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 Code is ActiveThe ECM illuminates the amber CHECK ENGINE lamp 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.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 CodeStart and idle the engine for 1 minuteTurn the key switch OFF and allow the ECM to completely powerdown.Turn the key switch ON.The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.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 malfunctioning engine intake air throttle actuator

Possible Cause:1) Engine harness2) ECM calibration