CM850 Electronic Control System – FAULT CODE 595 (ISC/QSC/ISL/QSL Automotive, Industrial, or Marine Application)

Turbocharger Number 1 Speed High – Data Valid but Above Normal Operational Range – Moderately Severe Level


Fault Code: 595
PID: P103
SPN: 103
FMI: 0/16
LAMP: Amber

Turbocharger Number 1 Speed High – Data Valid but Above Normal Operational Range – Moderately Severe Level. High turbocharger speed has been detected.

Engine power derate. The ECM uses an estimated turbocharger speed.

Turbocharger Number 1 Speed High Circuit

Circuit Description

The turbocharger speed sensor is a variable reluctance speed sensor. It consists of a coil of wire and an iron core. The target on the turbocharger shaft is a ground flat in the center of the shaft.

Component Location

The turbocharger speed sensor is mounted in the center housing of the turbocharger. Refer to Procedure 100-002 for a detailed component location view.

Shop Talk

This fault can come active any time the key is on and the electronic control module (ECM) detects turbocharger speed greater than a calibration limit. This fault can be caused by failures in the following components:

  • Turbocharger speed sensor
  • Engine harness
  • ECM power supply or grounds
  • Electronic vehicle accessories which emit excessive electromagnetic interference.

This fault becomes inactive any time the ECM detects a valid turbocharger speed.

If the fault occurs intermittently:

  • Look for causes of intermittent open circuit or short circuits in the turbocharger speed sensor circuit (including the speed sensor pigtail connector).
  • Look for sources of electronic noise such as poorly installed vehicle electronic components.
  • Ensure that vehicle chassis grounds are in good condition.
  • Ensure that the ECM power supply and ground circuits are in good condition and that this power supply is not shared with other vehicle electronics.

Refer to Troubleshooting Fault Code t05-595

Last Modified:  08-Jul-2010