CM871 and CM876 Electronic Control Systems, ISX and ISM Engines – FAULT CODE 2288

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Overview

ISX – Turbocharger 1 Speed Circuit SMALL | MEDIUM | LARGE

ISM – Turbocharger 1 Speed Circuit SMALL | MEDIUM | LARGE

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 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.Refer to Procedure 100-002 in Section E.

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 fault code will be set to inactive immediately after the diagnostic runs and passes.

Shop Talk

Verify the ECM calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM. If necessary, calibrate the ECM. Refer to Procedure 019-032 in Section 19.

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.

Refer to Troubleshooting Fault Code t05-2288