Equus 3120 - OBD 2&1 Tool Kit - Manual (Page 85)

OBD2 & 1 83
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Glossary
GLOSSARY OF TERMS AND ABBREVIATIONS
OBD 2 – On-Board Diagnostics Version 2 (also referred to as “OBD II”)
On-Board Computer – The central processing unit in the vehicle’s
computer control system.
PCM – Powertrain Control Module
Pending Code – A code recorded on the “first trip” for a “two-trip”
code. If the fault that caused the code to be set is not detected on the
second trip, the code is automatically erased.
PID – Parameter Identification
STFT – Short Term Fuel Trim, is a program in the vehicle’s computer
designed to add or subtract fuel from the vehicle to compensate for
operating conditions that vary from the ideal A/F ratio. The vehicle uses
this program to make minor fuel adjustments (fine tune) on a short-
term basis.
Trip Drive Cycle – Vehicle operation that provides the necessary driv-
ing condition to enable a vehicle Monitor to run and complete its diag-
nostic testing.
VECI – Vehicle Emission Control Information Decal