Cumminz

Circuit DescriptionThe aftertreatment diesel exhaust fluid return valve is controlled by the aftertreatment diesel exhaust fluid controller. The return valve position determines where afterteatment diesel exhaust fluid will flow as it exits the dosing unit. When the return valve is energized, the dosing system will purge and return the aftertreatment diesel exhaust fluid in the lines to the tank. Component LocationThe aftertreatment diesel exhaust fluid return valve is internal to the aftertreatment diesel exhaust fluid dosing unit and can not be serviced separately. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position. Conditions...

Circuit DescriptionThe aftertreatment diesel exhaust fluid return valve is controlled by the aftertreatment diesel exhaust fluid controller.The return valve position determines where diesel exhaust fluid will flow as it exits the dosing unit.When the return valve is activated, the dosing system will purge and return the diesel exhaust fluid in the lines to the tank. Component LocationThe aftertreatment diesel exhaust fluid return valve is internal to the aftertreatment diesel exhaust fluid dosing unit and can not be serviced separately. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position. Conditions for Setting the Fault...

Circuit DescriptionThe aftertreatment diesel exhaust fluid return valve is controlled by the aftertreatment diesel exhaust fluid controller. The return valve position determines where diesel exhaust fluid will flow as it exits the dosing unit. When the return valve is activated, the dosing system will purge and return the diesel exhaust fluid in the lines to the tank. Component LocationThe aftertreatment diesel exhaust fluid return valve is internal to the aftertreatment diesel exhaust fluid dosing unit and can not be serviced separately. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position. Conditions for Setting...

Circuit DescriptionThe mass air flow sensor is a frequency based device. A constant voltage is applied to a heated wire. This wire is positioned in the air stream and is heated by the electrical current that the voltage produces. As air flows across it, it cools down. The heated wire or film is a positive temperature coefficient (ptc) resistor. This means that the resistance drops when the temperature drops. The drop in resistance allows more current to flow through it, in order to maintain the programmed temperature. This current is changed to a frequency which is sent to the engine...

Circuit DescriptionThe diesel exhaust fluid controller provides a 5 volt supply and a ground to the diesel exhaust fluid pressure sensor. The pressure sensor provides a signal to the diesel exhaust fluid controller on the sensor signal circuit. This sensor signal voltage changes based on the diesel exhaust fluid pressure supplied by the dosing unit. The diesel exhaust fluid controller will detect a low signal voltage at low diesel exhaust fluid pressures, and a high signal voltage at high diesel exhaust fluid pressures. The aftertreatment diesel exhaust fluid pressure sensor reading is communicated to the ECM via the engine data...