Emission Control Systems: Description and Operation

The following list contains engine emission control terms and acronyms used by Saturn Corporation. Saturn Service Publications use these terms and acronyms, many of which are similar or identical to former Saturn terms. The list is consistent with the SAE 1930 document. Recommended practice is geared toward standardizing terminology across all automobile manufacturers.

ACRONYM DESCRIPTION

ACL Air Cleaner
ACL Element Air Cleaner Element
AIR Secondary Air Injection
AIR Pump Secondary Air Injection Pump
CL Closed Loop
CKP Sensor Crankshaft Position Sensor
CTP Closed Throttle Plate
DLC Data Link Connector
DTC Diagnostic Trouble Code
ECT Sensor Engine Coolant Temperature Sensor
EEPROM Electronically Erasable Programmable Read Only Memory
EGR Exhaust Gas Recirculation
EI Electronic Ignition
EOP Switch Engine Oil Pressure Switch
EPROM Erasable Read Only Memory
EVAP Purge Solenoid Evaporative Emission Purge Solenoid
EVAP System Evaporative Emission Control System
FP Fuel Pump
FT-LBS Foot-Pounds (measure of pressure)
HO2S-2 Heated Oxygen Sensor 2
IAC Idle Air Control
IAT Sensor Intake Air Temperature Sensor
IC (Ignition Control) Electronic Ignition System
ISC Idle Speed Control
KPA Kilopascals (measure of pressure)
KS Knock Sensor
Long Term FT Long Term Fuel Trim
MAP Sensor Manifold Absolute Pressure Sensor
MIL Malfunction Indicator Lamp
OBD System Check On-Board Diagnostics System Check
OBD II On-Board Diagnostics Generation II
OC Oxidation Catalytic Converter (Pre Converter)
OL Open Loop
O2S-1 Oxygen Sensor 1
PCM Powertrain Control Module
PCV Valve Positive Crankcase Ventilation Valve
PNP Park/Neutral Switch
PSI Pounds per Square Inch
PWM Pulse Width Modulation
RAM Random Access Memory
ROM Read Only Memory
RPM Revolutions per Minute
SFI Sequential Fuel Injection
Short Term FT Short Term Fuel Trim
ST Data Scan Tool Data
TC Transaxle Control
TCC Solenoid Torque Converter Clutch Solenoid
TFT Sensor Transaxle Fluid Temperature Sensor
TP Sensor Throttle Position Sensor
Transaxle ISS Transaxle Input Speed Sensor
Transaxle OSS Transaxle Output Speed Sensor
TWC Three-Way Catalyst (Main Converter)
TWC + OC Three-Way + Oxidation Catalytic Converter (Pre and Main Converter)
VSS Vehicle Speed Sensor
WOT Wide Open Throttle