Abbreviations and Symbols

Across flats (bolt size) AF
After bottom dead center ABDC
After top dead center ATDC
Alternating current a.c.
Ampere amp
Ampere hour amp hr
Anti-lock Braking System ABS
Automatic Auto
Before bottom dead center BBDC
Before top dead center BTDC
Body Electrical Control Module BeCM
Bottom dead center BDC
Brake horse power bhp
British Standards BS
Camshaft Position Sensor CMP sensor
Carbon monoxide Co
Centigrade (Celsius) C
Centimeter cm
Crankshaft Position Sensor CKP Sensor
Cubic centimeter cm3
Cubic inch in3
Degree (angle) deg or °
Degree (temperature) deg or °
Digital Diesel Electronics DDE
Direct-current d.c.
Direct Ignition System DIS
Electronic Air Suspension EAS
Electronic Control Unit ECU
Electronic Fuel Injection EFI
Electronic Traction Control ETC
Engine Control Module ECM
Engine Coolant Temperature Sensor ECT Sensor
Engine Fuel Temperature Sensor EFT Sensor
Engine Management System EMS
Fahrenheit F
Feet ft
Feet per minute ft/min
Fluid ounce fl oz
Foot pounds (torque) ft. lbs.
Fourth 4th
Fuel Injection Pump FIP
Gramme (force) gf
Gramme (mass) g
Gallons gal
Gallons (US) US gal
Heated oxygen sensor Ho2S
High HI
High tension (electrical) H.T.
Hydrocarbons HC
Hydrofluorocarbon HFC
Idle Air Control IAC
Inches of mercury in. Hg
Inches inch
Inertia-fuel Shut Off Switch IFS Switch
Intake Air Temperature Sensor IAT Sensor
Internal diameter I.D.
Kilogram (force) kgf
Kilogram (mass.) kg
Kilogram centimeter (torque) kgf/cm
Kilogram per square millimeter kgf/mm2
Kilogram per square centimeter kgf/cm2
Kilogram meters (torque) kgf/m
Kilometers Km
Kilometers per hour km/h
Kilowatts Kw
Kilovolts Kv
Left-hand LH
Left-hand Drive LHD
Left-hand thread LHThd
Light Emiting Diode LED
Liter liter
Liquid Crystal Display LCD
Low LO
Low-tension l.t.
Malfunction Indicator Light MIL
Manifold Absolute Pressure Sensor MAP Sensor
Mass Air Flow Sensor MAP Sensor
Maximum max.
Metre m
Milliliter ml
Millimeter mm
Miles per gallon m.p.g.
Miles per hour mph
Minus (of tolerance) -
Minimum MIN
Minute (angle) '
Multiport Fuel Injection MFI
Negative (electrical) -
Negative Temperature Coefficient NTC
Newton meters (torque) Nm
Non-Return Valve NRV
Number No.
Ohms ohm
Ounces (force) ozf
Ounces (mass) oz
Ounce inch (torque) ozf.in.
Outside diameter O.D.
Oxides of Nitrogen NOx
Part number Part No.
Percentage %
Pints pt
Pints (US) US pt
Plus or Minus ±
Plus (tolerance) +
Positive (electrical) +
Pound (force) lbs.
Pounds inch (torque) in. lbs.
Pound (mass) lbs.
Pounds per square inch P.S.I.
Pounds per square inch lbs/in2
Power Assisted Steering PAS
Pressure Conscious Reducing Valve PCRV
Ratio :
Reference ref.
Revolution per minute rpm
Right-hand RH
Right-hand Drive RHD
Second (angle) "
Second (numerical order) 2nd
Specific gravity sp.gr.
Square centimeters cm2
Square inches in2
Standard wire gauge s.w.g.
Supplementary Restraint System SRS
Synchronizer/Synchromesh synchro.
Third 3rd
Top dead center TDC
Thermostatic Expansion Valve TXV
Throttle Position Sensor TP Sensor
United Kingdom UK
Vehicle Identification Number VIN
Volts V
Watts W

SCREW THREADS
American Standard Taper Pipe NPTF
British Standard Pipe BSP
Unified Coarse UNC
Unified Fine UNF