Electronic Control System Signature, ISX and QSX15 Engines – FAULT CODE 595

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Overview

ECM Microprocessor SMALL | MEDIUM | LARGE

Circuit Description

The electronic control module (ECM) calculates turbocharger speed based on air to fuel ratio, final timing and inputs from the intake manifold temperature and pressure (Combo) sensor, ambient air pressure sensor and the engine speed sensor. If the calculated turbocharger speed becomes too high, it will cause a derate condition.

Component Location

There is not a physical turbocharger speed sensor in the system. The turbocharger speed is a calculation of intake manifold temperature, intake manifold pressure, ambient air pressure, engine speed, air to fuel ratio, and fuel timing. Refer to Procedure 100-002 in Section E for a detailed component location view.

Shop Talk

Possible causes of this fault code include:

• Intake manifold temperature and pressure (Combo) sensor
• Engine speed sensor
• Ambient air pressure sensor
• Electronic control module (ECM) calibration.

Refer to Troubleshooting Fault Code t05-595.