SPN 105 - FMI 0 (Fault Code 155)

SPN 105 - FMI 0 (Fault Code: 155)
Intake Manifold 1 Pressure/Temperature Sensor Circuit

Fault Code: 155
PID(P), SID(S): P105
SPN: 105
FMI: 0/0
Lamp: RED

REASON: 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.

EFFECT: Progressive power and derate increasing in severity from time of alert. If the Engine Protection Shutdown feature is enabled, engine will shut down 30 seconds after the red STOP lamp starts flashing.

Circuit Description:
The intake manifold temperature sensor is a variable resistor sensor and is used to measure the temperature of the air entering the intake manifold of the engine. The electronic control module (ECM) supplies 5 volts to the intake manifold temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the intake manifold temperature.

This fault code indicates that the intake manifold temperature has exceeded the maximum engine protection limit.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes:
The ECM detects that the intake manifold temperature is above the maximum operating limits in the ECM calibration.

Action Taken When the Fault Code is Active:
• The ECM illuminates the red STOP ENGINE light immediately when the diagnostic runs and fails.
• The torque output of the engine will be reduced.
• Maximum engine operating speed will be decreased.
• The engine will be shut off if the Engine Protection Shutdown feature is enabled.

Conditions for Clearing the Fault Code:
The ECM will turn off the red STOP ENGINE light immediately after the diagnostic runs and passes.

Shop Talk:

  • 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 of this fault code include:
• Restricted air flow through the charge air cooler
• Undersized charge air cooler
• High turbocharger compressor outlet temperature
• For marine engines verify the cooling water intake is not blocked or clogged with debris.

Read Mode:
SPN 105 - FMI 4 (Fault Code 154)
SPN 105 - FMI 3 (Fault Code 153)


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