Circuit DescriptionThe DEF quality sensor is a smart device and communicates with the engine engine control module (ECM) via the J1939 data link. The DEF quality sensor receives power and ground directly from the battery. The sensor performs its own internal diagnostics and reports malfunctions back to the primary engine ECM via the J1939 data link. The DEF quality sensor is used to measure the concentration of the DEF in the tank. Component LocationThe DEF quality sensor is typically mounted in the DEF tank or in-line with the DEF dosing unit supply line. Reference the OEM service manual for a...

Circuit DescriptionThe original equipment manufacturer (OEM) security device is an optional device connected to the primary ECM through a J1939 data link network. Messages sent from the security device are received by the Cummins® ECM and are used to control the anti-theft features. The Cummins® ECM and security device must be configured properly so that proper operation of the system will occur Component LocationThe J1939 data link wiring and location of OEM installed J1939 devices varies by OEM. See equipment manufacturer service information for component location. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the...

Circuit DescriptionThe OEM security device is an optional device connected to the primary engine control module (ECM) through a J1939 data link network. Messages sent from the security device are received by the Cummins® ECM and are used to control the anti-theft features. The Cummins® ECM and security device must be configured properly so that proper operation of the system will occur. Component LocationThe J1939 data link wiring and location of OEM installed J1939 devices varies by OEM. See equipment manufacturer service information for component location Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the...

Circuit DescriptionThe engine oil pressure switch is used by the electronic control module (ECM) to monitor the lubricating oil pressure. If the oil pressure drops below the engine protection limit, the switch will open and cause Fault Code 415 to log. The oil pressure switch is normally closed when the engine is not running and open when oil pressure is present. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the engine is running. Conditions for Setting the Fault CodesThe ECM detects that the engine oil pressure is below minimum operating conditions. Action Taken When the Fault Code is Active-The...

Circuit DescriptionThe water-in-fuel sensor is attached to the fuel filter. The electronic control module (ECM) provides a 5 volt reference signal to the water-in-fuel sensor. When the water collected in the fuel filter covers the sensor probes, the water-in-fuel sensor pulls the 5-VDC reference voltage to ground, indicating high water accumulation in the fuel filter. Component LocationThe water-in-fuel sensor is integrated into the bottom of the OEM supplied suction fuel filter. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position. Conditions for Setting the Fault CodesThe ECM detects that water in the fuel...