| Acronym |
Definition |
Notes / What Is / Who Is |
| MACS |
Mobile Air Conditioning Society Worldwide |
Founded in 1981, a non-profit trade association for the
mobile air conditioning, heating and engine cooling system segment of the
automotive aftermarket. |
| MAF |
mass airflow sensor |
Detects the mass air flow in a air intake duct or a intake
manifold. Air flow sensor. Also called AFM or
VAF |
| MAMA |
Midwest Automotive Media Assn. |
Non profit media association formed in 1991 bringing
together journalists and public relations professionals involved in the
automotive industry. |
| MAP |
manifold absolute pressure sensor |
Senses different altitudes of the vehicle. Air entering the
engine is directly proportional to the air density, which is proportional to
the manifold absolute pressure. |
| MAT |
manifold air temperature |
Temperature of the air flow inside the intake manifold. |
| MC |
mixture control |
Air / fuel mixture |
| MDP |
manifold differential pressure |
Tells the ECM how much
pressure is in the intake manifold. |
| MECP |
Mobile Electronics Certification Program |
Certification program that was developed in 1991, by several
12-volt industry volunteers, who wanted to bring a higher level of
professionalism to mobile electronics installation technician career through
a national certification program. |
| MEMA |
Motor and Equipment Manufacturers Association |
Represented parts suppliers since 1904. Serves members
through its three affiliate associations: AASA,
HDMA and OESA |
| MERA |
Mobile Enhancement Retailers Association |
Exists to elevate the success of specialty retailers in the
mobile electronics industry. |
| MFI |
multiport fuel injection |
See MPFI below |
| MIL |
malfunction indicator lamp |
Check engine light on the dash. |
| mm |
millimeters |
Unit of measurement |
| MPFI |
multi port fuel injection |
A fuel injector for each piston of the engine. |
| MPG |
miles per gallon |
How many miles a vehicle can run on one gallon of gas. |
| MPH |
miles per hour |
Speed measurement |
| MPI |
multi port injection |
See MPFI |
| MPMC |
Motorsports Parts Manufacturers Council |
A SEMA council. |
| ms |
millisecond |
Unit of time measurement |
| MSDS |
material safety data sheet |
A form with data regarding the properties of a particular
substance or chemicals toxicity, health effects, first aid, reactivity,
storage, disposal, protective equipment list and spill-handling procedures. |
| MST |
manifold surface temperature |
Intake manifold sensor |
| mV |
millivolts |
Unit of electrical measurement |
