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Intake Manifold 1 Temperature – Data Valid but Above Normal Operational Range – Least Severe Level
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 2964 PID: P105 SPN: 105 FMI: 0/15 LAMP: None SRT: |
Intake Manifold 1 Temperature – Data Valid but Above Normal Operational Range – Least Severe Level. Intake manifold air temperature signal indicates intake manifold air temperature is above engine protection warning limit. |
Progressive power derate increasing in severity from time of alert. |
 ISB, ISC, and ISL – Intake Manifold 1 Pressure/Temperature Sensor
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Circuit Description
The intake manifold 1 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.
When the intake air is cold, the sensor or thermistor resistance is high. The ECM signal voltage only pulls down a small amount through the sensor to a ground. Therefore, the ECM senses a high signal voltage or low temperature. When the intake air is warm, the sensor resistance is low. The signal voltage pulls down a large amount. Therefore, the ECM senses a low signal voltage, or a high temperature.
This fault code indicates that the intake manifold temperature has exceeded the maximum engine protection limit.
Component Location
The intake manifold 1 temperature sensor is located in the air intake manifold. Refer to Procedure 100-002 (Engine Diagrams) in Section E for a detailed component location view.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes
The ECM detects that the intake manifold temperature is greater than a calibratible limit set in the ECM.
Action Taken When the Fault Code is Active
- The torque output of the engine will be reduced.
Conditions for Clearing the Fault Code
The maximum torque output of the engine will return and the fault code will go inactive after the intake manifold air temperature drops below a calibratible limit set in the ECM.
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. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.
The intake manifold 1 temperature sensor measures the temperature of the charge-air as it passes through the intake manifold. Possible causes of this fault code include:
- Plugged charge air cooler fins
- Restricted airflow through the charge air cooler
- An undersized charge air cooler
- High turbocharger compressor outlet temperature.
Refer to Troubleshooting Fault Code t05-2964
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