Cumminz

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...

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 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 vehicle engine control unit to the Cummins® ECM over the SAE J1939 data link. Component LocationThe SAE J1939 data link wiring and SAE J1939 devices vary by OEM options. Conditions for Running the DiagnosticsThis diagnostic...

Circuit DescriptionThe aftertreatment diesel exhaust fluid controller is the central control for the selective catalytic reduction (SCR) diesel exhaust fluid dosing system, and handles the dosing activity, tank level sensing, tank temperature sensing, line heating, and tank heating. The diesel exhaust fluid controller communicates to the electronic control module (ECM) via the J1939 data link connection. Component LocationThe location of the aftertreatment diesel exhaust fluid controller varies by application and original equipment manufacturer (OEM). The controller will typically be mounted to the vehicle frame or suitable rigid bracket using 3 or 4 capscrews. Refer to the OEM service manual for...