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 ON.

Action Taken When the Fault Code is ActiveThe ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.Engine intake air throttle actuation will be disabled. The engine intake air throttle will default to the open position.

Exhaust Gas Recirculation (EGR) valve operation will be disabled.Diesel exhaust fluid injection into the aftertreatment system is disabled.Active and stationary regeneration of the diesel particulate filter will be disabled.Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.Conditions for Clearing the Fault CodeTo validate the repair, start the engine and let it idle for 5 minutes. After 5 minutes, shut OFF the engine, perform a key cycle, and leave the key in the ON position for 1 minute.The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop TalkPossible causes of this fault code include:

A short circuit to ground in the engine harnessA malfunctioning engine intake air throttle actuator

Possible Cause:1) Engine Intake throttle actuator failure2) Engine harness3) ECM failure