Triumph Rocket III Service Manual page 168

Fuel System/Engine Management
Glossary of Terms
The following terms and abbreviations will be found in
this section. Below is given a brief explanation of
what some of the more common terms and
abbreviations mean.
Air temperature
The air temperature in the air box and intake hose.
Air temperature sensor
Sensor located in the airbox to detect the temperature
of the incoming air.
ATDC
After Top Dead Centre.
Barometric pressure
Pressure of the air in the airbox.
Battery voltage
The voltage at the input to the Electronic Controi
Module (ECM).
BTDC
Before Top Dead Centre (TDC).
Catalyst
Device placed in the exhaust system which reduces
exhaust emissions by stimulating secondary
combustion of the exhaust gases.
Closed throttle position
Throttle position at idle (i.e. against end stop).
measured as a voltage and expressed as percentage.
Coolant temperature
The coolant temperature in the cylinder head.
Coolant temperature sensor
Sensor which detects coolant temperature.
Cooling fan status
The 'on' or 'off' condition of the cooling fan.
DTC
Diagnostic Trouble Code.
ECM
Engine Control Module.
Engine speed
The crankshaft revolutions per minute.
Freeze frame
A data set captured at the time a Diagnostic Trouble
Code (DTC) is set.
Idle fuel trim
The percentage above or below the nominal fuel
requirement for the volume of air entering at idle.
Idle fueling
Adjustment of fueling at idle to suit the actual air
inducted.
Idle reference speed
The target idle speed as determined by the Electronic
Control Module (ECM). (It should be the same as the
actual idle speed if the motorcycle is operating
correctly.)
Ignition advance
The timing of ignition at the spark plug relative to top
dead centre.
Ignition switch position
The 'on' or 'off' position of either or both the ignition
switch and the engine stop switch.
Ignition timing
Same as 'ignition advance'.
Injector pulse time
The time during which an injector remains open (i.e.
delivering fuel).
Long term fuel trim
Fueling after adapting to the engine's long term
fueling requirements (closed loop only). See also
short term fuel trim.
11.14
Service Manual - Rocket
III