Circuit DescriptionThe crankcase breather heater is used to keep the crankcase breather filter housing from freezing. The ECM supplies battery voltage to the breather heater when heating is commanded. Component LocationThe crankcase breather heater is mounted to the crankcase breather filter housing. 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 the crankcase breather heater signal voltage was out of range high for more than 10 seconds. Action Taken When the Fault Code is ActiveThe ECM...

Circuit DescriptionThe crankcase breather heater is used to keep the crankcase breather filter housing from freezing. The ECM supplies battery voltage to the breather heater when heating is commanded. Component LocationThe crankcase breather heater is mounted to the crankcase breather filter housing. 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 the crankcase breather heater signal circuit was shorted to ground. Action Taken When the Fault Code is ActiveThe ECM illuminates the amber CHECK ENGINE lamp...

Circuit DescriptionThe overcrank protection feature (or starter lockout) is designed to prevent damage to the starter motor during hard start conditions. Excessive cranking of the engine can cause the starter motor to overheat, resulting in permanent damage. When excessive engine cranking is detected, the overcrank protection feature locks out the starter until the starter motor has adequately cooled, and is safe to operate again. Component LocationThe overcrank protection feature is controlled by the ECM, and can not be modified. Conditions for Running the DiagnosticsThis diagnostic runs when the engine is being started. Conditions for Setting the Fault CodesThe Engine Control...

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 rail pressure had exceeded...

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...