Automotive Glossary


Automotive Glossary

Browse the glossary using this index

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P

P/B

Power Bakes
Entry link: P/B

P/N

Park and neutral position switch for sending signals to the PCM.
Entry link: P/N

P/S

Power Steering Pressure Switch. Also PSP switch.
Entry link: P/S

PA

Pressure Air
Entry link: PA

Pace

The relative speed of progress or change.
Entry link: Pace

Paint

A material which, when applied as a liquid to a surface, forms a solid film for the purpose of decoration and/or protection. Generally, any paint contains a binder, solvent, and pigment plus other chemicals or additives giving the paint its special characteristics or properties.
Entry link: Paint

Paint Remover

A chemical, usually a mixture of acid and solvents that breaks down an old paint finish by liquefying it, thus allowing it to be completely removed from the substrate.
Entry link: Paint Remover

Paint Strainer

A disposable fine mesh filter used to clean paint as it is poured into the gun cup.
Entry link: Paint Strainer

Paint thickness gauge

Precision instruments to accurately measure the dried film thickness of painted objects by non-destructive testing. On ferrous substrates, they operate by measuring the resistance to the flow of magnetism between two probes, and on non-ferrous surfaces special gauges use the 'Eddy Current' principle
Entry link: Paint thickness gauge

PAIR

Pulsed Secondary Air Injection
Entry link: PAIR

Pan

Alternative name for a sump.
Entry link: Pan

Panel Lights

Illumination for instruments and other displays.
Entry link: Panel Lights

Panhard Rod

Rear axle transverse link between the chassis and axle beam. It is used to hold the axle in relation to the body during cornering or for sideways forces.
Entry link: Panhard Rod

Paraffin

A petroleum based thin and colourless fuel oil, (kerosene in US English).
Entry link: Paraffin

Parallel

The condition that exists when the centre lines of two or more items or components or lines do not converge. The extended lines in both directions will always remain at an equal distance apart.
Entry link: Parallel

Parallel circuit

A circuit that splits into two or more branches. A break in one will not stop current flowing in the other(s).
Entry link: Parallel circuit

Parallel hybrid

The engine and motor can both be used to drive the vehicle (most hybrid vehicles use this system).
Entry link: Parallel hybrid

Parasitic draw

An unwanted, usually small, current flow from a battery.
Entry link: Parasitic draw

Parking Brake

Mechanical system of braking to hold vehicle stationary.
Entry link: Parking Brake

Parking Gear

The component(s) in an automatic box that lock the drive when 'Park' is selected.
Entry link: Parking Gear

Particle Size

The size of the pigment particles in a dispersion (e.g. paint).
Entry link: Particle Size

Particulates

Exhaust pollution consisting of very small particles of matter (soot) that are produced as a by-product of combustion. Seen as smoke in a vehicle exhaust, particularly from diesel engines.
Entry link: Particulates

PAS

Power Assisted Steering.
Entry link: PAS

Pascal (Pa)

Standard unit of pressure (N/m2) named after a scientist who studied pressure in liquids. Pascal's principle of the transmission of pressure in fluids established that the pressure in a completely filled container is equally applied throughout and any change in pressure is transferred to all parts of the fluid and walls of the container.
Entry link: Pascal (Pa)

Passivation

The conversion of a metal surface to a less reactive state. A process used by vehicle body manufacturers to reduce the corrosion rate of a metal surface, particularly low-carbon steel.
Entry link: Passivation

Passive Restraint

Safety features of a vehicle that act only in an accident. Seat belts, head restraints, air bags and pre-tensioners are examples.
Entry link: Passive Restraint

Password

Personal Identification, used in conjunction with a Smart Card to access the MOT database via the VTS device. Can be numbers or letters, or a combination of both.

Entry link: Password

Pawl

Part of the ratchet mechanism that holds the ratchet. A pivoted tooth that engages in the teeth of the ratchet wheel to either prevent the pawl lever or the wheel from rotating in one direction only or in some mechanisms to drive the wheel forward.
Entry link: Pawl

PCM

Powertrain Control Module.
Entry link: PCM

PCV

Positive Crankcase Ventilation. A series of pipes and valves connecting the engine crankcase to the inlet manifold or air cleaner in order to reduce oil vapour emission to atmosphere.
Entry link: PCV

PDU

Power drive unit
Entry link: PDU

Pearls (Pearlescents)

Finishes which include mica flakes in addition to the pigment and binder. These finishes are highly decorative and often give the impression that the colour alters as the viewing angle is changed.
Entry link: Pearls (Pearlescents)

PECV

Power Enrichment Control Valve
Entry link: PECV

Peeling

The failure of a paint film to adhere to its substrate. Peeling results when contaminated surfaces are painted, when there is an excessive difference between paint and surface polarity or thermal expansion, or when there is solvent incompatibility.
Entry link: Peeling

Pentagon

The Pentagon, is a government building with five sides that serves as the headquarters of the United States Department of Defence. A pentagon, is a five sided shape.
Entry link: Pentagon

Percent

The proportion of one part of something to the whole. Usually out of 100 (‘per' means ‘out of' and ‘cent' means ‘hundred').
Entry link: Percent

Percentage Change

Changed amounts divided by the original value, then multiplied by 100.
Entry link: Percentage Change

Perceptual Safety

A reference to how safe the driver and passengers feel.
Entry link: Perceptual Safety

Perimeter

The sum of all the outside edges of a shape.
Entry link: Perimeter

Perishing

Description of how some components, particularly if rubber-based, can decay.
Entry link: Perishing

Perpendicular

At ninety degrees to another plane or line.
Entry link: Perpendicular

Petrol

Volatile hydrocarbon fuel for spark ignition engines. Also gasoline.
Entry link: Petrol

Petroleum Jelly

A type of grease used for battery terminals. Vaseline is a refined version.
Entry link: Petroleum Jelly

Pferdestärke

The German word for horsepower. Pferdestärke. 1PS equals 0.986bhp.
Entry link: Pferdestärke

PFI

Port Fuel Injection.
Entry link: PFI

PG

Pulse Generator.
Entry link: PG

PH value

A measure of the acidity of a substance in an aqueous solution. Pure water has a pH value of 7 and is classified as neutral. Below 7 is acid and above 7 is known as basic. The scale is from 0 (strong acid) to 14 (strong base).
Entry link: PH value

Phase

The time span between the start and end of a single wave moving from zero to positive and negative positions and returning to zero.
Entry link: Phase

Phase Sensor

Sensor that indicates camshaft position and hence where the engine is in its cycle.
Entry link: Phase Sensor

Phasing (diesel injection)

There are a number of phases of injection: fill phase, spill phase, injection phase and the pressure reduction phase.
Entry link: Phasing (diesel injection)

Phosfor Bronze

See Phosphor Bronze.
Entry link: Phosfor Bronze

Phosphating

A process used by vehicle body manufacturers which results in the formation of a layer of zinc, iron, or manganese phosphate crystals on the surface of the part to be painted. In modern vehicle construction plants, phosphating is achieved by complete body immersion.
Entry link: Phosphating

Phosphor bronze

A material that can absorb oil making it ideal for making bushes/bearings.
Entry link: Phosphor bronze

Phosphoric Acid

An acid commonly used as a catalyst to speed up the cure of Etch primers and some baking finishes, usually alkyd/nitrogen resin combinations. Also a cleaner used for removing surface corrosion from ferrous metals.
Entry link: Phosphoric Acid

Photoelectric

The generation of an electrical current by light shining on certain materials such as some semiconductor devices. Photoelectric cell, photodiode or phototransistor.
Entry link: Photoelectric

Phototransistor

A transistor that is operated by light.
Entry link: Phototransistor

Phrase

A group of words in sequence.
Entry link: Phrase

Physical layer

Hardware, actual components and wires as opposed to software.
Entry link: Physical layer

Pi

3.141592 (3.142).
Entry link: Pi

Pick Up Pipe

Oil pipe that picks up oil from the oil pan.
Entry link: Pick Up Pipe

Pickling

The use of a chemical solution (usually acidic) to prepare a surface for painting or bonding by dissolving away surface oxides and other impurities.
Entry link: Pickling

PID

Parameter ID
Entry link: PID

Piezo-resistive

A special crystal that changes resistance as pressure is applied.
Entry link: Piezo-resistive

Piezoelectric

Voltage produced by shock waves on a piezo crystal. Used in engine knock sensors.
Entry link: Piezoelectric

Pigment

Small particles added to paint to influence properties such as colour, corrosion resistance, mechanical strength, etc. Pigments may be coloured, semi-transparent, black, white, or colourless. They must be incorporated into a paint system by very efficient dispersion processes.
Entry link: Pigment

Pilot Bearing

Small bearing usually where two shafts meet. See also Spigot.
Entry link: Pilot Bearing

Pinging

Noise heard from an engine when the ignition of fuel occurs too early (advanced) in the cycle. Also 'ping'.
Entry link: Pinging

Pinholing

A defect consisting of tiny holes in the dried paint surface. Defects such as pin holing, popping, bubbling, and cratering are usually caused by solvent vapours forming from the substrate or the paint and rising to the surface.
Entry link: Pinholing

Pinion

A small gear wheel or the driver of a meshing pair of gear wheels.
Entry link: Pinion

Pinion Gear

A small gear wheel or the driver of a meshing pair of gear wheels.
Entry link: Pinion Gear

Pinion Shaft

A shaft on which a small gear runs.
Entry link: Pinion Shaft

Pinking

Noise heard from an engine when the ignition of fuel occurs too early (advanced) in the cycle. Also 'ping'.
Entry link: Pinking

Pintaux

Type of injector for an indirect injection engine. Similar to pintle but with additional small injection orifice for low engine speeds.
Entry link: Pintaux

Pintle

Type of injector for an indirect injection engine. Uses a spring-loaded needle that is raised by fuel pressure to allow a spray of fuel to enter the pre-combustion chamber.
Entry link: Pintle

PIP

Profile Ignition Pick Up Signal.
Entry link: PIP

Pipe Union

A joint in a pipe.
Entry link: Pipe Union

Piston

Reciprocating component, usually in the form of a cylinder closed at one end, that operates under fluid pressure within a smooth walled cylinder. In a reciprocating engine, gas pressure on the piston crown provides the prime force that is converted into rotating mechanical power by the crankshaft.
Entry link: Piston

Piston Blow

Term used to describe gases blowing past the piston rings.
Entry link: Piston Blow

Piston Crown

The top of the piston.
Entry link: Piston Crown

Piston Ring

Sealing rings usually made of cast iron. Fitted on to a piston to make a gas tight seal.
Entry link: Piston Ring

Pitch

(1) Distance that two points are apart. Examples are thread dimensions and pitch circle diameters of concentric drillings. (2) Vehicle body movement from back to front or from front to back.
Entry link: Pitch

Pitman Arm

The output arm on a steering gearbox. Also known as a drop arm.
Entry link: Pitman Arm

Pitting

The appearance of holes or pits in a paint film while it is wet. May also refer to the damage caused by more serious rusting on steel panelwork
Entry link: Pitting

Pivot Bolt

A simple bolt on which something pivots (turns).
Entry link: Pivot Bolt

Pivot Point

The point about which something pivots!
Entry link: Pivot Point

Planet Carrier

Frame with spindles that the planet gears rotate on as part of an epicyclic gear set.
Entry link: Planet Carrier

Planetary Gears

Gears that rotate around sun gears (differential, epicyclic gearing, etc.)
Entry link: Planetary Gears

Planning

The act of forming and following a program to achieve a specific goal.
Entry link: Planning

Planometer

A flat metal plate for gauging the accuracy of a plane surface in precision metalworking, which is also known as a surface plate
Entry link: Planometer

Plastic Filler

A compound of resin and heavy pigments used to fill dents on car bodies.
Entry link: Plastic Filler

Plasticizer

A low molecular weight substance added to polymeric materials such as paints to improve their flexibility.
Entry link: Plasticizer

Plastigauge

Brand name of a product that is used to determine bearing clearance.
Entry link: Plastigauge

Plate Grids

Basket like holders to contain the active material in a battery.
Entry link: Plate Grids

Plate Lug

A connection point on the battery plate.
Entry link: Plate Lug

Plenum

A chamber in the air inlet system to provide even air supply to all cylinders.
Entry link: Plenum

Plies

Rayon cords used in tyre construction.
Entry link: Plies

Plug Thread

Screwed thread that is designed for a spark plug.
Entry link: Plug Thread

Plunge Joint

A shaft joint or coupling with provision for axial or plunging movement.
Entry link: Plunge Joint

Plunger

Alternative term for a piston or needle in a pump, slave cylinder or injector.
Entry link: Plunger

Ply (Tire)

Fabric layer used in the construction of a tire.
Entry link: Ply (Tire)

Ply (Tyre)

Fabric layer used in the construction of a tyre.
Entry link: Ply (Tyre)

Ply Rating

Load rating of a tyre.
Entry link: Ply Rating

Pneumatic

Transfer of force by air or gas.
Entry link: Pneumatic

Pneumatic Suspension

Suspension system using air or gas springs.
Entry link: Pneumatic Suspension

PNP

Park/Neutral Switch
Entry link: PNP

Podger

A tool in the form of a short bar, usually tapered and often incorporating a spanner/wrench at one end.
Entry link: Podger

Points

The switching contacts of an ignition contact breaker.
Entry link: Points

Polarised Light

Light that has been filtered so that its rays oscillate only in one direction.
Entry link: Polarised Light

Polarity

A description of a component that must have positive and negative connections connected correctly.
Entry link: Polarity

Polarity (Electrical)

Electrical positive and negative charges.
Entry link: Polarity (Electrical)

Polarity (Magnetic)

Magnetic north and south poles.
Entry link: Polarity (Magnetic)

Polarized Light

Light that has been filtered so that its rays oscillate only in one direction.
Entry link: Polarized Light

Pole

The ends of a magnet where the field lines are emitted.
Entry link: Pole

Polish

A specially formulated blend of components designed to remove minor paint surface imperfections, such as fine scratches, light oxidation, water spots, and swirl marks left by the use of rubbing compounds.
Entry link: Polish

Polishing

The use of polishes, either by hand or machine, to level and provide more gloss to a finish.
Entry link: Polishing

Polishing Compound

A mild abrasive material applied to a vehicle's painted surface which removes minor imperfections with minimal cutting action. Buffing restores film to a high gloss appearance.
Entry link: Polishing Compound

Polishing Wax

A combination of wax and polish that contains mild abrasives. The abrasives remove minor paint imperfections. The wax and other ingredients produce a durable, high-gloss finish.
Entry link: Polishing Wax

Pollution

Products or by-products that destroy purity or make environments foul or filthy.
Entry link: Pollution

Polyester

A 2K resin used as the binder for plastic fillers, fibre glass laminations and high-build primers
Entry link: Polyester

Polyester Stopper

A finer grade 2K plastic filler material used to fill minor imperfections such as pinholes in filler prior to priming.
Entry link: Polyester Stopper

Polymers

A naturally occurring or synthetic compound consisting of large molecules. Used for many purposes, one of which is as a polish.
Entry link: Polymers

Polypropylene

Manmade plastic material used for electrical insulation, bumpers and other trim components.
Entry link: Polypropylene

Polyurethane

A 1K or 2K plastic-based paint finish that is characterised by durability and high gloss. Also, used for manufacturing some plastic and flexible parts.
Entry link: Polyurethane

Poppet Valve

Conventional inlet and exhaust valves having a circular plate at right angles to a central stem that runs through a guide tube.
Entry link: Poppet Valve

Popping

A paint defect characterized by raised domes in the surface caused by solvent vapour forming within the paint after it has begun to "skin over." Often caused by baking at too high a temperature or before adequate flash-off time has been allowed.
Entry link: Popping

Population of UK

Number of people that live in the UK.
Entry link: Population of UK

Porosity

Property of a material that allows fluid to soak into or through it.
Entry link: Porosity

Port

Hole or aperture shaped to facilitate the flow of gas or liquid into or from a chamber. Usually denoted by its function, as inlet port or exhaust port.
Entry link: Port

Port Fuel Injection

Petrol electronic fuel injection system with injectors in each inlet manifold spraying fuel in towards the inlet valves in the ports of each cylinder. Also known as multipoint injection.
Entry link: Port Fuel Injection

Portfolio

This is usually a folder that contains the evidence chosen to illustrate competence to satisfy individual key skills requirements.
Entry link: Portfolio

Position Switch

A switch used to feedback position of a moving component.
Entry link: Position Switch

Positive Camber

Steering geometry where the road wheel leans outward at the top.
Entry link: Positive Camber

Positive Castor

Angle in side elevation between the steering and vertical axis. Steering axis hits the ground in front of the vertical axis.
Entry link: Positive Castor

Positive Communication

A comment or statement expressing approval.
Entry link: Positive Communication

Positive Crankcase Ventilation

A series of pipes and valves connecting the engine crankcase to the inlet manifold or air cleaner in order to reduce oil vapour emission to atmosphere.
Entry link: Positive Crankcase Ventilation

Positive Displacement

A term applied to pumps which transfer liquid in the same quantity as the volume in the pumping chamber for each action of the pump.
Entry link: Positive Displacement

Positive Offset (Wheel)

The position of the wheel nave or disc when outside the centre line of the wheel.
Entry link: Positive Offset (Wheel)

Positive Scrub

Positive scrub radius steering geometry where a line through the steering swivel axis meets the road surface inside of the tyre centre line.
Entry link: Positive Scrub

Positive Temperature Coefficient

Type of resistor that has resistance increasing with increases in temperature. The normal response for metal conductors. These resistors are used in electrical circuits to give temperature sensing and control.
Entry link: Positive Temperature Coefficient

Potential

Energy stored in a stationary object or chemical combination that has the capacity to do work.
Entry link: Potential

Potential Difference

Difference of electric potential between points (pd) volts.
Entry link: Potential Difference

Potentiometer

A variable resistor with manual operation that provides an output voltage from a sliding terminal on a resistor block.
Entry link: Potentiometer

Pounds Feet

Old unit of torque. Also foot pounds. Torque is now given in the SI units of Newton metres Nm.
Entry link: Pounds Feet

Pour Point

Applied to fuel oils (diesel) to indicate the temperature where it will still flow under its own weight. The pour point specified value is 3 degrees above the point where it will only just flow.
Entry link: Pour Point

Powder Coatings

Any protective coating which is applied to the surface as a dry, finely ground powder and then carefully heated above its melting point so that the powder particles flow together to form a continuous film.
Entry link: Powder Coatings

Power

The rate of doing work. It is measured by the standard unit called the watt (W) and is equal to one joule per second. This is a very small unit and kilowatt (kW) or megawatt (MW) is more often used. Also, Horsepower which is the old term for power.
Entry link: Power

Power Assisted Steering

The use of a hydraulic or electrical system to increase the driver's effort on the steering wheel thus reducing the effort that the driver has to apply.
Entry link: Power Assisted Steering

Power Booster

Hydraulic or pneumatic brake pedal or hydraulic pressure booster.
Entry link: Power Booster

Power Distribution

A central point from which various components are supplied.
Entry link: Power Distribution

Power Output

Power developed by an engine.
Entry link: Power Output

Power split hybrid

A combination of a series and parallel hybrid that uses a mechanical splitting device.
Entry link: Power split hybrid

Power Stroke

Part of the four-stroke cycle following combustion.
Entry link: Power Stroke

Powertrain

Term used to describe the engine, transmission and driveline components as a unit.
Entry link: Powertrain

PPE

Personal protective equipment
Entry link: PPE

PPM

Parts Per Million
Entry link: PPM

Pre-ignition

Spontaneous ignition in a petrol engine that occurs before the controlled ignition point. Can be caused by an overheated engine, incandescent particles in the combustion chamber or incorrect fuel.
Entry link: Pre-ignition

Preignition

Spontaneous ignition in a petrol engine that occurs before the controlled ignition point. Can be caused by an overheated engine, incandescent particles in the combustion chamber or incorrect fuel.
Entry link: Preignition

Preload

Additional tightening of a bearing or component after the backlash or free play has been eliminated. Used to eliminate backlash after the bearings have bedded in. Usually set by a Nm or angular torque.
Entry link: Preload

Presentation

The way in which something is displayed.
Entry link: Presentation

Pressure

Pressure is the product of a force multiplied by the area on which the force is applied. The standard unit of pressure is the Pascal which is equivalent to one N/m2.
Entry link: Pressure

Pressure Bleeder

A brake/clutch bleeder that forces fluid through the system.
Entry link: Pressure Bleeder

Pressure Cap

Cap used to pressurise cooling system.
Entry link: Pressure Cap

Pressure Chamber

An area used to hold a pressure as something expands of to supply pressure.
Entry link: Pressure Chamber

Pressure Charged

An engine using a pressure-charger to boost the air charging pressure above atmospheric pressure, to increase the air mass entering the cylinders of the engine.
Entry link: Pressure Charged

Pressure Conscious

Variable opening valve used for sensing and adjusting the pressure in brake circuits to restrict force to the rear brakes.
Entry link: Pressure Conscious

Pressure Differential

The difference in pressures between two sides of a component or areas in a system that are used to operate the component or system. Atmospheric pressure is often used in conjunction with a vacuum to provide a force.
Entry link: Pressure Differential

Pressure Gauge

An instrument for measuring pressure of a fluid or a gas.
Entry link: Pressure Gauge

Pressure Modulator

A device for controlling pressure in a system.
Entry link: Pressure Modulator

Pressure Plate

Component of the clutch.
Entry link: Pressure Plate

Pressure Regulator

A valve in a hydraulic system that controls line pressure.
Entry link: Pressure Regulator

Pressure Relief Valve

The valve in an oil or hydraulic circuit that opens to release excess fluid pressure and return fluid to the feed side of the pump.
Entry link: Pressure Relief Valve

Pressure Switch

A pressure sensitive switch used to provide a signal voltage to an instrument, lamp or electronic control module.
Entry link: Pressure Switch

Pressure Wave Supercharger

A supercharger using the exhaust pressure waves to boost the inlet air pressure. This supercharger uses a drum with longitudinal drillings that is rotated in time with the engine and ported to match inlet and exhaust pressure waves together.
Entry link: Pressure Wave Supercharger

Pressure-feed Gun

A spray gun equipped with a separate paint container that is pressurized and connected to the spray gun by means of a solvent-resistant fluid hose, in addition to the normal air hose.
Entry link: Pressure-feed Gun

Primary Shoe

A brake shoe that has a leading edge making first contact when applied. Also leading shoe.
Entry link: Primary Shoe

Primary Winding

The low tension (primary circuit) coil of wire in an ignition coil.
Entry link: Primary Winding

Primer

The first coat of paint applied to a substrate. Depending on the formulation of a particular primer, its function can be to provide any combination of">adhesion, build, scratch-filling, ground coating and corrosion resistance.
Entry link: Primer

Primer-sealer

An undercoat which improves adhesion of the topcoat, by sealing off old painted surfaces that have been sanded; usually does not require sanding when dry.
Entry link: Primer-sealer

Priming

Lifting fuel into the system components to remove air.
Entry link: Priming

Priming Pump

A manually operated pump that lifts fuel into the system.
Entry link: Priming Pump

Printer

An output device that allows data from the computer to be displayed on paper.
Entry link: Printer

Processor

The central processing unit oversees all of the other components of the system. Can be thought of as the brain of the computer.
Entry link: Processor

Progression

Initial acceleration of the throttle after the idle position. Going onward/upward.
Entry link: Progression

Progressive Carburettor

Usually a carburettor with two chokes, the second of which only opens as the throttle is pushed further down.
Entry link: Progressive Carburettor

PROM

Programmable Read Only Memory.
Entry link: PROM

Propeller Shaft

Connects gearbox to final drive and transmits torque on rear wheel and four wheel drive vehicles.
Entry link: Propeller Shaft

Propellor Shaft

See Propeller Shaft.
Entry link: Propellor Shaft

Proportion

The relation of one thing to another.
Entry link: Proportion

Proportioner Valve

A valve used in hydraulic brake circuits to split the force between the front and rear brake circuits.
Entry link: Proportioner Valve

Propshaft

Connects gearbox to final drive and transmits torque on rear wheel and four wheel drive vehicles.
Entry link: Propshaft

Propshaft Joints

Universal joints used to allow a propshaft to work through an angle.
Entry link: Propshaft Joints

Propulsion

Application of a driving force.
Entry link: Propulsion

Proton

One of a number of particles in the nucleus of an atom. The proton has a positive polarity and is electrically positive in opposition to the negative charge of the electrons.
Entry link: Proton

Prototype

A working version of a new design.
Entry link: Prototype

Provenance

The origins of information.
Entry link: Provenance

PS

The German word for horsepower. Pferdestärke. 1PS equals 0.986bhp.
Entry link: PS

Psi

Pound per square inch. A measure of pressure in old units. The SI unit of pressure is the Pascal (Pa).
Entry link: Psi

PSP

Power Steering Pressure
Entry link: PSP

PSPS

Power Steering Pressure Switch.
Entry link: PSPS

PT

Part Throttle.
Entry link: PT

PTC

Pending Trouble Code
Entry link: PTC

PTO - Power Take Off

A supplementary drive from a vehicle transmission that is used to drive to auxiliary units.
Entry link: PTO - Power Take Off

Pull-in Winding

A winding in a starter motor solenoid that actuates the solenoid to pull the switch contacts together. It is often earthed through the armature so that the drive pinion rotates as it moves into mesh with starter ring gear.
Entry link: Pull-in Winding

Pull-off Spring

A simple return spring to open or close something after it is switched off.
Entry link: Pull-off Spring

Puller

A tool for applying a pulling force. For example, to remove a gear from a shaft.
Entry link: Puller

Pulleys

Used to transmit or receive drive from a belt. The alternator pulley is a good example.
Entry link: Pulleys

Pulsation

On/off or increase/decrease in pressure or position.
Entry link: Pulsation

Pulsation Damper

Any device, such as a hydraulic accumulator, for damping pulsations in a fluid system, as for example the pressure pulses from a fuel pump.
Entry link: Pulsation Damper

Pulse

A change in electrical or mechanical signal.
Entry link: Pulse

Pulse Air Injection

An emission control system that uses exhaust pressure pulsations to draw air into the exhaust gas flow to increase the available oxygen in the catalytic converter.
Entry link: Pulse Air Injection

Pulse Generator

Inductive electronic device that provides information to the ignition amplifier or ECU on engine position.
Entry link: Pulse Generator

Pulse Shaping

The action carried out in an ECU to a signal from a sensor. For example, a sine wave may be changed to a square wave.
Entry link: Pulse Shaping

Pulse Wheel

Toothed sensor wheel used to induce or affect electrical currents in magnetic inductive pulse generators, such as engine speed and position sensors.
Entry link: Pulse Wheel

Pulse Width

The operating phase of an actuator when it is energised by an electronic control unit.
Entry link: Pulse Width

Pump

Device that is electrically or mechanically driven to pressurize a fluid or gas.
Entry link: Pump

Punctuation

The use of marks and signs to form words, sentences, paragraphs etc.
Entry link: Punctuation

Purge Valve

The valve in a fuel vapour evaporative system operated from the ECM under specific conditions to draw air back through the evaporative canister. An emission control device to prevent hydrocarbon fuel vapours from the fuel tank escaping into the atmosphere.
Entry link: Purge Valve

Push Fit

The relationship between the dimensions of two components where one fits inside the other. In this instance the fit is one where the inner dimension of the outer component is the same as the outer dimension of the inner component. Also known as a transition fit.
Entry link: Push Fit

Push Rod

A rod that transfers movement from a cam follower to a rocker arm.
Entry link: Push Rod

PWR

Power to Weight Ratio
Entry link: PWR

Pyrotechnic

Explosive devices!
Entry link: Pyrotechnic

Pyrotechnic Inflater

An explosive device used to produce a large quantity of gas to inflate an air bag.
Entry link: Pyrotechnic Inflater


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