Circuit DescriptionThe aftertreatment diesel exhaust fluid dosing unit performs many functions, one of which is to generate adequate aftertreatment diesel exhaust fluid pressure in the lines using a pump to allow for dosing. The aftertreatment diesel exhaust fluid controller provides a battery voltage supply and a ground to the aftertreatment diesel exhaust fluid dosing unit. The controller also supplies a signal to the dosing unit to control the aftertreatment diesel exhaust fluid output. This signal changes based on the aftertreatment diesel exhaust fluid pressure being commanded. Component LocationThe aftertreatment diesel exhaust fluid dosing unit location is original equipment manufacturer (OEM)...

Circuit DescriptionThe aftertreatment diesel exhaust fluid line heater relay provides the power supply to line heaters 1, 2, and 3. It is controlled by the aftertreatment diesel exhaust fluid controller. Component LocationThe aftertreatment diesel exhaust fluid line heater relay location is original equipment manufacturer (OEM) dependent. Refer to the OEM service manual for more information. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position. Conditions for Setting the Fault CodesThe aftreatment diesel exhaust fluid controller detects that the voltage in the diesel exhaust fluid line heater relay circuit is above a calibratible value....

Circuit DescriptionThe aftertreatment diesel exhaust fluid line heater relay provides the power supply to line heaters 1, 2, and 3. It is controlled by the aftertreatment diesel exhaust fluid controller. Component LocationThe aftertreatment diesel exhaust fluid line heater relay location is original equipment manufacturer (OEM) dependent. Refer to the OEM service manual for more information. Conditions for Running the DiagnosticsThis diagnostic runs at key off. The fault will be active at the next key-on event. Conditions for Setting the Fault CodesThe aftreatment diesel exhaust fluid controller detects that the voltage in the diesel exhaust fluid line heater relay circuit is...

Circuit DescriptionThe aftertreatment diesel exhaust fluid line heater relay provides the power supply to line heaters 1, 2, and 3. It is controlled by the aftertreatment diesel exhaust fluid controller. Component LocationThe aftertreatment diesel exhaust fluid line heater relay location is original equipment manufacturer (OEM) dependent. Refer to the OEM service manual for more information. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswtich is ON. Conditions for Setting the Fault CodesThe aftreatment diesel exhaust fluid controller detects that the diesel exhaust fluid line heater relay circuit is open. Action Taken When the Fault Code is Active-The ECM...

Circuit DescriptionThe aftertreatment diesel exhaust fluid (DEF) dosing valve is controlled by the aftertreatment DEF controller. When the engine electronic control module (ECM) commands DEF dosing, the DEF controller sends a pulse width modulated (PWM) signal to the dosing valve, which opens the dosing valve and allows DEF to be sprayed into the exhaust stream. Component LocationThe aftertreatment diesel exhaust fluid dosing valve is installed in the exhaust system. It is mounted directly to the aftertreatment decomposition tube, before the SCR catalyst. Installation position will vary, based on the aftertreatment architecture and the original equipment manufacturer (OEM). Conditions for Running...