Cummins ISC CM2150 (2007-09) Fault Code: 155 PID: 105 SPN: 105 FMI: 0 Intake Manifold 1 Temperature - Data Valid but Above Normal Operational Range - Most Severe Level. Intake manifold air temperature signal indicates intake manifold air temperature above engine protection critical limit.

Verify the electronic control module (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, recalibrate the ECM. .

The intake manifold air temperature sensor measures the temperature of the charge air as it passes through the intake manifold.

Possible causes:

1)Restricted air flow through the charge air cooler
2)Undersized charge air cooler
3)High turbocharger compressor outlet temperature
4)For marine engines verify the cooling water intake is not blocked or clogged with debris.

Possible repairs:

1)Replace the intake manifold temperature sensor.