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. The aftertreatment outlet NOx (nitrogen oxides) sensor is a smart device...

Circuit DescriptionThe engine control module (ECM) controls the engine intake air throttle actuator. The ECM can open and close the throttle based on the operating condtions in order to regulate air flow to the engine. Component LocationThe engine intake air throttle actuator is mounted in the piping between the charge air cooler and intake manifold. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position and the engine is running. Conditions for Setting the Fault CodesThe Engine Control Module (ECM) detected the engine intake air throttle actuator signal is shorted to voltage when the...

Circuit DescriptionThe engine control module (ECM) controls the engine intake air throttle actuator. The ECM can open and close the throttle based on the operating condtions in order to regulate air flow to the engine. Component LocationThe engine intake air throttle actuator is mounted in the piping between the charge air cooler and intake manifold. Conditions for Running the DiagnosticsThis diagnostic runs when the engine intake air throttle actuator is being commanded ON. Conditions for Setting the Fault CodesThe Engine Control Module (ECM) detected the engine intake air throttle actuator signal is shorted to ground when the actuator is commanded...

Circuit DescriptionThe engine control module (ECM) controls the engine intake air throttle actuator. The ECM can open and close the throttle based on the operating condtions in order to regulate air flow to the engine. Component LocationThe engine intake air throttle actuator is mounted in the piping between the charge air cooler and intake manifold. Conditions for Running the DiagnosticsOne part runs when the keyswitch is initially turned ON before the engine is startedConditions for Setting the Fault CodesThe Engine Control Module (ECM) detected the engine intake air throttle actuator failed the autozero span check. Action Taken When the Fault...

Circuit DescriptionThe turbocharger speed sensor is a variable reluctance speed sensor. It consists of a coil of wire and an iron core. The target on the turbocharger shaft is a ground flat in the center of the shaft. As the flat on the turbocharger shaft spins past the speed sensor, a signal is generated. The Engine Control Module (ECM) interprets this signal and converts it to a turbocharger speed reading. Component LocationThe turbocharger speed sensor is mounted in the center housing of the turbocharger. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the engine is running. Conditions for Setting...