104740-8122 ZEXEL INJECTION-PUMP ASSEMBLY Cross 1047408122

Example of Pulse Width Modulation SignalsRated Fuel Position("Rated Fuel Pos" on ECAP) - this indicates the maximum allowable fuel position (longest injection pulse). It will produce rated power for this engine configuration.Reference VoltageA regulated voltage supplied by the ECM to a sensor. The reference voltage is used by the sensor to generate a signal voltage.Remote Mounted Throttle Position SensorThis sensor measures pedal position and sends a signal to the ECM. The sensor is mounted off of the throttle pedal assembly, usually near the fire wall in the engine compartment (not the cab). The throttle pedal is connected through an adjustable linkage to this pedal. See Pedal Mounted Throttle Position Sensor.Retarder Enable SignalThe retarder enable signal interfaces the ECM to the engine retarder. This will prohibit operation of the engine brake during undesirable engine operating conditions (such as while the engine is being fueled).SensorA device used to detect and convert a change in pressure, temperature, or mechanical movement into an electrical signal.Service Program ModuleA software program on a factory programmable computer chip, designed to adapt an ECAP or DDT to a specific application.Short CircuitA condition where an electrical circuit is unintentionally connected to an undesirable point. Example: a wire which rubs against a vehicle frame until it wears off its insulation and makes electrical contact with the frame.SignalA voltage or waveform used to transmit information typically from a sensor to the ECM.Speed "burp"A sudden brief change in engine speed.SubsystemAs used here, it is a part of the 3176 System that relates to a particular function, for instance: throttle subsystem, etc.Supply VoltageA constant voltage supplied to a component to provide electrical power for its operation. It may be generated by the ECM, or it may be vehicle battery voltage supplied by the vehicle wiring. "T" HarnessA test harness designed to permit normal circuit operation while measuring voltages, typically inserted between the two ends of a connector.Throttle PositionThe ECM's interpretation of the signal from the Throttle Position Sensor.Throttle Position SensorAn electronic sensor which is connected to the accelerator pedal and sends a Pulse Width Modulated signal to the ECM.Total TattletaleTotal number of changes to all Customer Specified Parameters.TransducerA device which converts a mechanical signal to an electrical signalTransducer ModuleA sealed unit mounted mounted on one end of the ECM, which contains the Boost Pressure Sensor and Atmospheric Pressure Sensor (if equipped), and protective signal conditioning circuitry.Vehicle Speed BufferA device used to condition and amplify the output of the vehicle speed sensor.Vehicle Speed SensorAn electromagnetic pickup that measures vehicle speed from the rotation of gear teeth in the drive train of the vehicle.Warning LampUsed to warn the operator of the presence of a Caterpillar Engine Protection detected problem.