581
Ambient air pressure
Pressure of the air in the airbox.
ATDC
After Top Dead Centre.
BBDC
Before Bottom Dead Centre.
BDC
Bottom Dead Centre.
BTDC
Before Top Dead Centre (TDC).
Battery Voltage
The voltage at the input to the Engine Electronic Control Module (ECM).
Catalytic converter
Device placed in the exhaust system which converts toxic gases and pollutants in exhaust
gas into less-toxic pollutants by an oxidation and a reduction reaction.
Closed throttle position
Throttle position at idle, measured as a voltage and expressed as a percentage.
Coolant temperature
The coolant temperature in the cylinder head.