SEAL 1538594 - Caterpillar

Example of Pulse Width ModulationRated Fuel Position("Rated Fuel Pos") - 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 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 Brake SwitchThis OEM supplied and installed switch is typically a pressure switch. This switch is normally closed with the pedal released. Depressing the brake will open the circuit.Service Engine Soon LampSometimes referred to as the "Diagnostic Lamp", it is used to alert the operator of the presence of an active event and is used to flash a diagnostic code.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 SensorA sensor that measures crankshaft position, direction of rotation and engine rpm and sends signal to ECM.Standard SAE Diagnostic Communication Data LinkRefer to ATA 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."T" HarnessA test harness designed to connect into vehicle or engine harness which allows normal circuit operation while providing a breakout or "T" to measure signals.Throttle PositionThe ECM 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.Timing CalibrationThe adjustment of an electrical signal as a means of correcting timing error between the crankshaft and camshaft. Refer to Speed/Timing Sensor.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.Transmission StyleProgrammable parameter that designates the type of transmission in the vehicle and the circuits connected to the ECM. The transmission relay, cruise control, idle/PTO, and exhaust brake operation are affected by this parameter setting.Trip RecorderAn after market device dedicated to recording vehicle and engine operating parameters during vehicle service. Used to analyze driving habits and produce driver logs.Vehicle Speed CalibrationProgrammable parameter used by the ECM to scale the