Emission System Abbreviations
Emission Systems Abbreviations
The following are a list of abbreviations used when discussing Toyota Emission Control Systems.
General
AAP - Auxiliary Acceleration Pump.
AI - Air Injection.
AS - Air Suction.
ASV - Air Switching Valve.
BDC - Bottom Dead Center.
BTDC - Before Top Dead Center.
BVSV - Bimetal Vacuum Switching Valve.
CB - Choke Breaker.
CCo - Catalytic Converter for Oxidation.
CCro - Catalytic Converter for Reduction and Oxidation.
CLD - Chemi-Luminescence Detector.
CMH - Cold Mixture Heater.
CVS - Constant-Volume Sampler.
DP - Dash Pot.
EBCV - Electric Bleed Control Valve.
EEC - European Economic Community.
ECS - Emission Control System.
ECU - Electronic Control Unit (Computer).
EGR - Exhaust Gas Recirculation.
EVAP - Evaporative (Emission Control) System.
EX - Exhaust.
FID - Flame Ionization Detector.
GVW - Gross Vehicle Weight.
HAC - High Altitude Compensation.
HAI - Hot Air Intake.
HIC - Hot Idle Compensation.
IG - Ignition.
ITCV - Intake Air Temperature Compensating Valve.
MC - Mixture Control.
NDIR - Non-Dispersive Infared.
OC - Oxidation Catalyst.
OVCV - Outer Vent Control Valve.
PCV - Positive Crankcase Ventilation.
PPM - Parts Per Million.
SC - Spark Control.
SW - Switch.
TDC - Top Dead Center.
TP - Throttle Positioner.
TVSV - Thermostatic Vacuum Switching Valve.
TWC - Three-Way Catalyst.
TWC-OC - Three-Way Catalyst and Oxidation Catalyst.
VCV - Vacuum Control Valve.
VSV - Vacuum Switching Valve.
VTV - Vacuum Transmitting Valve.
w/ - With.
w/o - Without.
Chemical Symbols
Ar - Argon.
C - Carbon.
C8H18 - Octane (Petrol).
CO - Carbon Monoxide.
C02 - Carbon Dioxide.
H - Hydrogen.
HC - Hydrocarbon.
H2O - Water.
N2 - Nitrogen.
NOx - Oxides of Nitrogen (NO, NO2, N2O, N2O3 etc).
O2 - Oxygen.
O3 - Ozone.
Pb - Lead.
S - Sulfur.
SO2 - Sulfur Dioxide.
Article by Medicine_Man
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