OPEL VECTRA 1988 Service Repair Manual

Engine
m mEngine fails to rotate when attempting to start
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 system
m
mOverheating
m mOvercooling
m mExternal coolant leakage
m mInternal coolant leakage
m mCorrosion
Fuel and exhaust systems
m
mExcessive fuel consumption
m mFuel leakage and/or fuel odour
m mExcessive noise or fumes from exhaust system
Clutch
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 transmission
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 transmission
m
mFluid leakage
m mTransmission fluid brown, or has burned smell
m 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
Driveshafts
m mClicking or knocking noise on turns (at slow speed on full-lock)
m mVibration when accelerating or decelerating
Braking system
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 mBrakes binding
m mRear wheels locking under normal braking
Suspension and steering systems
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 system
m
mBattery will not hold a charge for more than a few days
m mIgnition/no-charge warning light remains illuminated with engine
running
m mIgnition/no-charge warning light fails to come on
m mLights inoperative
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
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 that 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 begininvestigations. 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). However, 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 spark plugs may only be pointers to some underlying fault.
REF•12Fault Finding
Introduction

The pages that follow provide an easy-reference guide to the more
common problems that 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 that 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.
Do not overlook the obvious. For example, if the vehicle will not start,
is there petrol in the tank? (Do not take anyone else’s word on this
particular point, and do not 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
was not simply an incorrect grade of plug) will have to be established
and corrected.
Do not take anything for granted. Particularly, do not forget that a
“new” component may itself be defective (especially if it’s been rattling
around in the boot for months). Also do not 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 will probably realise
that all the evidence was there from the start.
Engine fails to rotate when attempting to start
MBattery terminal connections loose or corroded (Chapter 1).
MBattery discharged or faulty (Chapter 5).
MBroken, loose or disconnected wiring in the starting circuit
(Chapter 5).
MDefective starter solenoid or switch (Chapter 5).
MDefective starter motor (Chapter 5).
MStarter pinion or flywheel ring gear teeth loose or broken
(Chapters 2A and 5).
MEngine earth strap broken or disconnected (Chapter 5).
Engine rotates, but will not start
MFuel tank empty.
MBattery discharged (engine rotates slowly), (Chapter 5).
MBattery terminal connections loose or corroded (Chapter 1).
MIgnition components damp or damaged (Chapters 1 and 5).
MBroken, loose or disconnected wiring in the ignition circuit
(Chapters 1 and 5).
MWorn, faulty or incorrectly gapped spark plugs (Chapter 1).
MChoke mechanism incorrectly adjusted, worn or sticking -
carburettor models (Chapter 4A).
MFaulty fuel cut-off solenoid - carburettor models (Chapter 4A).
MFuel injection system fault - fuel-injected models (Chapter 4B).
MMajor mechanical failure (e.g. camshaft drive), (Chapter 2A or 2B).
Engine difficult to start when cold
MBattery discharged (Chapter 5).
MBattery terminal connections loose or corroded (Chapter 1).
MWorn, faulty or incorrectly gapped spark plugs (Chapter 1).
MChoke mechanism incorrectly adjusted, worn or sticking -
carburettor models (Chapter 4A).
MFuel injection system fault - fuel-injected models (Chapter 4B).
MOther ignition system fault (Chapters 1 and 5).
MLow cylinder compressions (Chapter 2A).
Engine difficult to start when hot
MAir filter element dirty or clogged (Chapter 1).
MChoke mechanism incorrectly adjusted, worn or sticking -
carburettor models (Chapter 4A).
MFuel injection system fault - fuel-injected models (Chapter 4B).
MLow cylinder compressions (Chapter 2A).
Starter motor noisy or excessively rough in
engagement
MStarter pinion or flywheel ring gear teeth loose or broken
(Chapters 2A and 5).
MStarter motor mounting bolts loose or missing (Chapter 5).
MStarter motor internal components worn or damaged (Chapter 5).
Engine starts, but stops immediately
MLoose or faulty electrical connections in the ignition circuit
(Chapters 1 and 5B).
MVacuum leak at the carburettor/throttle body or inlet manifold
(Chapter 4A or 4B).
MBlocked carburettor jet(s) or internal passages - carburettor
models (Chapter 4A).
MBlocked injector/fuel injection system fault - fuel-injected models
(Chapter 4B).
Engine idles erratically
MAir filter element clogged (Chapter 1).
MVacuum leak at the carburettor/throttle body, inlet manifold or
associated hoses (Chapter 4A or 4B).
MWorn, faulty or incorrectly gapped spark plugs (Chapter 1).
MUneven or low cylinder compressions (Chapter 2A).
MCamshaft lobes worn (Chapter 2A or 2B).
MTiming belt incorrectly tensioned (Chapter 2A or 2B).
MBlocked carburettor jet(s) or internal passages - carburettor
models (Chapter 4A).
MBlocked injector/fuel injection system fault - fuel-injected models
(Chapter 4B).
Engine misfires at idle speed
MWorn, faulty or incorrectly gapped spark plugs (Chapter 1).
MFaulty spark plug HT leads (Chapter 1).
MVacuum leak at the carburettor/throttle body, inlet manifold or
associated hoses (Chapter 4A or 4B).
MBlocked carburettor jet(s) or internal passages - carburettor
models (Chapter 4A).
MBlocked injector/fuel injection system fault - fuel-injected models
(Chapter 4B).
MDistributor cap cracked or tracking internally (where applicable),
(Chapter 1).
MUneven or low cylinder compressions (Chapter 2A).
MDisconnected, leaking, or perished crankcase ventilation hoses
(Chapter 4C).
Engine misfires throughout the driving speed
range
MFuel filter choked (Chapter 1).
MFuel pump faulty, or delivery pressure low (Chapter 4A or 4B).
MFuel tank vent blocked, or fuel pipes restricted (Chapter 4A or 4B).
MVacuum leak at the carburettor/throttle body, inlet manifold or
associated hoses (Chapter 4A or 4B).
MWorn, faulty or incorrectly gapped spark plugs (Chapter 1).
MFaulty spark plug HT leads (Chapter 1).
MDistributor cap cracked or tracking internally (where applicable),
(Chapter 1).
Fault Finding REF•13
REF
Engine

MFaulty ignition coil (Chapter 5).
MUneven or low cylinder compressions (Chapter 2A).
MBlocked carburettor jet(s) or internal passages - carburettor
models (Chapter 4A).
MBlocked injector/fuel injection system fault - fuel-injected models
(Chapter 4B).
Engine hesitates on acceleration
MWorn, faulty or incorrectly gapped spark plugs (Chapter 1).
MVacuum leak at the carburettor/throttle body, inlet manifold or
associated hoses (Chapter 4A or 4B).
MBlocked carburettor jet(s) or internal passages - carburettor
models (Chapter 4A).
MBlocked injector/fuel injection system fault - fuel-injected models
(Chapter 4B).
Engine stalls
MVacuum leak at the carburettor/throttle body, inlet manifold or
associated hoses (Chapter 4A or 4B).
MFuel filter choked (Chapter 1).
MFuel pump faulty, or delivery pressure low (Chapter 4A or 4B).
MFuel tank vent blocked, or fuel pipes restricted (Chapter 4A or 4B).
MBlocked carburettor jet(s) or internal passages - carburettor
models (Chapter 4A).
MBlocked injector/fuel injection system fault - fuel-injected models
(Chapter 4B).
Engine lacks power
MTiming belt incorrectly fitted or tensioned (Chapter 2A or 2B).
MFuel filter choked (Chapter 1).
MFuel pump faulty, or delivery pressure low (Chapter 4A or 4B).
MUneven or low cylinder compressions (Chapter 2A).
MWorn, faulty or incorrectly gapped spark plugs (Chapter 1).
MVacuum leak at the carburettor/throttle body, inlet manifold or
associated hoses (Chapter 4A or 4B).
MBlocked carburettor jet(s) or internal passages - carburettor
models (Chapter 4A).
MBlocked injector/fuel injection system fault - fuel-injected models
(Chapter 4B).
MBrakes binding (Chapters 1 and 9).
MClutch slipping (Chapter 6).
Engine backfires
MTiming belt incorrectly fitted or tensioned (Chapter 2A or 2B).
MVacuum leak at the carburettor/throttle body, inlet manifold or
associated hoses (Chapter 4A or 4B).
MBlocked carburettor jet(s) or internal passages - carburettor
models (Chapter 4A).
MBlocked injector/fuel injection system fault - fuel-injected models
(Chapter 4B).
Oil pressure warning light illuminated with engine
running
MLow oil level, or incorrect oil grade (Chapter 1).
MFaulty oil pressure warning light switch (Chapter 12).
MWorn engine bearings and/or oil pump (Chapter 2A).
MHigh engine operating temperature (Chapter 3).
MOil pressure relief valve defective (Chapter 2A).
MOil pick-up strainer clogged (Chapter 2A).
Engine runs-on after switching off
MExcessive carbon build-up in engine (Chapter 2A).
MHigh engine operating temperature (Chapter 3).
MFaulty fuel cut-off solenoid - carburettor models (Chapter 4A).
MFuel injection system fault - fuel-injected models (Chapter 4B).
Engine noises
Pre-ignition (pinking) or knocking during acceleration or
under load
MIgnition timing incorrect/ignition system fault (Chapters 1 and 5).
MIncorrect grade of spark plug (Chapter 1).
MIncorrect grade of fuel (Chapter 1).
MVacuum leak at the carburettor/throttle body, inlet manifold or
associated hoses (Chapter 4A or 4B).
MExcessive carbon build-up in engine (Chapter 2A).
MBlocked carburettor jet(s) or internal passages - carburettor
models (Chapter 4A).
MBlocked injector/fuel injection system fault - fuel-injected models
(Chapter 4B).
Whistling or wheezing noises
MLeaking inlet manifold or carburettor/throttle body gasket
(Chapter 4A or 4B).
MLeaking exhaust manifold gasket or pipe-to-manifold joint
(Chapter 4C).
MLeaking vacuum hose (Chapters 4A, 4B, 4C, 5, 9 and 12).
MBlowing cylinder head gasket (Chapter 2A or 2B).
Tapping or rattling noises
MWorn valve gear or camshaft (Chapter 2A or 2B).
MAncillary component fault (coolant pump, alternator, etc.)
(Chapters 3, 5, etc.).
Knocking or thumping noises
MWorn big-end bearings (regular heavy knocking, perhaps less
under load), (Chapter 2A or 2B).
MWorn main bearings (rumbling and knocking, perhaps worsening
under load), (Chapter 2A or 2B).
MPiston slap (most noticeable when cold), (Chapter 2A).
MAncillary component fault (coolant pump, alternator, etc.)
(Chapters 3, 5, etc.).
REF•14Fault Finding
Engine (continued)

Excessive fuel consumption
MAir filter element dirty or clogged (Chapter 1).
MChoke cable incorrectly adjusted, or choke sticking - carburettor
models (Chapter 4A).
MFuel injection system fault - fuel-injected models (Chapter 4B).
MIgnition timing incorrect/ignition system fault (Chapters 1 and 5).
MTyres under-inflated (Chapter 1).
Fuel leakage and/or fuel odour
MDamaged or corroded fuel tank, pipes or connections (Chapter 4A
or 4B).
MCarburettor float chamber flooding (float height incorrect) -
carburettor models (Chapter 4A).
Excessive noise or fumes from exhaust system
MLeaking exhaust system or manifold joints (Chapters 1 and 4C).
MLeaking, corroded or damaged silencers or pipe (Chapters 1 and 4C).
MBroken mountings causing body or suspension contact (Chapter 1).
Pedal travels to floor - no pressure or very little
resistance
MBroken clutch cable (Chapter 6).
MIncorrect clutch cable adjustment (Chapter 6).
MBroken clutch release bearing or fork (Chapter 6).
MBroken diaphragm spring in clutch pressure plate (Chapter 6).
Clutch fails to disengage (unable to select gears).
MIncorrect clutch cable adjustment (Chapter 6).
MClutch disc sticking on transmission input shaft splines (Chapter 6).
MClutch disc sticking to flywheel or pressure plate (Chapter 6).
MFaulty pressure plate assembly (Chapter 6).
MClutch release mechanism worn or incorrectly assembled (Chapter 6).
Clutch slips (engine speed increases, with no
increase in vehicle speed).
MIncorrect clutch cable adjustment (Chapter 6).
MClutch disc linings excessively worn (Chapter 6).MClutch disc linings contaminated with oil or grease (Chapter 6).
MFaulty pressure plate or weak diaphragm spring (Chapter 6).
Judder as clutch is engaged
MClutch disc linings contaminated with oil or grease (Chapter 6).
MClutch disc linings excessively worn (Chapter 6).
MClutch cable sticking or frayed (Chapter 6).
MFaulty or distorted pressure plate or diaphragm spring (Chapter 6).
MWorn or loose engine or transmission mountings (Chapter 2A or 2B).
MClutch disc hub or transmission input shaft splines worn (Chapter 6).
Noise when depressing or releasing clutch pedal
MWorn clutch release bearing (Chapter 6).
MWorn or dry clutch pedal bushes (Chapter 6).
MFaulty pressure plate assembly (Chapter 6).
MPressure plate diaphragm spring broken (Chapter 6).
MBroken clutch disc cushioning springs (Chapter 6).
Fault Finding REF•15
REF
Overheating
MInsufficient coolant in system (Chapter 1).
MThermostat faulty (Chapter 3).
MRadiator core blocked, or grille restricted (Chapter 3).
MElectric cooling fan or thermoswitch faulty (Chapter 3).
MPressure cap faulty (Chapter 3).
MIgnition timing incorrect/ignition system fault (Chapters 1 and 5).
MInaccurate temperature gauge sender unit (Chapter 3).
MAirlock in cooling system (Chapter 1).
Overcooling
MThermostat faulty (Chapter 3).
MInaccurate temperature gauge sender unit (Chapter 3).
External coolant leakage
MDeteriorated or damaged hoses or hose clips (Chapter 1).
MRadiator core or heater matrix leaking (Chapter 3).
MPressure cap faulty (Chapter 3).
MWater pump seal leaking (Chapter 3).
MBoiling due to overheating (Chapter 3).
MCore plug leaking (Chapter 2A).
Internal coolant leakage
MLeaking cylinder head gasket (Chapter 2A or 2B).
MCracked cylinder head or cylinder bore (Chapter 2A or 2B).
Corrosion
MInfrequent draining and flushing (Chapter 1).
MIncorrect coolant mixture or inappropriate coolant type (Chapter 1).
Cooling system
Clutch
Fuel and exhaust systems

Note:Due to the complexity of the automatic transmission, it is difficult
for the home mechanic to properly diagnose and service this unit. For
problems other than the following, the vehicle should be taken to a
dealer service department or automatic transmission specialist. Do not
be too hasty in removing the transmission if a fault is suspected, as
most of the testing is carried out with the unit still fitted.
Fluid leakage
MAutomatic transmission fluid is usually dark in colour. Fluid leaks
should not be confused with engine oil, which can easily be blown
onto the transmission by airflow.
MTo determine the source of a leak, first remove all built-up dirt and
grime from the transmission housing and surrounding areas using
a degreasing agent, or by steam-cleaning. Drive the vehicle at low
speed, so airflow will not blow the leak far from its source. Raise
and support the vehicle, and determine where the leak is coming
from. The following are common areas of leakage:
a)Fluid pan or “sump” (Chapter 1 and 7B).
b)Dipstick tube (Chapter 1 and 7B).
c)Transmission-to-fluid cooler pipes/unions (Chapter 7B).
Transmission fluid brown, or has burned smell
MTransmission fluid level low, or fluid in need of renewal (Chapter 1).
General gear selection problems
MChapter 7B deals with checking and adjusting the selector cable
on automatic transmissions. The following are common problems
that may be caused by a poorly adjusted cable:a)Engine starting in gears other than Park or Neutral.
b)Indicator panel indicating 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.
MRefer to Chapter 7B for the selector cable adjustment procedure.
Transmission will not downshift (kickdown) with
accelerator pedal fully depressed
MLow transmission fluid level (Chapter 1).
MIncorrect selector cable adjustment (Chapter 7B).
Engine will not start in any gear, or starts in gears
other than Park or Neutral
MIncorrect starter/inhibitor switch adjustment (Chapter 7B).
MIncorrect selector cable adjustment (Chapter 7B).
Transmission slips, shifts roughly, is noisy, or has
no drive in forward or reverse gears
MThere 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.
Clicking or knocking noise on turns (at slow speed
on full-lock)
MLack of constant velocity joint lubricant, possibly due to damaged
gaiter (Chapter 8).
MWorn outer constant velocity joint (Chapter 8).
Vibration when accelerating or decelerating
MWorn inner constant velocity joint (Chapter 8).
MBent or distorted driveshaft (Chapter 8).
REF•16Fault Finding
Automatic transmission
Driveshafts
Noisy in neutral with engine running
MInput shaft bearings worn (noise apparent with clutch pedal
released, but not when depressed), (Chapter 7A).*
MClutch release bearing worn (noise apparent with clutch pedal
depressed, possibly less when released), (Chapter 6).
Noisy in one particular gear
MWorn, damaged or chipped gear teeth (Chapter 7A).*
Difficulty engaging gears
MClutch fault (Chapter 6).
MWorn or damaged gear linkage (Chapter 7A).
MIncorrectly adjusted gear linkage (Chapter 7A).
MWorn synchroniser units (Chapter 7A).*
Jumps out of gear
MWorn or damaged gear linkage (Chapter 7A).
MIncorrectly adjusted gear linkage (Chapter 7A).MWorn synchroniser units (Chapter 7A).*
MWorn selector forks (Chapter 7A).*
Vibration
MLack of oil (Chapter 1).
MWorn bearings (Chapter 7A).*
Lubricant leaks
MLeaking differential output oil seal (Chapter 7A).
MLeaking housing joint (Chapter 7A).*
MLeaking input shaft oil seal (Chapter 7A).*
* Although the corrective action necessary to remedy the symptoms
described is beyond the scope of the home mechanic, the above
information should be helpful in isolating the cause of the condition.
This should enable the owner can communicate clearly with a
professional mechanic.
Manual transmission

Note:Before diagnosing suspension or steering faults, be sure that the
trouble is not due to incorrect tyre pressures, mixtures of tyre types, or
binding brakes.
Vehicle pulls to one side
MDefective tyre (Chapter 1).
MExcessive wear in suspension or steering components (Chapters 1
and 10).
MIncorrect front wheel alignment (Chapter 10).
MAccident damage to steering or suspension components
(Chapter 1).
Wheel wobble and vibration
MFront roadwheels out of balance (vibration felt mainly through the
steering wheel), (Chapters 1 and 10).
MRear roadwheels out of balance (vibration felt throughout the
vehicle), (Chapters 1 and 10).
MRoadwheels damaged or distorted (Chapters 1 and 10).
MFaulty or damaged tyre (Chapter 1).
MWorn steering or suspension joints, bushes or components
(Chapters 1 and 10).
MWheel bolts loose (Chapters 1 and 10).
Excessive pitching and/or rolling around corners,
or during braking
MDefective shock absorbers (Chapters 1 and 10).
MBroken or weak spring and/or suspension component (Chapters 1
and 10).
MWorn or damaged anti-roll bar or mountings (Chapter 10).
Wandering or general instability
MIncorrect front wheel alignment (Chapter 10).
MWorn steering or suspension joints, bushes or components
(Chapters 1 and 10).
MRoadwheels out of balance (Chapters 1 and 10).
MFaulty or damaged tyre (Chapter 1).
MWheel bolts loose (Chapters 1 and 10).
MDefective shock absorbers (Chapters 1 and 10).
Excessively stiff steering
MLack of steering gear lubricant (Chapter 10).
MSeized track rod end balljoint or suspension balljoint (Chapters 1
and 10).
MBroken or incorrectly adjusted auxiliary drivebelt - power steering
(Chapter 1).
Fault Finding REF•17
REF
Note:Before assuming that a brake problem exists, 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 Peugeot dealer for diagnosis.
Vehicle pulls to one side under braking
MWorn, defective, damaged or contaminated brake pads/shoes on
one side (Chapters 1 and 9).
MSeized or partially seized front brake caliper/wheel cylinder piston
(Chapters 1 and 9).
MA mixture of brake pad/shoe lining materials fitted between sides
(Chapters 1 and 9).
MBrake caliper or backplate mounting bolts loose (Chapter 9).
MWorn or damaged steering or suspension components
(Chapters 1 and 10).
Noise (grinding or high-pitched squeal) when
brakes applied
MBrake pad or shoe friction lining material worn down to metal
backing (Chapters 1 and 9).
MExcessive corrosion of brake disc or drum. This may be apparent
after the vehicle has been standing for some time (Chapters 1 and 9).
MForeign object (stone chipping, etc.) trapped between brake disc
and shield (Chapters 1 and 9).
Excessive brake pedal travel
MInoperative rear brake self-adjust mechanism - drum brakes
(Chapters 1 and 9).
MFaulty master cylinder (Chapter 9).
MAir in hydraulic system (Chapters 1 and 9).
MFaulty vacuum servo unit (Chapter 9).
Brake pedal feels spongy when depressed
MAir in hydraulic system (Chapters 1 and 9).
MDeteriorated flexible rubber brake hoses (Chapters 1 and 9).
MMaster cylinder mounting nuts loose (Chapter 9).
MFaulty master cylinder (Chapter 9).
Excessive brake pedal effort required to stop
vehicle
MFaulty vacuum servo unit (Chapter 9).
MDisconnected, damaged or insecure brake servo vacuum hose
(Chapter 9).
MPrimary or secondary hydraulic circuit failure (Chapter 9).
MSeized brake caliper or wheel cylinder piston(s) (Chapter 9).
MBrake pads or brake shoes incorrectly fitted (Chapters 1 and 9).
MIncorrect grade of brake pads or brake shoes fitted (Chapters 1
and 9).
MBrake pads or brake shoe linings contaminated (Chapters 1 and 9).
Judder felt through brake pedal or steering wheel
when braking
MExcessive run-out or distortion of discs/drums (Chapters 1 and 9).
MBrake pad or brake shoe linings worn (Chapters 1 and 9).
MBrake caliper or brake backplate mounting bolts loose (Chapter 9).
MWear in suspension or steering components or mountings
(Chapters 1 and 10).
Brakes binding
MSeized brake caliper or wheel cylinder piston(s) (Chapter 9).
MIncorrectly adjusted handbrake mechanism (Chapter 9).
MFaulty master cylinder (Chapter 9).
Rear wheels locking under normal braking
MRear brake shoe linings contaminated (Chapters 1 and 9).
MFaulty brake pressure regulator (Chapter 9).
Braking system
Suspension and steering

Note:For problems associated with the starting system, refer to the
faults listed under “Engine” earlier in this Section.
Battery will not hold a charge for more than a few
days
MBattery defective internally (Chapter 5).
MBattery terminal connections loose or corroded (Chapter 1).
MAuxiliary drivebelt worn or incorrectly adjusted (Chapter 1).
MAlternator not charging at correct output (Chapter 5).
MAlternator or voltage regulator faulty (Chapter 5).
MShort-circuit causing continual battery drain (Chapters 5 and 12).
Ignition/no-charge warning light remains
illuminated with engine running
MAuxiliary drivebelt broken, worn, or incorrectly adjusted (Chapter 1).
MAlternator brushes worn, sticking, or dirty (Chapter 5).
MAlternator brush springs weak or broken (Chapter 5).
MInternal fault in alternator or voltage regulator (Chapter 5).
MBroken, disconnected, or loose wiring in charging circuit
(Chapter 5).
Ignition/no-charge warning light fails to come on
MWarning light bulb blown (Chapter 12).
MBroken, disconnected, or loose wiring in warning light circuit
(Chapter 12).
MAlternator faulty (Chapter 5).
Lights inoperative
MBulb blown (Chapter 12).
MCorrosion of bulb or bulbholder contacts (Chapter 12).
MBlown fuse (Chapter 12).
MFaulty relay (Chapter 12).
MBroken, loose, or disconnected wiring (Chapter 12).
MFaulty switch (Chapter 12).
Instrument readings inaccurate or erratic
Instrument readings increase with engine speed
MFaulty voltage regulator (Chapter 12).
Fuel or temperature gauges give no reading
MFaulty gauge sender unit (Chapters 3, 4A and 4B).
MWiring open-circuit (Chapter 12).
MFaulty gauge (Chapter 12).
Fuel or temperature gauges give continuous maximum
reading
MFaulty gauge sender unit (Chapters 3, 4A and 4B).
MWiring short-circuit (Chapter 12).
MFaulty gauge (Chapter 12). MIncorrect front wheel alignment (Chapter 10).
MSteering rack or column bent or damaged (Chapter 10).
Excessive play in steering
MWorn steering column intermediate shaft universal joint
(Chapter 10).
MWorn steering track rod end balljoints (Chapters 1 and 10).
MWorn rack-and-pinion steering gear (Chapter 10).
MWorn steering or suspension joints, bushes or components
(Chapters 1 and 10).
Lack of power assistance
MBroken or incorrectly adjusted auxiliary drivebelt (Chapter 1).
MIncorrect power steering fluid level (Chapter 1).
MRestriction in power steering fluid hoses (Chapter 1).
MFaulty power steering pump (Chapter 10).
MFaulty rack-and-pinion steering gear (Chapter 10).
Tyre wear excessive
Tyres worn on inside or outside edges
MTyres under-inflated (wear on both edges), (Chapter 1).
MIncorrect camber or castor angles (wear on one edge only),
(Chapter 10).
MWorn steering or suspension joints, bushes or components
(Chapters 1 and 10).
MExcessively hard cornering.
MAccident damage.
Tyre treads exhibit feathered edges
MIncorrect toe setting (Chapter 10).
Tyres worn in centre of tread
MTyres over-inflated (Chapter 1).
Tyres worn on inside and outside edges
MTyres under-inflated (Chapter 1).
Tyres worn unevenly
MTyres/wheels out of balance (Chapter 1).
MExcessive wheel or tyre run-out (Chapter 1).
MWorn shock absorbers (Chapters 1 and 10).
MFaulty tyre (Chapter 1).
REF•18Fault Finding
Electrical system
Suspension and steering (continued)

Horn inoperative, or unsatisfactory in operation
Horn operates all the time
MHorn push either earthed or stuck down (Chapter 12).
MHorn cable-to-horn push earthed (Chapter 12).
Horn fails to operate
MBlown fuse (Chapter 12).
MCable or cable connections loose, broken or disconnected
(Chapter 12).
MFaulty horn (Chapter 12).
Horn emits intermittent or unsatisfactory sound
MCable connections loose (Chapter 12).
MHorn mountings loose (Chapter 12).
MFaulty horn (Chapter 12).
Windscreen/tailgate wipers inoperative, or unsat-
isfactory in operation
Wipers fail to operate, or operate very slowly
MWiper blades stuck to screen, or linkage seized or binding
(Chapters 1 and 12).
MBlown fuse (Chapter 12).
MCable or cable connections loose, broken or disconnected
(Chapter 12).
MFaulty relay (Chapter 12).
MFaulty wiper motor (Chapter 12).
Wiper blades sweep over too large or too small an area of
the glass
MWiper arms incorrectly positioned on spindles (Chapter 1).
MExcessive wear of wiper linkage (Chapter 12).
MWiper motor or linkage mountings loose or insecure (Chapter 12).
Wiper blades fail to clean the glass effectively
MWiper blade rubbers worn or perished (Chapter 1).
MWiper arm tension springs broken, or arm pivots seized
(Chapter 12).
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
MBlocked washer jet (Chapter 1).
MDisconnected, kinked or restricted fluid hose (Chapter 12).
MInsufficient fluid in washer reservoir (Chapter 1).
Washer pump fails to operate
MBroken or disconnected wiring or connections (Chapter 12).
MBlown fuse (Chapter 12).
MFaulty washer switch (Chapter 12).
MFaulty washer pump (Chapter 12).
Washer pump runs for some time before fluid is emitted
from jets
MFaulty one-way valve in fluid supply hose (Chapter 12).
Electric windows inoperative, or unsatisfactory in
operation
Window glass will only move in one direction
MFaulty switch (Chapter 12).
Window glass slow to move
MRegulator seized or damaged, or in need of lubrication
(Chapter 11).
MDoor internal components or trim fouling regulator (Chapter 11).
MFaulty motor (Chapter 12).
Window glass fails to move
MBlown fuse (Chapter 12).
MFaulty relay (Chapter 12).
MBroken or disconnected wiring or connections (Chapter 12).
MFaulty motor (Chapter 12).
Central locking system inoperative, or unsatis-
factory in operation
Complete system failure
MBlown fuse (Chapter 12).
MFaulty relay (Chapter 12).
MBroken or disconnected wiring or connections (Chapter 12).
MFaulty control module (Chapter 12).
Latch locks but will not unlock, or unlocks but will not lock
MFaulty master switch (Chapter 12).
MBroken or disconnected latch operating rods or levers
(Chapter 11).
MFaulty relay (Chapter 12).
MFaulty control module (Chapter 12).
One solenoid/motor fails to operate
MBroken or disconnected wiring or connections (Chapter 12).
MFaulty solenoid/motor (Chapter 12).
MBroken, binding or disconnected latch operating rods or levers
(Chapter 11).
MFault in door latch (Chapter 11).
Fault Finding REF•19
REF
Electrical system (continued)

REF•20Glossary of Technical Terms
A
ABS (Anti-lock brake system)A system,
usually electronically controlled, that senses
incipient wheel lockup during braking and
relieves hydraulic pressure at wheels that are
about to skid.
Air bag An inflatable bag hidden in the
steering wheel (driver’s side) or the dash or
glovebox (passenger side). In a head-on
collision, the bags inflate, preventing the
driver and front passenger from being thrown
forward into the steering wheel or windscreen.
Air cleanerA metal or plastic housing,
containing a filter element, which removes
dust and dirt from the air being drawn into the
engine.
Air filter elementThe actual filter in an air
cleaner system, usually manufactured from
pleated paper and requiring renewal at regular
intervals.
Allen keyA hexagonal wrench which fits into
a recessed hexagonal hole.
Alligator clipA long-nosed spring-loaded
metal clip with meshing teeth. Used to make
temporary electrical connections.
AlternatorA component in the electrical
system which converts mechanical energy
from a drivebelt into electrical energy to
charge the battery and to operate the starting
system, ignition system and electrical
accessories.
Ampere (amp)A unit of measurement for the
flow of electric current. One amp is the
amount of current produced by one volt
acting through a resistance of one ohm.
Anaerobic sealerA substance used to
prevent bolts and screws from loosening.
Anaerobic means that it does not require
oxygen for activation. The Loctite brand is
widely used.
AntifreezeA substance (usually ethylene
glycol) mixed with water, and added to a
vehicle’s cooling system, to prevent freezing
of the coolant in winter. Antifreeze also
contains chemicals to inhibit corrosion and
the formation of rust and other deposits thatwould tend to clog the radiator and coolant
passages and reduce cooling efficiency.
Anti-seize compoundA coating that
reduces the risk of seizing on fasteners that
are subjected to high temperatures, such as
exhaust manifold bolts and nuts.
AsbestosA natural fibrous mineral with great
heat resistance, commonly used in the
composition of brake friction materials.
Asbestos is a health hazard and the dust
created by brake systems should never be
inhaled or ingested.
AxleA shaft on which a wheel revolves, or
which revolves with a wheel. Also, a solid
beam that connects the two wheels at one
end of the vehicle. An axle which also
transmits power to the wheels is known as a
live axle.
AxleshaftA single rotating shaft, on either
side of the differential, which delivers power
from the final drive assembly to the drive
wheels. Also called a driveshaft or a halfshaft.
BBall bearingAn anti-friction bearing
consisting of a hardened inner and outer race
with hardened steel balls between two races.BearingThe curved surface on a shaft or in a
bore, or the part assembled into either, that
permits relative motion between them with
minimum wear and friction.
Big-end bearingThe bearing in the end of
the connecting rod that’s attached to the
crankshaft.
Bleed nippleA valve on a brake wheel
cylinder, caliper or other hydraulic component
that is opened to purge the hydraulic system
of air. Also called a bleed screw.
Brake bleedingProcedure for removing air
from lines of a hydraulic brake system.
Brake discThe component of a disc brake
that rotates with the wheels.
Brake drumThe component of a drum brake
that rotates with the wheels.
Brake liningsThe friction material which
contacts the brake disc or drum to retard the
vehicle’s speed. The linings are bonded or
riveted to the brake pads or shoes.
Brake padsThe replaceable friction pads
that pinch the brake disc when the brakes are
applied. Brake pads consist of a friction
material bonded or riveted to a rigid backing
plate.
Brake shoeThe crescent-shaped carrier to
which the brake linings are mounted and
which forces the lining against the rotating
drum during braking.
Braking systemsFor more information on
braking systems, consult the Haynes
Automotive Brake Manual.
Breaker barA long socket wrench handle
providing greater leverage.
BulkheadThe insulated partition between
the engine and the passenger compartment.
CCaliperThe non-rotating part of a disc-brake
assembly that straddles the disc and carries
the brake pads. The caliper also contains the
hydraulic components that cause the pads to
pinch the disc when the brakes are applied. A
caliper is also a measuring tool that can be set
to measure inside or outside dimensions of an
object.
Brake bleeding
Bearing
Axle assembly
Anti-seize compound
Alternator (exploded view)
Air filter

Glossary of Technical Terms REF•21
REF
CamshaftA rotating shaft on which a series
of cam lobes operate the valve mechanisms.
The camshaft may be driven by gears, by
sprockets and chain or by sprockets and a
belt.
CanisterA container in an evaporative
emission control system; contains activated
charcoal granules to trap vapours from the
fuel system.
CarburettorA device which mixes fuel with
air in the proper proportions to provide a
desired power output from a spark ignition
internal combustion engine.
CastellatedResembling the parapets along
the top of a castle wall. For example, a
castellated balljoint stud nut.
CastorIn wheel alignment, the backward or
forward tilt of the steering axis. Castor is
positive when the steering axis is inclined
rearward at the top.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 clip
DDiagnostic 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.
Castellated nut
Catalytic converter
Crankshaft assembly
Carburettor
Canister
Drum brake assembly
Accessory drivebelts
Driveshaft