Circuit DescriptionThe turbocharger speed sensor is a variable reluctance speed sensor. It consists of a coil 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 electronic 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 the Fault CodesThe ECM detects that the turbocharger speed is above the maximum calibratible limits.

Action Taken When the Fault Code is ActiveThe ECM logs the fault code immediately when the diagnostic runs and fails.The ECM will reduce the torque output of the engine to reduce turbocharger speeds.Conditions for Clearing the Fault CodeTo validate the repair, start the engine and let it idle for 1 minute.The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults.

Shop TalkWhen the engine has taken the necessary action to reduce the turbocharger speed, this fault code is logged. This fault code is for information only and no repairs are necessary. The engine can possibly be derated when operating near the maximum turbocharger speed limits.

Possible Cause:1) ECM calibration