Air temperature
The air temperature in the air box and intake system.
Air temperature sensor
Sensor located in the airbox to detect the temperature of the incoming air.
ATDC
After Top Dead Centre (TDC).
Barometric pressure
Pressure of the ambient air.
Battery voltage
The voltage at the input to the Electronic Control 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.
Fall detection
The fall detection switch will detect if the motorcycle is on its side and will cut power to the ECM immediately.
Freeze frame
A data set captured at the time a Diagnostic Trouble Code (DTC) is set.
Gear position sensor
Gearbox mounted sensor which delivers information to the ECM. This is converted to the gear position value that is displayed on the instrument's gear position indicator and/or neutral lamp.
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). (lt should be the same as the actual idle speed if the motorcycle is operating correctly.)
Ignition advance
The timing of the ignition at the spark plug relative to top dead centre (TDC).
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'.
Immobiliser and Tyre Pressure Monitoring System (TPMS) Control Module
The control module for the Immobiliser and TPMS system.
lniector pulse time
The time during which an injector remains open (i.e. delivering fuel).
Lambda 02 Sensor
The Lambda sensor measures the Oxygen levels in the exhaust gases and feeds this information to the ECM. Based on this information, adjustments to air/fuel ratio are made.
Long term fuel trim
Fueling after adapting to the engine's long term fueling requirements (closed loop only). See also short term fuel trim.
MAP sensor
Manifold Absolute Pressure (the air pressure in the intake system). Measured after the throttle valves. This reading is compared to the ambient pressure reading to allow the ECM to calculate engine load.
MIL
Malfunction Indicator Lamp.
Illuminates when most Diagnostic Trouble Codes (DTCs) are set.
Open circuit
A break in an electrical circuit - current cannot flow.
Over temp
High temperature within the Electronic Control Module (ECM) caused by an internal or external failure.
Primary throttle position sensor
Sensor for the primary (lower) throttle position.
Primary throttle stepper motor
Stepper motor used to vary throttle opening at idle and when the engine is cold.
Purge valve duty cycle
The time the purge valve is open in an open/close cycle, expressed as a percentage of the cycle time.
Road speed sensor
Gearbox mounted sensor which delivers information to the ECM. This is converted to the road speed value that is then displayed on the speedometer.
Non ABS models only. ABS models use the rear ABS wheel speed sensor to supply road speed sensor to the ECM.
Sensor supply voltage
Supply voltage to the system sensors (nominally 5 Volts).
Short circuit
A 'short cut' in an electrical circuit - current by-passes the intended circuit (usually to earth).
Short term fuel trim
A correction applied to the fuel mixture during closed loop catalyst operation. This, in turn has an effect on the long term fuel trim in that if an engine constantly requires mixture correction, the long term fuel trim will adapt to this requirement thus reducing the need for constant short term adjustment.
Sidestand status
The 'up' or 'down' position of the side stand.
Target dwell time
The actual time from coil 'on' to coil 'off.
Throttle position
The position of the throttle butterfly given as a percentage of the movement range. When the data is displayed on the diagnostic software, fully open need not be 100% nor fully closed 0%.
Throttle voltage
Voltage at the throttle potentiometer.
TDC
Top Dead Centre.
TPMS
Tyre Pressure Monitoring System.
Transponder
A transmitter-responder chip located in the ignition key. The transponder is activated by a radio signal sent out by the immobiliser and TPMS control module, via an antenna located around the ignition switch. If the immobiliser and TPMS control module 'does not receive the correct code signal from the transponder, the immobiliser will remain active and the engine will not start.
Vbatt
Battery voltage.