If you have discussed Fiero's with other Fiero nuts, you've probably noticed
that a lot of abbreviations were used. Here is a list and a short explanation
of the most commonly used abbreviations.
ALDL
Assembly
Line
Diagnostic
Link.
Used at assembly to evaluate Computer Command Control, and for service to flash the
"Service Engine Soon" or "Check Engine" light if there are trouble codes. It's also used
by "Scan tools" to obtain ECM serial data.
C/L
Closed
Loop
Describes ECM fuel control when using oxygen sensor information.
CTS
Coolant
Temperature
Sensor
Device that senses the engine coolant temperature, and passes that information to the
Engine Control Module.
DIS
Direct
Ignition
System
Produces the ignition spark without the aid of an ignition distributor.
ECM
Engine
Control
Module
A metal case (located in passenger compartment) containing electronic circuitry
which electrically controls and monitors air/fuel and emission systems on
computer command control and turns "ON" the "Service Engine Soon" or
"Check Engine" light when a malfunction occurs in the system.
EFI
Electronic
Fuel
Injection
Computer Command Control using throttle body fuel injection.
EGR
Exhaust
Gas
Recirculation
Method of reducing NOx emission levels by causing exhaust gas to be
added to air/fuel mixture in combustion chamber, thus cooling combustion.
IAC
Idle
Air
Control
A valve installed in the throttle body of fuel injected systems and controlled
by the ECM to regulate idle speed.
ISC
Idle
Speed
Control
Regulates throttle valve position to control idle speed. Idle speed is
controlled by the ECM and is not adjustable.
MAP
Manifold
Absolute
Pressure (Sensor)
Reads pressure changes in intake manifold with reference to zero pressure.
It puts out a voltage which is highest when the pressure is highest.
The maximum voltage is between 4 and 5 Volts.
MAT
Manifold
Air
Temperature (Sensor)
Measures temperature of air in the intake manifold.
MFI
Multiport
Fuel
Injection
Individual injectors for each cylinder are mounted in the intake manifold.
The injectors are fired in groups rather than individually.
M/C
Mixture
Control (Solenoid)
Device, installed in carburator, to regulate the air/fuel ratio.
O/L
Open
Loop
Describes ECM fuel control without use of oxygen sensor information.
TBI
Throttle
Body
Injection (Unit)
Unit, controlled by ECM to supply precise air/fuel mixture into the intake manifold.
TPS
Throttle
Postion
Sensor
Device that tells the ECM the throttle position.
VIN
Vehicle
Identification
Number
Registration number that uniquely identifies a vehicle.
VSS
Vehicle
Speed
Sensor
Sensor which sends vehicle speed information (pulses per mile) to the ECM.