Cumminz

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 then pulls the 5 volt 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. The OEM supplied fuel filter is located on the intake side of the engine. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in...

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 (ECU) 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 SAE J1939 data link. Component LocationThe SAE J1939 data link wiring and the SAE J1939 devices vary by OEM options. Conditions for Running the DiagnosticsThe first...

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 then pulls the 5 volt 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 the water-in-fuel...

Circuit DescriptionThe engine oil pressure switch is used by the electric control module (ECM) to monitor the lubricating oil pressure. The oil pressure switch is normally closed when the engine is not operating and open when the engine is in operation and oil pressure is present. Component LocationThe location of the oil pressure switch varies by engine model. Conditions for Running the DiagnosticsThis diagnostic runs when the keyswitch is turned ON and before engine speed is detected. The diagnostic only runs once per trip. Conditions for Setting the Fault CodesThe ECM detects that the engine oil pressure switch is indicating...

Circuit DescriptionThe engine oil pressure sensor 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 sensor will open and cause Fault Code 435 to log. The oil pressure sensor is normally closed when the engine is not operating and open when oil pressure is present. Conditions for Running the DiagnosticsThis diagnostic runs when the keyswitch is turned ON and before engine speed is detected. The diagnostic only runs once per trip. Conditions for Setting the Fault CodesThis fault code is logged when an open...