For 1990-2009 cars

### Diagnostics 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 he SAE 1930 document. Recommended practice is geared toward standardizing terminology across all automobile manufacturers.

ACRONYM | DESCRIPTION
--- | ---
ACL | Air Cleaner
A/C Pressure Sensor | Air Conditioning Pressure Sensor
AIR | Secondary Air Injection
AIR Pump | Secondary Air Injection Pump
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
ECM | Engine Control Module
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 System | Evaporative Emission Control System
FC Relay | Fan Control Relay
FP | Fuel Pump
HO2S | Heated Oxygen Sensor
IAC Valve | Idle Air Control Valve
IAT Sensor | Intake Air Temperature Sensor
IC (Ignition Control) | Electronic Ignition System
ISS | Input Speed Sensor
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 II | On-Board Diagnostics Generation II
OC | Oxidation Catalytic Converter (Pre-Converter)
OL | Open Loop
OSS | Output Speed Sensor
O2S | Oxygen Sensor
PCM | Powertrain Control Module
PCV Valve | Positive Crankcase Ventilation Valve
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
TWC | Three-Way Catalyst (Main Converter)
TWC + OC | Three-Way + Oxidation Catalytic Converter (Pre and Main Converter)
WOT | Wide Open Throttle