaded
Fuel pressure
Regulated fuel pressure:*Pressure regulator vacuum hose disconnected . . . . . . . . . . . . . . . . . 2.7 ± 0.2 bars
With engine running and pressure regulator vacuum hose connected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . 2.1 ± 0.2 bars
Hold pressure - engine stopped after five minutes* . . . . . . . . . . . . . . . . 1.8 bars minimum
*The figures quoted are specific to Zetec engines. No values are quoted \
by the manufacturer for PTE engines, however they are likely to be similar.
Torque wrench settingsNm lbf ft
PTE engines
Inlet air duct to cylinder head cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7
Inlet manifold to cylinder head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 13
Inlet manifold upper to lower sections . . . . . . . . . . . . . . . . . . . . . . . . . . 18 13
Inlet air temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 11
Fuel rail-to-lower inlet manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 17
Camshaft position sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
6 4
Oxygen sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . 60 44
Zetec engines
Throttle housing-to-inlet manifold screws . . . . . . . . . . . . . . . . . . . . . . . 9 7
Inlet manifold to cylinder head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 13
Idle speed control valve bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4
Inlet air temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 11
Fuel pressure regulator bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4
Fuel injector bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . 6 4
Fuel rail-to-inlet manifold bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7
Camshaft position sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
8 6
Oxygen sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . 60 44
Chapter 4 Part D: Fuel system -
sequential electronic fuel injection engines
Accelerator cable - removal, refitting and adjustment . . . . . . . . . . . 5
Accelerator pedal - removal and refitting . . . . . . . . . . . . . . . . . . . . . 6
Air cleaner assembly and air inlet components - removal and
refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . 4
Air cleaner element renewal . . . . . . . . . . . . . . . . . . . . . .See Chapter 1
Fuel cut-off switch - removal and refitting . . . . . . . . . . . . . . . . . . . . 12
Fuel filter renewal . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . .See Chapter 1
Fuel injection system - checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Fuel injection system components - removal and refitting . . . . . . . . 14
Fuel lines and fittings - general information . . . . . . . . . . . . . . . . . . . 3
Fuel pump/fuel gauge sender unit - removal and refitting . . . . . . . . 9 Fuel pump/fuel pressure - checking . . . . . . . . . . . . . . . . . . . . . . . . . 7
Fuel system - depressurisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Fuel tank - removal, inspection and refitting . . . . . . . . . . . . . . . . . . . 8
Fuel tank filler pipe - removal and refitting . . . . . . . . . . . . . . . . . . . . 11
Fuel tank ventilation tube - removal and refitting . . . . . . . . . . . . . . . 10
General fuel system checks . . . . . . . . . . . . . . . . . . . . . .See Chapter 1
General information and precautions . . . . . . . . . . . . . . . . . . . . . . . . 1
Inlet manifold - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . 15
Underbody fuel/brake line check . . . . . . . . . . . . . . . . . . .See\
Chapter 1
Underbonnet check for fluid leaks and hose condition . .See Chapter 1
4D•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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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 sequential
electronic fuel injection system.
The electric fuel pump supplies fuel under
pressure to the fuel rail, which distributes fuel
evenly to all injectors. A pressure regulator
controls the system pressure in relation to
inlet tract depression. From the fuel rail, fuel is
injected into the inlet ports, just above the
inlet valves, by four fuel injectors. The system
also includes features such as the flushing of
fresh (ie, cold) fuel around each injector on
start-up, thus improving hot starts. The amount of fuel supplied by the injectors
is precisely controlled by the EEC IV engine
management module. The module uses the
signals derived from the crankshaft position
sensor and the camshaft position sensor, to
trigger each injector separately in cylinder
firing order (sequential injection), with benefits
in terms of better fuel economy and lower
exhaust emissions. 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 which is then 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. The camshaft position sensor is located in
the cylinder head so that it registers with a
lobe on the camshaft. The camshaft position
sensor functions in the same way as the
crankshaft position sensor, producing a series
of pulses; this gives the EEC IV module a
reference point, to enable it to determine the
firing order, and operate the injectors in the
appropriate sequence. The mass air flow sensor is based on a “hot-
wire” system, sending the EEC IV module a constantly-varying (analogue) voltage signal
corresponding to the mass of air passing into
the engine. Since air mass varies with
temperature (cold air being denser than warm),
measuring air mass provides the module with
a very accurate means of determining the
correct amount of fuel required to achieve the
ideal air/fuel mixture ratio.
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
module with a signal corresponding to the
temperature of air passing into the engine.
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 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.
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.
The oxygen sensor in the exhaust system
provides the 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. The air inlet side of the system consists of
an air cleaner housing, the mass air flow
sensor, an inlet hose and duct, and a throttle
housing. The throttle valve inside the throttle housing
is controlled by the driver, through the
accelerator pedal. As the valve opens, the
amount of air that can pass through the
system increases. As the throttle valve opens further, the mass air flow sensor signal alters,
and the EEC IV module opens each injector
for a longer duration, to increase the amount
of fuel delivered to the inlet ports.
Both the idle speed and mixture are under
the control of the EEC IV module, and cannot
be adjusted. Not only can they not be
adjusted, they cannot even be checked,
except with the use of special Ford diagnostic
equipment.
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
Refer to Part B, Section 2.
3 Fuel lines and fittings -
general information
Refer to Part B, Section 3.
4D•2 Fuel system - sequential electronic fuel injection engines
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7 Fuel pump/fuel pressure-
checking
3
Note: Refer to the warning note in Section 1
before proceeding.
Fuel pump operation check
1 Switch on the ignition, and listen for the fuel
pump (the sound of an electric motor running,
audible from beneath the rear seats).
Assuming there is sufficient fuel in the tank,
the pump should start and run for
approximately one or two seconds, then stop,
each time the ignition is switched on. Note:If
the pump runs continuously all the time the
ignition is switched on, the electronic control
system is running in the backup (or “limp-
home”) mode referred to by Ford as “Limited
Operation Strategy” (LOS). This almost
certainly indicates a fault in the EEC IV module
itself, and the vehicle should therefore be
taken to a Ford dealer for a full test of the
complete system, using the correct diagnostic
equipment; do not waste time or risk
damaging the components by trying to test
the system without such facilities.
2 Listen for fuel return noises from the fuel
pressure regulator. It should be possible to
feel the fuel pulsing in the regulator and in the
feed hose from the fuel filter.
3 If the pump does not run at all, check the
fuse, relay and wiring (see Chapter 12). Check
also that the fuel cut-off switch has not been
activated and if so, reset it.
Fuel pressure check
4 A fuel pressure gauge will be required for
this check and should be connected in the
fuel line between the fuel filter and the fuel rail,
in accordance with the gauge maker’s
instructions. On Zetec engines, a pressure
gauge equipped with an adapter to suit the
Schrader-type valve on the fuel rail pressure
test/release fitting (identifiable by its blue
plastic cap, and located on the union of the
fuel feed line and the fuel rail) will be required.
If the Ford special tool 29-033 is available, the
tool can be attached to the valve, and a
conventional-type pressure gauge attached to
the tool.
5 If using the service tool, ensure that its tap
is turned fully anti-clockwise, then attach it to
the valve. Connect the pressure gauge to the
service tool. If using a fuel pressure gauge
with its own adapter, connect it in accordance
with its maker’s instructions.
6 Start the engine and allow it to idle. Note
the gauge reading as soon as the pressure
stabilises, and compare it with the regulated
fuel pressure figures listed in the
Specifications .
a) If the pressure is high, check for a
restricted fuel return line. If the line is
clear, renew the fuel pressure regulator.
b) If the pressure is low, pinch the fuel return
line. If the pressure now goes up, renew the fuel pressure regulator. If the pressure
does not increase, check the fuel feed
line, the fuel pump and the fuel filter.
7 Detach the vacuum hose from the fuel
pressure regulator; the pressure shown on the
gauge should increase. Note the increase in
pressure, and compare it with that listed in the
Specifications . If the pressure increase is not
as specified, check the vacuum hose and
pressure regulator.
8 Reconnect the regulator vacuum hose, and
switch off the engine. Verify that the hold
pressure stays at the specified level for five
minutes after the engine is turned off.
9 Carefully disconnect the fuel pressure
gauge, depressurising the system first as
described in Section 2. Be sure to cover the
fitting with a rag before slackening it. Mop up
any spilt petrol.
10 Run the engine, and check that there are
no fuel leaks.
8 Fuel tank - removal,
inspection and refitting
3
Proceed as described in Part A, Section 8,
but before disconnecting the battery, relieve
the residual pressure in the fuel system (see
Section 2), and equalise tank pressure by
removing the fuel filler cap.
9 Fuel pump/fuel gauge sender unit - removal and
refitting
3
Refer to Part B, Section 9.
10 Fuel tank ventilation tube -
removal and refitting
3
Refer to Part A, Section 10, but note that
the ventilation tube connects to the combined
roll-over/anti-trickle-fill valve assembly but,
instead of venting to atmosphere, a further
tube runs the length of the vehicle to the
evaporative emission control system carbon canister in the front right-hand corner of the
engine compartment.
Further information on the evaporative
emission control system is contained in Part E
of this Chapter.
11 Fuel tank filler pipe -
removal and refitting
3
Refer to Part A, Section 11.
12 Fuel cut-off switch -
removal and refitting
1
Refer to Part B, Section 12.
13 Fuel injection system -
checking
3
Refer to Part B, Section 13
14 Fuel injection system components - removal and
refitting
3
Note: Refer to the warning note in Section 1
before proceeding.
Throttle housing
1 Disconnect the battery negative (earth) lead
(refer to Chapter 5A, Section 1).
2 Remove the air inlet components as
described in Section 4.
3 Disconnect the accelerator cable from the
throttle linkage (see Section 5).
4 Disconnect the throttle position sensor
multi-plug.
5 Unscrew the retaining bolts, and detach the
accelerator cable support bracket at the
throttle housing (see illustration) .
6 Unscrew the throttle housing-to-manifold
retaining bolts (see illustration) , and unbolt
the throttle housing support bracket bolts
(where fitted). Remove the throttle housing
4D•4 Fuel system - sequential electronic fuel injection engines
14.6 Throttle housing retaining bolts
(arrowed)14.5 Unscrew the retaining bolts (arrowed),and detach the accelerator cable support
bracket
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and gasket. Discard the gasket - this must be
renewed whenever it is disturbed.
7Refit in the reverse order of removal. Check
that the mating faces are clean, and fit a new
gasket. Adjust the accelerator cable as
described in Section 5 on completion.
Fuel rail and injectors
Note: The following procedure is applicable
mainly to Zetec engines; specific information
for the PTE engine was not available at the
time of writing. However, apart from minor
differences in component attachments, both
engine types are very similar in this area.
8 Relieve the residual pressure in the fuel
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.
9 Disconnect the battery negative (earth) lead
- see Chapter 5A, Section 1.
10 Remove the air inlet components as
described in Section 4.
11 Disconnect the accelerator cable from the
throttle linkage (see Section 5).
12 Disconnect the throttle position sensor
multi-plug.
13 Remove the throttle housing mounting
screws, then detach the throttle housing and gasket from the inlet manifold. Discard the
gasket - this must be renewed whenever it is
disturbed.
14
Detach the crankcase breather hose from
the cylinder head cover, and the fuel pressure
regulator vacuum hose from the inlet
manifold.
15 Releasing the wire clips, unplug the four
fuel injector multi-plugs and the inlet air
temperature sensor multi-plug.
16 Refer to Section 3 and disconnect the fuel
feed and return lines at the quick-release
couplings, then unclip the fuel hoses from the
inlet manifold; use rag to soak up any spilt
fuel. Note: Do not disturb the threaded
couplings at the fuel rail unions unless
absolutely necessary; these are sealed at the
factory. The quick-release couplings will
suffice for all normal service operations.
17 Unscrew the three bolts securing the fuel
rail (see illustration) . Withdraw the rail,
carefully prising it out of the inlet manifold,
and draining any remaining fuel into a suitable
clean container. Note the seals between the
rail noses and the manifold; these must be
renewed whenever the rail is removed (see
illustration) .
18 Clamping the rail carefully in a vice fitted
with soft jaws, unscrew the two bolts securing
each injector, and withdraw the injectors (see
illustration) . Place each in a clean, clearly-
labelled storage container.
19 If the injector(s) are being renewed,
discard the old injector, the nose seal and the
O- rings. If only the injector O-rings are being renewed, and it is intended that the same
injectors will be re-used, remove the old nose
seal and O-rings, and discard them.
20
Refitting is the reverse of the removal
procedure, noting the following points:
a) Lubricate each nose seal and O-ring with clean engine oil on installation.
b) Locate each injector carefully in the fuel
rail recess, ensuring that the locating tab
on the injector head fits into the slot
provided in the rail. Tighten the bolts
securely.
c) Fit a new seal to each fuel rail nose, and
ensure that the seals are not displaced as
the rail is refitted (see illustration).
Ensure that the fuel rail is settled fully in
the manifold before tightening the bolts.
d) Ensure that the hoses and wiring are
routed correctly, and secured on
reconnection by any clips or ties
provided.
e) Adjust the accelerator cable as described
in Section 5.
f) On completion, switch the ignition on and off five times, to activate the fuel pump
and pressurise the system, without
cranking the engine. Check for signs of
fuel leaks around all disturbed unions and
joints before attempting to start the
engine.
Fuel pressure regulator
21 Relieve the residual pressure in the fuel
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.
22 Disconnect the battery negative (earth)
lead - see Chapter 5A, Section 1.
23 Disconnect the vacuum hose from the
regulator.
24 Unscrew the two regulator retaining bolts
(see illustration) then use a wad of clean rag
to soak up any spilt fuel, and withdraw the
regulator.
Fuel system - sequential electronic fuel injection engines 4D•5
14.18 Removing an injector from the fuel rail. Note the O-ring seals (arrowed)14.17b Note nose seals (arrowed) between rail and intermediate flange14.17a Unscrewing fuel rail mounting bolts (arrowed)
14.24 Fuel pressure regulator vacuumhose (A) and retaining bolts (B)14.20 Fit new nose seals (arrowed) before refitting the fuel rail
4D
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25Refitting is the reverse of the removal
procedure, noting the following points: a) Renew the regulator sealing O-ring
whenever the regulator is disturbed.
Lubricate the new O-ring with clean
engine oil on installation.
b) Locate the regulator carefully in the fuel
rail recess, and tighten the bolts securely.
c) On completion, switch the ignition on and off five times, to activate the fuel pump
and pressurise the system, without
cranking the engine. Check for signs of
fuel leaks around all disturbed unions and
joints before attempting to start the
engine.
Idle speed control valve
26 Disconnect the battery negative (earth)
lead (refer to Chapter 5A, Section 1).
27 Disconnect the valve’s wiring multi-plug
(see illustration) .
28 Unscrew the three retaining bolts, and
withdraw the valve from the inlet manifold.
29 Refitting is the reverse of the removal
procedure, noting the following points: a) Clean the mating surfaces carefully, and
always fit a new gasket whenever the
valve is disturbed.
b) Once the wiring and battery are
reconnected, start the engine and allow it
to idle. When it has reached normal
operating temperature, check that the idle
speed is stable, and that no induction (air)
leaks are evident. Switch on all electrical loads (headlights, heated rear window,
etc), and check that the idle speed is still
satisfactory.
Mass air flow sensor
30
Releasing its wire clip, unplug the
electrical connector from the sensor (see
illustration 4.2a) .
31 Release the two clips and detach the
sensor from the air cleaner cover (see
illustrations 4.2b and 4.2c) .
32 Slacken the clamp securing the sensor to
the air inlet hose, and withdraw the sensor.
33 Refitting is the reverse of the removal
procedure. Ensure that the sensor and air
cleaner cover are seated correctly and
securely fastened, so that there are no air
leaks.
EEC IV engine management
module
Note: The module is fragile. Take care not to
drop it, or subject it to any other kind of
impact. Do not subject it to extremes of
temperature, or allow it to get wet. Refer to
Part B, Section 14 for illustrations of the
following procedure.
34 Disconnect the battery negative (earth)
lead (refer to Chapter 5A, Section 1).
35 Remove the cooling system expansion
tank as described in Chapter 3, for access to
the module multi-plug.
36 Unscrew and remove the two nuts
securing the module cover in the engine
compartment, then carefully draw the cover
away from its location. Unscrew the module
multi-plug retaining bolt and disconnect
the multi-plug from the module.
37 The aid of an assistant will be required at
this stage, to support and withdraw the
module from inside the passenger
compartment as its mounting bracket retaining
tags are compressed and released from the
engine compartment. Do not allow the module
to drop into the passenger compartment as
irreparable damage is likely to result. The
module may be separated from its mounting
bracket by undoing the securing bolts.
38 Refitting is a reversal of the removal
procedure, ensuring that the module
mounting bracket retaining tags are felt to snap into position. Refit the expansion tank as
described in Chapter 3 on completion.
Crankshaft position sensor
39
Refer to Chapter 5B.
Camshaft position sensor
40Where applicable, release the fuel feed
and return hoses from their clip. On PTE
engines, detach the adjacent engine breather
hose.
41 Releasing its wire clip, unplug the
sensor’s wiring multi-plug. Remove the
retaining screw, and withdraw the sensor from
the cylinder head; be prepared for slight oil
loss (see illustration) .
42 Refitting is the reverse of the removal
procedure, noting the following points: a) Apply petroleum jelly or clean engine oil
to the sensor’s sealing O-ring.
b) Locate the sensor fully in the cylinder
head, and wipe off any surplus lubricant
before securing it.
c) Tighten the screw to the specified torque wrench setting.
Coolant temperature sensor
43 Refer to Chapter 3.
Inlet air temperature sensor
44Releasing its clip, unplug the sensor’s
electrical connector, then unscrew the sensor
from the inlet manifold (see illustration).
45 Refitting is the reverse of the removal
procedure.
Throttle position sensor
46 Releasing its wire clip, unplug the
sensor’s wiring multi-plug. Remove the
retaining screws, and withdraw the unit from
the throttle housing (see illustration). Do not
force the sensor’s centre to rotate past its
normal operating sweep; the unit will be
seriously damaged.
47 Refitting is the reverse of the removal
procedure, noting the following points: a) Ensure that the sensor is correctly orientated, by locating its centre on the D-
shaped throttle shaft (throttle closed), and
aligning the sensor body so that the bolts
pass easily into the throttle housing.
4D•6 Fuel system - sequential electronic fuel injection engines
14.46 Throttle position sensor mounting screws (arrowed)14.44 Removing the intake air temperaturesensor from the rear of the inlet manifold
(Zetec engine shown)14.41 Disconnecting the camshaft positionsensor wiring multi-plug (Zetec engine
shown)
14.27 Idle speed control valve wiringmulti-plug (A) and visible mounting bolts (B)
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12
1595Ford Fiesta Remake
Fuses - pre-1992 models
Main fuse board:
No Rating (amps) Circuit(s) protected
1 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . Electronic engine control system
2 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Interior light, cigarette lighter, clock and radio memory
3 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Central locking system
4 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Heated rear window element
5 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Dim-dip lighting
6 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Left-hand side lights and rear fog light
7 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Right-hand side lights
8 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Left-hand dipped beam
9 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Right-hand dipped beam
10 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Left-hand main beam and right-hand auxiliary driving light
11 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Right-hand main beam and left-hand auxiliary driving light
12 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Heater fan motor and reversing light
13 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Radiator cooling fan motor
14 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Front foglights (XR2i only)
15 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Horn
16 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Wiper motor and windscreen/tailgate washer pump
17 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Brake stop lights, instrument illumination and instrument warning
18 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Electrically operated windows
19 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Electric fuel pump
20 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Oxygen sensor (vehicles with catalytic converter)
21 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Left-hand direction indicators
22 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Right-hand direction indicators
Chapter 12
Body electrical systems
Air bag (driver’s side) - removal and refitting . . . . . . . . . . . . . . . . . . 28
Air bag (passenger’s side) - removal and refitting . . . . . . . . \
. . . . . . . 29
Air bag clock spring - removal and refitting . . . . . . . . . . . . . . . . . . . 31
Air bag control module - removal and refitting . . . . . . . . . . . . . . . . . 30
Anti-theft systems - general information . . . . . . . . . . . . . . . . . . . . . . 27
Battery, bulbs and fuses . . . . . . . . . . . . . . . . . . . .See
“Weekly checks”
Bulbs (exterior lights) - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Bulbs (interior lights) - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Cigarette lighter - removal and refitting . . . . . . . . . . . . . . . . . . . . . . 12
Clock - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Electric window regulator motor - removal and refitting . . . . . . . . . . 20
Electrical fault-finding - general information . . . . . . . . . . . . . . . . . . . 2
Exterior light units - removal and refitting . . . . . . . . . . . . . . . . . . . . . 7
Fuses and relays - general information . . . . . . . . . . . . . . . . . . . . . . . 3
General information and precautions . . . . . . . . . . . . . . . . . . . . . . . . 1
Headlight and auxiliary light beam alignment - checking and
adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . 8
Horn - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Instrument panel - removal and refitting . . . . . . . . . . . . . . . . . . . . . . 9
Instrument panel components - removal and refitting . . . . . . . . . . . 10
“Lights-on” warning module - removal and refitting . . . . . . . . . . . . . 26
Radio aerial - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Radio/cassette player - removal and refitting . . . . . . . . . . . . . . . . . . 22
Screen washer fluid level check . . . . . . . . . . . . . .See
“Weekly checks”
Speaker balance control joystick - removal and refitting . . . . . . . . . 24
Speakers - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Speedometer cable - removal and refitting . . . . . . . . . . . . . . . . . . . . 11
Switches - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Tailgate remote release motor - removal and refitting . . . . . . . . . . . 21
Tailgate wiper motor assembly - removal and refitting . . . . . . . . . . . 18
Windscreen wiper motor and linkage - removal and refitting . . . . . . 16
Windscreen wiper pivot shaft - removal and refitting . . . . . . . . . . . . 17
Windscreen/tailgate washer system components - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . 19
Wiper arms - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Wiper blade check . . . . . . . . . . . . . . . . . . . . . . . .See “Weekly checks”
12•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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Additional fuses behind main fuse board:
NoRating (amps) Circuit(s) protected
23 - . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . Unused
24/25 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Rear fog lights
26 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Tailgate remote release
27/28 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Heated windscreen
Fuses - 1992 models onward
Main fuse board:
Fuses 1 to 22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . Unchanged from pre-1992 models
Additional fuses behind main fuse board:
No Rating (amps) Circuit(s) protected
23* - . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Unused
23** 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Rear fog lights
24* - . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Unused 24** 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Rear fog lights
25 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Tailgate remote release, anti-theft warning system
26 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Heated windscreen
27 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Heated windscreen
28* 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Full-length sunroof
28** 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Automatic transmission starter inhibitor
29 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . Air bag
* Pre-1994 models
** 1994 models onward
Relays (pre-1992 models)
Note: Relay locations and circuits controlled are liable to change from year t\
o year. Consult a Ford dealer, for specific information.
No Circuit(s) controlled
I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Heated rear window
II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Windscreen wiper delay
III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . CFi (fuel injection) delay relay
IV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Not used on UK models
V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Ignition switch
VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Automatic transmission starter inhibitor/electric fuel pump (bridge fitted to carburettor engines without automatic transmission)
VII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Headlight main beam
VIII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Dim-dip lighting
IX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Not used on UK models
X . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Not used on UK models
XI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Heated windscreen
XII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Anti-lock braking system
A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Idle speed control (automatic transmission) two-tone horn (where fitt\
ed)
B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Not used on UK models
C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Front foglights (XR2i)
D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Headlight dipped beam
E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Dim-dip lighting
Relays (1992 models onward)
Note: Relay locations and circuits controlled are liable to change from year t\
o year. Consult a Ford dealer, for specific information.
No Circuit(s) controlled
I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Heated rear window
II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Windscreen wiper delay
III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . CFi delay relay or EFi supply relay (fuel injection)
IV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Not used on UK models
V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Ignition switch
VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Automatic transmission starter inhibitor, anti-theft warning system
VII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Headlight main beam
VIII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Anti-lock braking system and/or dim-dip lighting
IX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Not used on UK models
X . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Not used on UK models
XI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Heated windscreen
XII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Anti-lock braking system
A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Idle speed control (automatic transmission) or two-tone horn (where f\
itted)
B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Fuel pump
C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Front foglights (XR2i, RS Turbo and RS 1800)
D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Headlight dipped beam
E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Dim-dip lighting
F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . . . . . . . . Not used on UK models
12•2 Body electrical systems
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1595 Ford Fiesta Remake
failure of components such as fuses or spark
plugs may only be pointers to some
underlying fault.
The pages which follow provide an easy
reference guide to the more common
problems which may occur during the
operation of the vehicle. These problems and
their possible causes are grouped under
headings denoting various components or
systems, such as Engine, Cooling system,
etc. The Chapter and/or Section which deals
with the problem is also shown in brackets.
Whatever the fault, certain basic principles
apply. These are as follows:
Verify the fault . This is simply a matter of
being sure that you know what the symptoms are before starting work. This is particularly
important if you are investigating a fault for
someone else, who may not have described it
very accurately.
Don’t overlook the obvious . For example, if
the vehicle won’t start, is there petrol in the
tank? (Don’t take anyone else’s word on this
particular point, and don’t trust the fuel gauge
either!) If an electrical fault is indicated, look
for loose or broken wires before digging out
the test gear. Cure the disease, not the symptom .
Substituting a flat battery with a fully-charged
one will get you off the hard shoulder, but if
the underlying cause is not attended to, the
new battery will go the same way. Similarly, changing oil-fouled spark plugs for a new set
will get you moving again, but remember that
the reason for the fouling (if it wasn’t simply an
incorrect grade of plug) will have to be
established and corrected.
Don’t take anything for granted . Particularly,
don’t forget that a “new” component may
itself be defective (especially if it’s been
rattling around in the boot for months), and
don’t leave components out of a fault
diagnosis sequence just because they are
new or recently fitted. When you do finally
diagnose a difficult fault, you’ll probably
realise that all the evidence was there from
the start.
Fault findingREF•15
REF
Engine
Engine fails to rotate when attempting to start
m
m Battery terminal connections loose or corroded (Chapter 5A).
m
m Battery discharged or faulty (Chapter 5A).
m
m Broken, loose or disconnected wiring in the starting circuit
(Chapter 5A).
m m Defective starter solenoid or switch (Chapter 5A).
m
m Defective starter motor (Chapter 5A).
m
m Flywheel ring gear or starter pinion teeth loose or broken
(Chapters 2A, 2B, 2C or 5A).
m m Engine earth strap broken or disconnected (Chapter 5A).
m
m Automatic transmission not in Park/Neutral position, or starter
inhibitor switch faulty (Chapter 7B).
Engine rotates, but will not start
m mFuel tank empty.
m
m Battery discharged (engine rotates slowly) (Chapter 5A).
m
m Battery terminal connections loose or corroded (Chapter 5A).
m
m Ignition components damp or damaged (Chapters 1 and 5B).
m
m Broken, loose or disconnected wiring in the ignition circuit
(Chapters 1 and 5B).
m m Worn, faulty or incorrectly-gapped spark plugs (Chapter 1).
m
m Major mechanical failure (eg camshaft drive) (Chapters 2A, 2B
or 2C).
Engine difficult to start when cold
m mBattery discharged (Chapter 5A).
m
m Battery terminal connections loose or corroded (Chapter 5A).
m
m Worn, faulty or incorrectly-gapped spark plugs (Chapter 1).
m
m Other ignition system fault (Chapters 1 and 5B).
m
m Engine management system fault (Chapters 1, 4A, 4B, 4C, 4D, 4E
or 5B).
m m Low cylinder compressions (Chapters 2A, 2B or 2C).
Engine difficult to start when hot
m
mAir filter element dirty or clogged (Chapter 1).
m
m Engine management system fault (Chapters 1, 4A, 4B, 4C, 4D, 4E
or 5B).
m m Low cylinder compressions (Chapters 2A, 2B or 2C).
m
m Faulty hydraulic tappet(s) (Chapters 2B or 2C).
Starter motor noisy or excessively-rough in
engagement
m mFlywheel ring gear or starter pinion teeth loose or broken
(Chapters 2A, 2B, 2C or 5A).
m m Starter motor mounting bolts loose or missing (Chapter 5A).
m
m Starter motor internal components worn or damaged (Chapter 5A).
Engine starts but stops immediately
m
mLoose or faulty electrical connections in the ignition circuit
(Chapters 1 and 5B).
m m Engine management system fault (Chapters 1, 4A, 4B, 4C, 4D, 4E
or 5B).
m m Vacuum leak at the inlet manifold (Chapters 1, 4A, 4B, 4C, 4D or 4E).
Engine idles erratically
m
mEngine management system fault (Chapters 1, 4A, 4B, 4C, 4D, 4E
or 5B).
m m Air filter element clogged (Chapter 1).
m
m Vacuum leak at the inlet manifold or associated hoses (Chap-
ters 1, 4A, 4B, 4C, 4D or 4E).
m m Worn, faulty or incorrectly-gapped spark plugs (Chapter 1).
m
m Incorrect valve clearances (Chapter 2A).
m
m Faulty hydraulic tappet(s) (Chapters 2B or 2C).
m
m Uneven or low cylinder compressions (Chapters 2A, 2B or 2C).
m
m Camshaft lobes worn (Chapters 2A, 2B or 2C).
m
m Timing chain and sprockets worn (Chapter 2A).
m
m Timing belt incorrectly-tensioned (Chapters 2B or 2C).
Engine misfires at idle speed
m
mWorn, faulty or incorrectly-gapped spark plugs (Chapter 1).
m
m Faulty spark plug HT leads (Chapter 1).
m
m Engine management system fault (Chapters 1, 4A, 4B, 4C, 4D, 4E
or 5B).
m m Vacuum leak at the inlet manifold or associated hoses (Chap-
ters 1, 4A, 4B, 4C, 4D or 4E).
m m Incorrect valve clearances (Chapter 2A).
m
m Faulty hydraulic tappet(s) (Chapters 2B or 2C).
m
m Uneven or low cylinder compressions (Chapters 2A, 2B and 2C).
m
m Disconnected, leaking or perished crankcase ventilation hoses
(Chapters 1 and 4E).
Engine misfires throughout the driving speed range
m mFuel filter choked (Chapter 1).
m
m Fuel pump faulty or delivery pressure low (Chapters 4A, 4B, 4C or 4D).\
m
m Fuel tank vent blocked or fuel pipes restricted (Chapters 4A, 4B,
4C, 4D or 4E).
m m Vacuum leak at the inlet manifold or associated hoses (Chap-
ters 1, 4A, 4B, 4C, 4D or 4E).
m m Worn, faulty or incorrectly-gapped spark plugs (Chapter 1).
m
m Faulty spark plug HT leads (Chapter 1).
m
m Faulty ignition coil (Chapter 5B).
m
m Engine management system fault (Chapters 1, 4A, 4B, 4C, 4D, 4E
or 5B).
m m Uneven or low cylinder compressions (Chapters 2A, 2B or 2C).
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