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M/C
Mixture control or mixture control solenoid.
M/T
Manual Transmission
MAF
Mass Air Flow Sensor
MAF RTN
Mass Airflow Sensor Ground
MAGNETIC FIELD
The portion of space near a magnetic body in which magnetic lines of force exist.
MAGNETIC PICK-UP COIL
Coil used in electronic distributor ignition systems to determine when to switch off the coil secondary.
MAGNETIC RELUCTANCE
The opposition of a magnetic substance to the flow of magnetic flux through it.
MALFUNCTION
A problem which causes a system to operate incorrectly. Typical malfunctions are wiring harness opens or shorts, failed sensors, or circuit components.
MALFUNCTION INDICATOR LIGHT (MIL)
Generic term for various warning lamps used to indicate malfunctions in the vehicle's engine management system (on-board computer and associated input/output devices).
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
A sensor which sends a varying frequency signal (based on manifold vacuum and manifold pressure) to the vehicle's on-board computer for calculation of barometric pressure.
Manufacturer Specific Code
A DTC that applies only to OBD 2 compliant vehicles made by a specific manufacturer.
MAP
Manifold Absolute Pressure sensor or its circuit.
MAS
Mixture Adjust Screw
Mass Air Flow Sensor
Used to measure amount of airflow through the throttle body.
MAT
Manifold Air Temperature.
MC
Mixture Control
MCS
Mixture Control Solenoid (GM)
MCT
Manifold Charge Temperature Sensor (Ford)
MCU
Microprocessor Control Unit (Ford)
MCV
Manifold Control Valve (Ford)
MDP
Manifold Differential Pressure
MECS
Mazda Electronic Control System
MEMCAL
Memory Calibration
MERCURY (Hg)
A material used as a calibration standard for vacuum measurement.
MFI
Multi-port Fuel Injection.
MIC
Mechanical Instrument Cluster
MICROPROCESSOR
A small processor located in the vehicle's computer.
MICROPROCESSOR CONTROL UNIT (MCU)
The controlling computer, used on early Ford feedback carburetor systems and all 5.8L feedback carburetor equipped Fords.
MIL
Malfunction Indicator Lamp (also referred to as "Check Engine" light
MISAR
Microprocessed Sensing and Automatic Regulation (GM)
MIXTURE CONTROL SOLENOID
Device installed on carburetor, that regulates the air/fuel ratio.
MLP
Manual (shift) Lever Position sensor or its circuit.
MLUS
Modulated Lock Up Solenoid or its Control Circuit (Ford)
MLVLPS
Manual Valve Lever Position
MODE
A specific state or condition of operation.
MODULE
A mechanical, electrical or electromechanical arrangement of components intended to perform a specific task (such as ignition). Modules are usually designed to allow easy removal and replacement.
Monitor
Monitors are "diagnostic routines" programmed into the PCM. The PCM utilizes these programs to run diagnostic tests, and to monitor operation of the vehicle's emissions-related components or systems to ensure they are operating correctly and within the vehicle's manufacturer specifications. Currently, up to eleven Monitors are used in OBD 2 systems. Additional Monitors will be added as the OBD 2 system is further developed. Not all vehicles support all eleven Monitors.
Monitor Has/Has Not Run
The terms "Monitor has run" or "Monitor has not run" are used throughout this manual. "Monitor has run," means the PCM has commanded a particular Monitor to perform the required diagnostic testing on a system to ensure the system is operating correctly (within factory specifications). The term "Monitor has not run" means the PCM has not yet commanded a particular Monitor to perform diagnostic testing on its associated part of the emissions system.
MPFI
Multi-Port Fuel Injection
MPG
Miles Per Gallon
MPH
Miles Per Hour
MPI
Multi Port Injection
mS or ms
Millisecond
MSFF
Miles Since First Fail
MSLF
Miles Since Last Fail
MST
Manifold Surface Temperature
MT
Manual Transmission
MTV
Manifold Tune Valve
MULTI-PORT FUEL INJECTION
Individual injectors for each cylinder mounted in intake manifold. Injectors are pulsed in groups rather than individually.
mV or mv
Milivolt
MVLPS
Manual Valve Lever Position
MVZ
Manifold Vacuum Zone
