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Intake Manifold 1 Temperature – Data Valid but Above Normal Operating Range – Most Severe Level
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 155 PID: P105 SPN: 105 FMI: 0/0 LAMP: Red SRT: |
Intake Manifold 1 Temperature – Data Valid but Above Normal Operating Range – Most Severe Level. Intake manifold air temperature signal indicates intake manifold air temperature above engine protection critical limit. |
Progressive power 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. |
 ISX – Intake Manifold 1 Pressure Sensor Circuit
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 ISM – Intake Manifold 1 Pressure Sensor Circuit
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Circuit Description
The intake manifold air 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 air temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the intake manifold air temperature.
This fault code indicates that the intake manifold air temperature has exceeded the maximum engine protection limit.
Component Location
The intake manifold air temperature sensor is located in the air intake manifold. Refer to Procedure 100-002 in Section E.
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 air temperature is greater than 132°C [270°F] for 5 seconds.
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, calibrate the ECM. Refer to Procedure 019-032 in Section 19.
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.
Refer to Troubleshooting Fault Code t05-155
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