SEAL 5P5672 - Caterpillar

Illustration 1 g00284479
Example Of Pulse Width Modulation
Rated Fuel Position ("Rated Fuel Pos") - The rated fuel position indicates the maximum allowable fuel position (longest injection pulse). The rated fuel position will produce rated power for this engine configuration.Reference Voltage - The reference voltage is a regulated voltage that is used by the sensor in order to generate a signal voltage.Sensor - A sensor is used to detect a change in the pressure, in the temperature, or in mechanical movement. When any of these changes are detected, a sensor converts the change into an electrical signal.Service Program Module (SPM) - The SPM is a software program on a computer chip that was programmed at the factory. Short Circuit - A short circuit is an electrical circuit that is mistakenly connected to an undesirable point. For example, an electrical contact is made with the frame whenever an exposed wire rubs against a vehicle's frame.Signal - A signal is a voltage or a wave that is used to transmit information that is typically from a sensor to the ECM.Speed Burp - A speed burp is a sudden brief change in engine rpm.Speed-timing Sensor - The speed-timing sensor is a sensor that provides a Pulse Width Modulated signal to the ECM. The ECM interprets this signal as the crankshaft position and the engine speed.Subsystem - A subsystem is a part of the engine system that relates to a particular function.Supply Voltage - Supply voltage is a constant voltage that is supplied to a component in order to provide electrical power for operation. Supply voltage may be generated by the ECM. Supply voltage may also be the battery voltage of the vehicle that is supplied by the vehicle wiring."T" Harness - This harness is a test harness that is designed to permit normal circuit operation and the measurement of the voltage simultaneously. Typically, the harness is inserted between the two ends of a connector.Throttle Position - The throttle position is sent from the accelerator pedal. This signal is interpreted by the ECM. The throttle position may be used as part of a power take-off control.Total Tattletale - The total tattletale is the total number of changes to all system parameters.