1985 FORD GRANADA ECU

The components of the alarm system are a
control module, tripping switches, activating
switches, an alarm horn and a signal buzzer.
The control module is located behind the
facia. It determines whether the alarm is set or
not, monitors the tripping switches and the
ignition circuit, and limits the duration of the
alarm to 30 seconds. This last item is a legal
requirement. The control module also
operates the signal buzzer to tell the driver
that the alarm is set, and controls the activator
delay.
The tripping switches on the doors and
tailgate are the same as those used for “open
door” warnings in the AWS. The bonnet switch
is peculiar to the alarm system.
The activating switches are fitted to the
front door lock barrels, where they are
activated by a lug on the end of the barrel.
They only make contact momentarily as the
lock is operated.
The alarm horn is mounted next to the
battery. Both the horn and its leads are
claimed to be inaccessible without opening
the bonnet. The signal buzzer is also mounted
under the bonnet.
No service, repair or component renewal
procedures have been published for the alarmsystem components on earlier models. Any
problems arising which cannot be dealt with
by component substitution should therefore
be referred to a Ford dealer.
Ultrasonic sensor
1Disconnect the battery negative terminal.
2Prise out the retaining screw trim cap from
the centre of the sensor then slacken and
remove the retaining screws and lower the
sensor away from the headlining,
disconnecting the wiring plug as it becomes
accessible.
3Refitting is the reverse of the removal
procedure.
Anti-theft alarm module (models
from April 1992)
4On these models the alarm module is located
behind the righthand lower facia panel.
5To remove the module, remove the right-
hand facia undercover and lower facia panel.
6The anti-theft alarm module is the left-hand
of the two modules situated directly above the
control pedals. Release the module retaining
clips then disconnect the wiring connector and
remove the module from the vehicle (see
illustration).7Refitting is the reverse of the removal
procedure.
Alarm signal buzzer (models from
April 1992)
8The alarm signal buzzer is situated under
the bonnet where it is mounted on the upper
right-hand side of the engine compartment
bulkhead.
9To remove the buzzer, open the bonnet then
unclip the buzzer from the bulkhead and
disconnect the wiring connector (see
illustration).
10Refitting is the reverse of the removal
procedure.
Alarm system horn (models from
April 1992)
11On these models the alarm system horn is
mounted in the front right-hand corner of the
engine compartment (see illustration).
12To remove the horn, undo the two horn
mounting bracket retaining screws then
disconnect the wiring connectors and remove
the horn from the engine compartment.
13Refitting is the reverse of the removal
procedure.
Body electrical system 13•23
13
36.6 Removing the anti-theft alarm control
module36.9 Removing the alarm system warning
buzzer36.11 Alarm horn location
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WD•0
Explanatory notes for wiring diagrams
Each wiring diagram covers a particular system of the vehicle; as indicated in each caption. When a number is shown on a diagram inside a box
with an arrow symbol, this indicates that the circuit concerned starts, or is continued, in the diagram having that number.
Space limitations mean that not all diagrams have been included. Therefore the diagram numbers are not consecutive, neither is it always
possible to follow a particular circuit to completion. Some diagrams are out of sequence; this is to ensure that the halves of the larger diagrams
appear on opposite pages.
The prefix C indicates a connector or multi-plug, S a soldered joint and G an earthing point (ground). The numbers appearing at the break in
each wire indicate the circuit number and wire colour.
Colour code
BLBlue
BRBrown
GEYellow
GRGrey
GNGreen
RSPink
RT Red
SWBlack
VIViolet
WSWhiteSubjectDiagram number
ABS21
Auxiliary warning system23
Central locking system14
Charge, start and run3
Charge, start and run3A
Engine management (1.8 litre)4
Engine management (2.0 litre carburettor)4A
Engine management (2.0 litre fuel-injection)5
Engine management (2.8 litre)5C
Exterior lighting7A
Heater blower11
Interior lighting10
Power 0perated windows15
Power distribution2
Power-operated sliding roof16
Radio/cassette player and associated circuits29
Signalling and warning systems9
Wipers and washers12
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The vehicle owner who does his or her own maintenance according
to the recommended service schedules should not have to use this
section of the manual very often. Modern component reliability is such
that, provided those items subject to wear or deterioration are
inspected or renewed at the specified intervals, sudden failure is
comparatively rare. Faults do not usually just happen as a result of
sudden failure, but develop over a period of time. Major mechanical
failures in particular are usually preceded by characteristic symptoms
over hundreds or even thousands of miles. Those components which
do occasionally fail without warning are often small and easily carried
in the vehicle.With any fault-finding, the first step is to decide where to begin
investigations. Sometimes this is obvious, but on other occasions, a
little detective work will be necessary. The owner who makes half a
dozen haphazard adjustments or replacements may be successful in
curing a fault (or its symptoms), but will be none the wiser if the fault
recurs, and ultimately may have spent more time and money than was
necessary. A calm and logical approach will be found to be more
satisfactory in the long run. Always take into account any warning
signs or abnormalities that may have been noticed in the period
preceding the fault - power loss, high or low gauge readings, unusual
smells, etc - and remember that failure of components such as fuses or
REF•5Fault Finding
Engine1
m mEngine fails to rotate when attempting to start
m mStarter motor turns engine slowly
m mEngine rotates, but will not start
m mEngine difficult to start when cold
m mEngine difficult to start when hot
m mStarter motor noisy or excessively-rough in engagement
m mEngine starts, but stops immediately
m mEngine idles erratically
m mEngine misfires at idle speed
m mEngine misfires throughout the driving speed range
m mEngine hesitates on acceleration
m mEngine stalls
m mEngine lacks power
m mEngine backfires
m mOil pressure warning light illuminated with engine running
m mEngine runs-on after switching off
m mEngine noises
Cooling system2
m
mOverheating
m mOvercooling
m mExternal coolant leakage
m mInternal coolant leakage
m mCorrosion
Fuel and exhaust systems3
m
mExcessive fuel consumption
m mFuel leakage and/or fuel odour
m mExcessive noise or fumes from exhaust system
Clutch4
m
mPedal travels to floor - no pressure or very little resistance
m mClutch fails to disengage (unable to select gears)
m mClutch slips (engine speed increases, with no increase in vehicle
speed)
m mJudder as clutch is engaged
m mNoise when depressing or releasing clutch pedal
Manual gearbox5
m
mNoisy in neutral with engine running
m mNoisy in one particular gear
m mDifficulty engaging gears
m mJumps out of gear
m mVibration
m mLubricant leaks
Automatic transmission6
m
mFluid leakage
m mTransmission fluid brown, or has burned smellm mGeneral gear selection problems
m mTransmission will not downshift (kickdown) with accelerator fully
depressed
m mEngine will not start in any gear, or starts in gears other than Park
or Neutral
m mTransmission slips, shifts roughly, is noisy, or has no drive in
forward or reverse gears
Propeller shaft7
m
mClicking or knocking noise on turns (at slow speed on full-lock)
m mVibration when accelerating or decelerating
Final drive and driveshafts8
m
mExcessive final drive noise
m mOil leakage from final drive
m mGrating, knocking or vibration from driveshafts
Braking system9
m
mVehicle pulls to one side under braking
m mNoise (grinding or high-pitched squeal) when brakes applied
m mExcessive brake pedal travel
m mBrake pedal feels spongy when depressed
m mExcessive brake pedal effort required to stop vehicle
m mJudder felt through brake pedal or steering wheel when braking
m mPedal pulsates when braking hard
m mBrakes binding
m mRear wheels locking under normal braking
Suspension and steering systems10
m
mVehicle pulls to one side
m mWheel wobble and vibration
m mExcessive pitching and/or rolling around corners, or during braking
m mWandering or general instability
m mExcessively-stiff steering
m mExcessive play in steering
m mLack of power assistance
m mTyre wear excessive
Electrical system11
m
mLights inoperative
m mIgnition/no-charge warning light remains illuminated with engine
running
m mIgnition/no-charge warning light fails to come on
m mBattery will not hold a charge for more than a few days
m mInstrument readings inaccurate or erratic
m mHorn inoperative, or unsatisfactory in operation
m mWindscreen/tailgate wipers inoperative, or unsatisfactory in
operation
m mWindscreen/tailgate washers inoperative, or unsatisfactory in
operation
m mElectric windows inoperative, or unsatisfactory in operation
m mCentral locking system inoperative, or unsatisfactory in operation
Introduction
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Transmission fluid brown, or has burned smell
m m
Transmission fluid level low, or fluid in need of renewal (Chapter 1).
General gear selection problems
m m
The most likely cause of gear selection problems is a faulty or
poorly-adjusted gear selector mechanism. The following are common
problems associated with a faulty selector mechanism:
a)Engine starting in gears other than Park or Neutral.
b)Indicator on gear selector lever pointing to a gear other than
the one actually being used.
c)Vehicle moves when in Park or Neutral.
d)Poor gear shift quality, or erratic gear changes.
m
mRefer any problems to a Ford dealer, or an automatic transmission
specialist.
Transmission will not downshift (kickdown) with
accelerator pedal fully depressed
m m
Low transmission fluid level (Chapter 1).
m
mIncorrect selector adjustment (Chapter 7B).
Engine will not start in any gear, or starts in gears
other than Park or Neutral
m m
Faulty starter inhibitor switch (Chapter 7B).
m
mIncorrect selector adjustment (Chapter 7B).
Transmission slips, shifts roughly, is noisy, or has no
drive in forward or reverse gears
m m
There are many probable causes for the above problems, but the
home mechanic should be concerned with only one possibility - fluid
level. Before taking the vehicle to a dealer or transmission specialist,
check the fluid level and condition of the fluid as described in Chapter 1.
Correct the fluid level as necessary, or change the fluid and filter if
needed. If the problem persists, professional help will be necessary.
REF•9Fault Finding
7Propeller shaft
Clunking or knocking noise when taking up drive
m m
Worn universal joints (Chapter 8).m
mLoose flange bolt (Chapter 8).
Vibration when accelerating or decelerating
m m
Worn centre bearing or universal joints (Chapter 8).m
mBent or distorted shaft (Chapter 8).m
mDeteriorated rubber insulator on centre bearing ( Chapter 8)
8Final drive and driveshafts
Excessive final drive noise
m m
Oil level low, or incorrect grade (Chapter 1)m
mWorn bearings (Chapter 9)m
mWorn or badly adjusted crownwheel and pinion (Chapter 9)m
mLoose or deteriorated final drive mountings (Chapter 9)
Oil leakage from final drive
m m
Pinion or output flange oil seal leaking (Chapter 9)
m
mRear cover leaking (Chapter 9)
m
mCover or casing cracked (Chapter 9)
Grating, knocking or vibration from driveshafts
m m
Flange screws loose (Chapter 9)
m
mCV joints worn (Chapter 9)
m
mDriveshaft bent (Chapter 9)
9Braking system
Note:Make sure that the tyres are in good condition and correctly
inflated, that the front wheel alignment is correct, and that the vehicle is
not loaded with weight in an unequal manner. Apart from checking the
condition of all pipe and hose connections, any faults occurring on the
anti-lock braking system should be referred to a Ford dealer for diagnosis.
Vehicle pulls to one side under braking
m m
Worn, defective, damaged or contaminated front or rear brake
pads on one side (Chapters 1 and 10).
m mSeized or partially-seized front or rear brake caliper piston (Chapter 10).m
mA mixture of brake pad lining materials fitted between sides
(Chapter 10).
m mBrake caliper mounting bolts loose (Chapter 10).m
mWorn or damaged steering or suspension components (Chapters 1
and 11).
Noise (grinding or high-pitched squeal) when brakes
applied
m m
Brake pad friction material worn down to metal backing (Chapters 1
and 10).
m mExcessive corrosion of brake disc - may be apparent after the
vehicle has been standing for some time (Chapters 1 and 10).
Excessive brake pedal travel
m m
Faulty master cylinder (Chapter 10).
m
mAir in hydraulic system (Chapter 10).
m
mFaulty vacuum servo unit (Chapter 10).
Brake pedal feels spongy when depressed
m m
Air in hydraulic system (Chapter 10).
m
mDeteriorated flexible rubber brake hoses (Chapters 1 and 10).
m
mMaster cylinder mountings loose (Chapter 10).
m
mFaulty master cylinder (Chapter 10).
Excessive brake pedal effort required to stop vehicle
m m
Faulty vacuum servo unit (Chapter 10).
m
mDisconnected, damaged or insecure brake servo vacuum hose
(Chapters 1 and 10).
m mPrimary or secondary hydraulic circuit failure (Chapter 10).
m
mSeized brake caliper piston(s) (Chapter 10).
m
mBrake pads incorrectly fitted (Chapter 10).
m
mIncorrect grade of brake pads fitted (Chapter 10).
m
mBrake pads contaminated (Chapter 10).
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Ignition/no-charge warning light remains illuminated
with engine running
m m
Auxiliary drivebelt broken, worn, or incorrectly adjusted (Chapter 1).m
mAlternator brushes worn, sticking, or dirty (Chapter 5).m
mAlternator brush springs weak or broken (Chapter 5).m
mInternal fault in alternator or voltage regulator (Chapter 5).m
mBroken, disconnected, or loose wiring in charging circuit (Chapter 5).
Ignition/no-charge warning light fails to come on
m m
Warning light bulb blown (Chapter 13).m
mBroken, disconnected, or loose wiring in warning light circuit
(Chapter 13).
m mAlternator faulty (Chapter 5).
Battery will not hold a charge for more than a few days
m m
Battery defective internally (Chapter 5).m
mBattery electrolyte level low - where applicable (Chapter 1).m
mBattery terminal connections loose or corroded (Chapter 1).m
mAuxiliary drivebelt worn - or incorrectly adjusted, where applicable
(Chapter 1).
m mAlternator not charging at correct output (Chapter 5).m
mAlternator or voltage regulator faulty (Chapter 5).m
mShort-circuit causing continual battery drain (Chapters 5 and 13).
Instrument readings inaccurate or erratic
Instrument readings increase with engine speed
m
mFaulty voltage regulator (Chapter 13).
Fuel or temperature gauges give no reading
m
mFaulty gauge sender unit (Chapters 4 and 5).m
mWiring open-circuit (Chapter 13).m
mFaulty gauge (Chapter 13).
Fuel or temperature gauges give continuous maximum
reading
m mFaulty gauge sender unit (Chapters 4 and 5).m
mWiring short-circuit (Chapter 13).m
mFaulty gauge (Chapter 13).
Horn inoperative, or unsatisfactory in operation
Horn operates all the time
m
mHorn contacts permanently bridged or horn push stuck down
(Chapter 13).
Horn fails to operate
m mBlown fuse (Chapter 13).m
mCable or cable connections loose, broken or disconnected
(Chapter 13).
m mFaulty horn (Chapter 13).
Horn emits intermittent or unsatisfactory sound
m
mCable connections loose (Chapter 13).m
mHorn mountings loose (Chapter 13).m
mFaulty horn (Chapter 13).
Windscreen/tailgate wipers inoperative, or
unsatisfactory in operation
Wipers fail to operate, or operate very slowly
m mWiper blades stuck to screen, or linkage seized or binding
(Chapters 1 and 13).
m mBlown fuse (Chapter 13).m
mCable or cable connections loose, broken or disconnected
(Chapter 13).
m mFaulty relay (Chapter 13).m
mFaulty wiper motor (Chapter 13).
Wiper blades sweep over too large or too small an area of
the glass
m mWiper arms incorrectly positioned on spindles (Chapter 1).m
mExcessive wear of wiper linkage (Chapter 13).m
mWiper motor or linkage mountings loose or insecure (Chapter 13).
Wiper blades fail to clean the glass effectively
m
mWiper blade rubbers worn or perished (Chapter 1).m
mWiper arm tension springs broken, or arm pivots seized (Chapter 13).m
mInsufficient windscreen washer additive to adequately remove road
film (Chapter 1).
Windscreen/tailgate washers inoperative, or
unsatisfactory in operation
One or more washer jets inoperative
m mBlocked washer jet (Chapter 1).m
mDisconnected, kinked or restricted fluid hose (Chapter 13).m
mInsufficient fluid in washer reservoir (Chapter 1).
Washer pump fails to operate
m
mBroken or disconnected wiring or connections (Chapter 13).m
mBlown fuse (Chapter 13).m
mFaulty washer switch (Chapter 13).m
mFaulty washer pump (Chapter 13).
Washer pump runs for some time before fluid is emitted
from jets
m mFaulty one-way valve in fluid supply hose (Chapter 13).
Electric windows inoperative, or unsatisfactory in
operation
Window glass will only move in one direction
m mFaulty switch (Chapter 13).
Window glass slow to move
m
mRegulator seized or damaged, or in need of lubrication (Chapter 12).m
mDoor internal components or trim fouling regulator (Chapter 12).m
mFaulty motor (Chapter 12).
Window glass fails to move
m
mBlown fuse (Chapter 13).m
mFaulty relay (Chapter 13).m
mBroken or disconnected wiring or connections (Chapter 13).m
mFaulty motor (Chapter 13).
Central locking system inoperative, or unsatisfactory
in operation
Complete system failure
m mBlown fuse (Chapter 13).m
mFaulty relay (Chapter 13).m
mBroken or disconnected wiring or connections (Chapter 13).
Latch locks but will not unlock, or unlocks but will not lock
m
mFaulty switch (Chapter 13).m
mBroken or disconnected latch operating rods or levers (Chapter 12).m
mFaulty relay (Chapter 13).
One solenoid/motor fails to operate
m
mBroken or disconnected wiring or connections (Chapter 13).m
mFaulty solenoid/motor (Chapter 12).m
mBroken, binding or disconnected latch operating rods or levers
(Chapter 12).
m mFault in door latch (Chapter 12).
REF•11Fault Finding
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REF•13Glossary of Technical Terms
Catalytic converterA silencer-like device in
the exhaust system which converts certain
pollutants in the exhaust gases into less
harmful substances.
CirclipA ring-shaped clip used to prevent
endwise movement of cylindrical parts and
shafts. An internal circlip is installed in a
groove in a housing; an external circlip fits into
a groove on the outside of a cylindrical piece
such as a shaft.
ClearanceThe amount of space between
two parts. For example, between a piston and
a cylinder, between a bearing and a journal,
etc.
Coil springA spiral of elastic steel found in
various sizes throughout a vehicle, for
example as a springing medium in the
suspension and in the valve train.
CompressionReduction in volume, and
increase in pressure and temperature, of a
gas, caused by squeezing it into a smaller
space.
Compression ratioThe relationship between
cylinder volume when the piston is at top
dead centre and cylinder volume when the
piston is at bottom dead centre.
Constant velocity (CV) jointA type of
universal joint that cancels out vibrations
caused by driving power being transmitted
through an angle.
Core plugA disc or cup-shaped metal device
inserted in a hole in a casting through which
core was removed when the casting was
formed. Also known as a freeze plug or
expansion plug.
CrankcaseThe lower part of the engine
block in which the crankshaft rotates.
CrankshaftThe main rotating member, or
shaft, running the length of the crankcase,
with offset “throws” to which the connecting
rods are attached.
Crocodile clipSee Alligator clipDDiagnostic codeCode numbers obtained by
accessing the diagnostic mode of an engine
management computer. This code can be
used to determine the area in the system
where a malfunction may be located.
Disc brakeA brake design incorporating a
rotating disc onto which brake pads are
squeezed. The resulting friction converts the
energy of a moving vehicle into heat.
Double-overhead cam (DOHC)An engine
that uses two overhead camshafts, usually
one for the intake valves and one for the
exhaust valves.
Drivebelt(s)The belt(s) used to drive
accessories such as the alternator, water
pump, power steering pump, air conditioning
compressor, etc. off the crankshaft pulley.
DriveshaftAny shaft used to transmit
motion. Commonly used when referring to the
axleshafts on a front wheel drive vehicle.
Drum brakeA type of brake using a drum-
shaped metal cylinder attached to the inner
surface of the wheel. When the brake pedal is
pressed, curved brake shoes with friction
linings press against the inside of the drum to
slow or stop the vehicle.
EEGR valveA valve used to introduce exhaust
gases into the intake air stream.
Electronic control unit (ECU)A computer
which controls (for instance) ignition and fuel
injection systems, or an anti-lock braking
system. For more information refer to the
Haynes Automotive Electrical and Electronic
Systems Manual.
Electronic Fuel Injection (EFI)A computer
controlled fuel system that distributes fuel
through an injector located in each intake port
of the engine.
Emergency brakeA braking system,
independent of the main hydraulic system,
that can be used to slow or stop the vehicle if
the primary brakes fail, or to hold the vehicle
stationary even though the brake pedal isn’t
depressed. It usually consists of a hand lever
that actuates either front or rear brakes
mechanically through a series of cables and
linkages. Also known as a handbrake or
parking brake.EndfloatThe amount of lengthwise
movement between two parts. As applied to a
crankshaft, the distance that the crankshaft
can move forward and back in the cylinder
block.
Engine management system (EMS)A
computer controlled system which manages
the fuel injection and the ignition systems in
an integrated fashion.
Exhaust manifoldA part with several
passages through which exhaust gases leave
the engine combustion chambers and enter
the exhaust pipe.
F
Fan clutchA viscous (fluid) drive coupling
device which permits variable engine fan
speeds in relation to engine speeds.
Feeler bladeA thin strip or blade of hardened
steel, ground to an exact thickness, used to
check or measure clearances between parts.
Firing orderThe order in which the engine
cylinders fire, or deliver their power strokes,
beginning with the number one cylinder.
Flywheel A heavy spinning wheel in which
energy is absorbed and stored by means of
momentum. On cars, the flywheel is attached
to the crankshaft to smooth out firing
impulses.
Free playThe amount of travel before any
action takes place. The “looseness” in a
linkage, or an assembly of parts, between the
initial application of force and actual
movement. For example, the distance the
brake pedal moves before the pistons in the
master cylinder are actuated.
FuseAn electrical device which protects a
circuit against accidental overload. The typical
fuse contains a soft piece of metal which is
calibrated to melt at a predetermined current
flow (expressed as amps) and break the
circuit.
Fusible linkA circuit protection device
consisting of a conductor surrounded by
heat-resistant insulation. The conductor is
smaller than the wire it protects, so it acts as
the weakest link in the circuit. Unlike a blown
fuse, a failed fusible link must frequently be
cut from the wire for replacement.Catalytic converter
Crankshaft assembly
Accessory drivebelts
Feeler blade
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