ELBOW 0308156 - Caterpillar

Example of Pulse Width Modulation (PWM) 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, unchanging 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.Remote Station OperationEngine speed control from a location outside of the vehicle cab, typically for some type of PTO operation for pumping or other application using engine power.SensorA device used to detect and convert a change in pressure, temperature, or mechanical movement into an electrical signal.Service Program Module (SPM)A software program on a factory programmable computer chip, designed to adapt an Electronic Service Tool 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, unwanted change in engine rpm.Speed/Timing SensorProvides a Pulse Width Modulated Signal to the ECM, which the ECM interprets as crankshaft position, direction of rotation and engine rpm and sends the signal to ECM. Standard SAE Diagnostic Communications Data LinkRefer to CAT Data Link.SubsystemAs used here, it is a part of the Electronic 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.System Configuration ParametersParameters which affect power rating family or emissions.Throttle PositionThe ECM interpretation of the signal from the Throttle Position Sensor.Throttle Position SensorAn electronic sensor which is connected to an accelerator pedal or a hand lever and sends a Pulse Width Modulated Signal to the ECM.Timing CalibrationThe adjustment of an electrical signal as a means of correcting timing error between the crankshaft and camshaft. Refer to Speed/Timing Sensor.Top Center (TC)The 180 degrees of crankshaft rotation before the piston reaches the very top of its travel (normal direction of rotation).Torque LimitProgrammable parameter which limits the maximum torque based on PTO Configuration and operation.Total TattletaleTotal number of changes to all Customer Specified Parameters stored in the ECM.TransducerA device which converts a mechanical signal to an electrical signal. Requires an external power source to operate.Transmission Output SensorThe Transmission Output Speed Sensor (TOS) consists of the sensor and associated wiring. The sensor reads movement of the transmission output shaft from the teeth on a chopper wheel. The ECM receives a signal from the TOS and provides