Circuit DescriptionThe Engine Control Module (ECM) continuously monitors the engine speed at idle and adjusts fueling to maintain governed idle speed. Component LocationThe engine speed is monitored by the crankshaft and/or camshaft position sensors. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the engine is operating at idle and PTO is not active. Conditions for Setting the Fault CodesThe Engine Control Module (ECM) detected the engine speed was 50 rpm above governed idle speed for 30 seconds. Action Taken When the Fault Code is ActiveThe ECM illuminates the amber CHECK ENGINE lamp and/or Malfunction Indicator Lamp (MIL) after the...

Circuit DescriptionThe Engine Control Module (ECM) continuously monitors the engine speed at idle and adjusts fueling to maintain governed idle speed. Component LocationThe engine speed is monitored by the crankshaft and/or camshaft position sensors. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the engine is operating at idle and PTO is not active. Conditions for Setting the Fault CodesThe Engine Control Module (ECM) detected the engine speed was 50 rpm below governed idle speed for 30 seconds. Action Taken When the Fault Code is ActiveThe ECM illuminates the amber CHECK ENGINE lamp and/or Malfunction Indicator Lamp (MIL) after the...

Circuit DescriptionThe EGR valve device driver in the ECM provides power to the EGR valve motor. The EGR valve motor is used to move the EGR valve to the correct position, as commanded by the ECM. Component LocationThe EGR valve device driver is internal to the ECM and can not be serviced separately. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running. Conditions for Setting the Fault CodesThe Engine Control Module (ECM) detected low power at the EGR valve device driver. The ECM was no longer able...

Circuit DescriptionThe aftertreatment intake NOx (nitrogen oxides) sensor is a smart device and communicates with the engine control module (ECM) via the J1939 data link. The aftertreatment intake NOx sensor performs internal diagnostics and reports malfunctions back to the primary ECM using the J1939 data link. The NOx sensor is permanently attached to the NOx control module. They are serviced as a single component and can not be replaced individually. The aftertreatment intake NOx sensor is used to measure the NOx emissions at the intake of the aftertreatment system. Component LocationThe aftertreatment intake NOx sensor is mounted on the engine...

Circuit DescriptionThe high-pressure relief valve is a mechanical device that opens when the fuel pressure in the fuel rail exceeds a critical warning limit. Component LocationThe high-pressure fuel pump is mounted to the gear housing. The fuel pump actuator is mounted on the fuel pump. The fuel pressure sensor is mounted in the high pressure fuel rail. The fuel pressure relief valve is mounted on the high pressure fuel rail. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the engine is running. Conditions for Setting the Fault CodesThe Engine Control Module (ECM) detected the fuel pressure relief valve had...