Cummins ISB4.5 CM2150 Fault Code: 2288 PID: 103 SPN: 103 FMI: 0 Turbocharger 1 Speed – Data Valid but Above Normal Operating Range – Least Severe Level.

Circuit Description
The 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 engine control module (ECM) interprets this signal and converts it to a turbocharger speed reading.

Component Location
The turbocharger speed sensor is mounted in the center housing of the turbocharger.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running.

Conditions for Setting the Fault Codes
The ECM detects that the turbocharger speed is above the maximum calibratible limits.

Action Taken When the Fault Code is Active
-The ECM logs the fault code immediately when the diagnostic runs and fails.
-The ECM will reduce torque output of the engine to reduce turbocharger speeds.

Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.

Shop Talk
When 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.