Cummins ISB CM850 (2003-06) Fault Code: 595 (ISC) PID: 103 SPN: 103 FMI: 0 Turbocharger Number 1 Speed High – Data Valid but Above Normal Operational Range – Moderately Severe Level. High turbocharger speed has been detected.

Cummins ISB CM850 (2003-06) Fault Code: 595 (ISC) PID: 103 SPN: 103 FMI: 0 Turbocharger Number 1 Speed High – Data Valid but Above Normal Operational Range – Moderately Severe Level. High turbocharger speed has been detected.

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:

1)Turbocharger speed sensor
2)Engine harness
3)ECM power supply or grounds
4)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:

1)Look for causes of intermittent open circuit or short circuits in the turbocharger speed sensor circuit (including the speed sensor pigtail connector).
2)Look for sources of electronic noise such as poorly installed vehicle electronic components.
3)Ensure that vehicle chassis grounds are in good condition.
4)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.

Possible repairs:

1)Repair or replace the damaged connector or turbocharger speed sensor.
2)Repair or replace the engine harness or connector(s).
3)Replace the ECM.