Cummins ISX11.9 CM2250 (2010-12) Fault Code: 2964 PID: 105 SPN: 105 FMI: 15 Intake Manifold 1 Temperature- Data Valid But Above Normal Operating Range- Least Severe Level

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 engine intake manifold temperature value is used by the engine control module (ECM) for the engine protection system and engine emission control.

The ECM supplies 5-VDC to the intake manifold temperature signal circuit and 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.

Component Location
The intake manifold 1 temperature sensor is located in the air intake manifold.

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

Conditions for Setting the Fault Codes
The ECM detects that the intake manifold temperature is greater than 120?C [248?F].

Action Taken When the Fault Code is Active
The ECM logs the fault code immediately when the diagnostic runs and fails.
The torque output of the engine will be reduced.
Conditions for Clearing the Fault Code
To validate the repair using a Diagnostic Road Test, utilize a route that incorporates both stop-and-go city driving and steady state highway driving. It may be necessary to load the unit for certain diagnostics in the ECM to run.
To validate the repair using a Chassis Dynamometer Test, utilize a routine that incorporates acceleration and motoring events, steady state highway operation, and load. This will simulate normal driving and allow the diagnostics in the ECM to run.
The fault code status displayed by INSITE? electronic service tool will change to INACTIVE and the torque derate will be removed immediately after the intake manifold temperature falls below 120?C [248?F] and the diagnostic runs and passes.
The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults.

Shop Talk
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.

Possible Cause:
1) Intake Manifold temperature Sensor failure
2) ECM calibration