Circuit DescriptionNormally, switches, accelerators, and other components are connected to the engine control module (ECM) directly through individual wires. Multiplexing allows those same components to be hard wired to an original equipment manufacturer (OEM) vehicle electronic control unit (VECU) or transmission electronic control unit in the cab. Then component values and states from components (such as sensors, accelerators, and switches) can be transmitted from the OEM VECU to the Cummins® ECM over the Society of Automotive Engineers (SAE) J1939 data link. Messages sent from the OEM VECU or transmission electronic control unit are received by the Cummins® ECM and used...

Circuit DescriptionThe engine control module uses the engine intake throttle actuator position sensor to determine whether or not the actuator is meeting the commanded position. The engine control module supplies 5 Volts to the engine intake throttle actuator position signal circuit, and the engine throttle actuator position sensor outputs a voltage signal to the engine control module based on the actuator position. The engine control module converts this signal into a percentage value, 0 to 100, indicating actuator position. A fully open actuator is equivalent to 100 percent. Component LocationThe engine throttle actuator position sensor is internal to the engine...

Circuit DescriptionThe engine control module uses the engine intake throttle actuator position sensor to determine whether or not the actuator is meeting the commanded position. The engine control module supplies 5 volts to the engine intake throttle actuator position signal circuit, and the engine intake throttle actuator position sensor outputs a voltage signal to the engine control module based on the actuator position. The engine control module converts this signal into a percentage value, 0 to 100, indicating actuator position. A fully open actuator is equivalent to 100 percent. Component LocationThe intake throttle actuator position sensor is internal to the...

Circuit DescriptionThe engine control module (ECM) uses the engine intake throttle actuator position sensor to determine whether or not the actuator is meeting the commanded position. The ECM supplies 5 volts to the engine intake throttle actuator position signal circuit, and the engine intake throttle actuator position sensor outputs a voltage signal to the ECM based on the actuator position. The ECM converts this signal into a percentage value, 0 to 100, indicating actuator position. A fully open actuator is equivalent to 100 percent. Component LocationThe engine intake throttle actuator position sensor is internal to the intake throttle actuator assembly...

Circuit DescriptionFor an air-assisted SCR aftertreatment system, the aftertreatment diesel exhaust fluid dosing unit requires air pressure from the OEM air tanks in order to prime and help carry the diesel exhuast fluid from the dosing unit to the aftertreatment nozzle. The diesel exhaust fluid dosing unit precisely measures the amount of diesel exhaust fluid to be injected into the aftertreatment system. The diesel exhaust fluid dosing unit has three primary cycles: priming, dosing, and purging. The priming cycle occurs at initial engine start makes sure that diesel exhaust fluid is available at the diesel exhaust fluid dosing unit. During...