GLOSSARY
L
Liters
L4
Four Cylinder Inline Engine
LAB OSCILLOSCOPE
An electronic device used to analyze voltages. The oscilloscope produces a picture of the voltage waveform on a CRT screen.
LAMBSE
Short Term Fuel Trim
LCD
Liquid Crystal Display
LEAN MIXTURE
Air/fuel mixture that has excessive oxygen left after all fuel in combustion chamber has burned, 1 part fuel to 15 or more parts air.
LED
Light Emitting Diode
LFC
Low Fan Control
LFP
Low Speed Fuel Pump Control
LHD
Left Hand Drive
LIGHT-EMITTING DIODE (LED)
A positive/negative junction of crystal which produces light when forward bias current is applied.
LIMP-IN MODE
A condition where the vehicle's on-board computer has detected a faulty or failed input device (switch, sensor, etc) and has substituted a known value for the failed input. When this condition occurs, driveability is greatly affected; but will allow the operator to get the vehicle to a service facility.
LINEAR
A mathematically expressed relationship, the graphical representation of which is a straight line.
LOAD
Calculated Load Value
LOC
Light Off Catalyst
LOCK UP TORQUE CONVERTER
Converter with internal mechanism that locks turbine to impeller when engaged.
LOCK-UP TORQUE CONVERTER SOLENOID
A transaxle-mounted solenoid, operating under control of the vehicle's on-board computer, which engages the torque converter to directly connect the engine to the transaxle.
LOGIC MODULE
A microprocessor (located in the vehicle's on board computer) which receives inputs from the vehicle's engine control system sensors, and generates the output signals to control engine operation an an optimum balance between engine performance, vehicle emissions and fuel economy.
LOGIC PROBE
A device used to verify operation of a logic (on/off) circuit.
Long Term Fuel Trim
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 (long term).
LONGFT
Long Term Fuel Trim
LOOP
Engine Operating Loop Status
LOS
Limited Operating Strategy
LPG
Liquid Petroleum Gas
LSS
Linear Shift Solenoid
LTFT
Long Term Fuel Trim
LTS
Low Coolant Switch
LUS
Lock-Up Solenoid
LV8
Load Variable
LWB
Long Wheel Base