DIAGNOSTIC MANUAL
American Trucking Association
(ATA) Datalink
A serial datalink specified by the American Trucking Association and the SAE.
Boost pressure
1. The pressure of the charge air leaving the turbocharger.
2. Inlet manifold pressure that is greater than atmospheric pressure. Obtained by turbocharging.
Bottom Dead Center (BDC)
The lowest position of the piston during the stroke.
Brake Horsepower (bhp)
The power output from an engine, not the indicated horsepower. The power output of an engine,
sometimes-called flywheel horsepower, is less than the indicated horsepower by the amount of friction
horsepower consumed in the engine.
Brake Horsepower (bhp) net
Net brake horsepower is measured with all engine components. The power of an engine when configured
as a fully equipped engine. (SAE J1349 JUN90)
Calibration
ECM programming strategy to solve engine performance equations and make decisions. Calibration
values are stored in ROM and put into the processor during programming to allow the engine to operate
within certain parameters.
Camshaft Position (CMP)
sensor
A magnetic pickup sensor that provides the ECM with a camshaft speed and position signal.
Carbon Monoxide (CO)
A colorless, odorless, highly poisonous gas that is formed by the incomplete combustion of carbon burning
diesel engine. It is present in the exhaust gases of diesel engines.
Catalyst
A substance that produces a chemical reaction without undergoing a chemical change itself.
Catalytic converter
An antipollution device in the exhaust system that contains a catalyst for chemically converting some
pollutants in the exhaust gases (carbon monoxide, unburned hydrocarbons, and oxides of nitrogen) into
harmless compounds.
Charge air
Dense, pressurized, heated air discharged from the turbocharger.
Charge Air Cooler (CAC)
See
Aftercooler
.
Charge Air Outlet Temperature
(CACOT) sensor
A thermistor sensor that monitors the temperature of charge air entering the intake air duct.
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