Glossary
GLOSSARY OF TERMS AND ABBREVIATIONS
84 3040c
Manufacturer Specific Code – A DTC that applies only to OBD2
compliant vehicles made by a specific manufacturer.
MIL – Malfunction Indicator Lamp (also referred to as “Check Engine”
light
OBD1 – On-Board Diagnostics Version 1 (also referred to as “OBD I”)
OBD2 – 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.
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
driving condition to enable a vehicle Monitor to run and complete its
diagnostic testing.
VECI – Vehicle Emission Control Information Decal
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