CAMSHAFT 3327299 - Caterpillar

Actual RackThe ECM's interpretation of the signal from the Rack Position Sensor which represents actual position of the rack.Actual Timing AdvanceDegrees of advance beyond static, as measured by the Timing Position Sensor (assumes that Timing Position Sensor is calibrated).After Market DeviceA device or accessory installed by the customer after the vehicle is delivered.Air-To-Air Aftercooler (ATAAC)A means of cooling intake air after the turbocharger, using ambient air for cooling. The intake air is passed through an aftercooler (heat exchanger) mounted in front of the radiator before going to the intake manifold.Alternating Current (AC)The direction of current flow changes (alternates) regularly and constantly.American Wire Gauge (AWG)A measure of the diameter (and therefor the current carrying ability) of electrical wire. The smaller the AWG number, the larger the wire.Before Top Dead Center (BTDC) or Before Top Center (BTC)The 180° of crankshaft rotation before the piston reaches Top Dead Center (normal direction of rotation).Boost Pressure SensorThis sensor measures inlet manifold air pressure and sends a signal to the ECM.Brushless Torque Motor (BTM)Solenoid used to move fuel rack servo spool valve and timing advance spool valve.Bypass CircuitA circuit, usually temporary, to substitute for an existing circuit, typically for test purposes.CalibrationAs used here, is an electronic adjustment of a sensor signal.Cruise Control RangeThe range that the cruise control can operate within. Usually limited to the speed range anticipated on the open road.CodeSee Diagnostic Code.Customer Specified ParameterA Parameter that can be changed and whose value is set by the customer. Protected by Customer Passwords.Data LinkAn electrical connection for communication with other microprocessor based devices that are compatible with the American Trucking Association and SAE Standard such as trip recorders, electronic dashboards, and maintenance systems. The Data Link is also the communication medium used for programming and troubleshooting with Caterpillar devices.Desired Rack Position ("Des Rack Pos" on ECAP)The rack setting calculated by the ECM as needed to attain or maintain the Desired RPM.Desired RPMAn input to the electronic governor within the ECM. The electronic governor uses inputs from the Throttle Position Sensor, Engine Speed/Timing Sensor and Customer Parameters to determine "Desired RPM".Desired Timing Advance ("Des Timing Adv" on ECAP)The injection timing advance calculated by the ECM as required to meet emission and performance specifications.Diagnostic CodeSometimes referred to as a "fault code", it is an indication of a problem or event in the PEEC III System.Diagnostic LampSometimes referred to as the "check engine light", it is used to warn the operator of the presence of an active diagnostic code.Digital Diagnostic Tool (DDT)A Caterpillar electronic service tool used for programming and for diagnosing the 3406B PEEC III system.Direct CurrentThe type of current where the only direction of current flow is consistently in one direction only.Duty CycleSame as Pulse Width Modulation.Electronic Control Analyzer Programmer (ECAP)A Caterpillar Electronic Service Tool used for programming and diagnosing a variety of electronic controls. Electronic Control Module (ECM)The engine control computer that provides power to the PEEC III electronics, monitors PEEC III inputs and acts as a governor to control engine rpm.Engine Speed