Emission Control Terms

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 geared toward standardizing terminology across all automobile manufacturers.

ACRONYM DESCRIPTION
ACL Air Cleaner
ACL Element Air Cleaner Element
A/C Pressure Sensor Air Conditioning Pressure Sensor
CL Closed Loop
CKP Sensor Crankshaft Position Sensor
CMP Sensor Camshaft Position Sensor
CTP Closed Throttle Plate
DLC Data Link Connector
DTC Diagnostic Trouble Code
EC Engine Control
ECM Engine Control Module
ECT Sensor Engine Coolant Temperature Sensor
EEPROM Electronically Erasable Programmable Read Only Memory
EGR Exhaust Gas Recalculation
EI Electronic Ignition
EOP Switch Engine Oil Pressure Switch
EPROM Erasable Read Only Memory
EVAP Canister Purge Valve Evaporative Emission Canister Purge Valve
EVAP System Evaporative Emission Control System
FC Relay Fan Control Relay
FP Fuel Pump
HO2S Heated Oxygen Sensor
IAT Sensor Intake Air Temperature Sensor
IC (Ignition Control) Electronic Ignition Control System
ISC Idle Speed Control
KS Knock Sensor
Long Term FT Long Term Fuel Trim
MAF Sensor Mass Air Flow Sensor
MAP Sensor Manifold Absolute Pressure Sensor
MIL Malfunction Indicator Lamp
OBD System Check On-Board Diagnostic System Check
OBD II On-Board Diagnostic Generation II
OC Oxidation Catalytic Converter
OL Open Loop
O2S Oxygen Sensor
PCV Valve Positive Crankcase Ventilation Valve
PNP Park/Neutral Switch
PWM Pulse Width Modulation
RAM Random Access Memory
ROM Read Only Memory
RPM Engine Speed
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
TCM Transaxle Control Module
TFT Sensor Transaxle Fluid Temperature Sensor
TP Sensor Throttle Position Sensor
TSS Sensor Turbine Shaft 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
WU-OC Warm Up Oxidation Catalytic Converter
WU-TWC Warm Up Three-Way Catalytic Converter