C32 Engine for D11T Track-Type Tractors Inlet Air Temperature Is High Caterpillar


Inlet Air Temperature Is High
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C32 Engine for D11T Track-Type Tractors [RENR9327]
AIR INLET AND EXHAUST SYSTEM
INLET GP-AIR
C32 Engine for D11T Track-Type Tractors Inlet Air Temperature Is High
1.1. Probable Causes
2.1. Recommended Actions
3.2. High Ambient Air Temperature
4.2. High Coolant Temperature
5.2. High Inlet Air Restriction and/or High Altitude
6.3. Inlet Air Restriction
7.3. High Altitude
8.2. Faulty Intake Manifold Air Temperature Sensor and/or the Circuit
9.2. Insufficient Flow of Cooling Water Through the Aftercooler
10.2. Insufficient Flow of Air Through the Aftercooler

Use this procedure in order to troubleshoot a high intake air temperature or use this procedure if one of the following event codes is active. Refer to Troubleshooting, "Event Codes" for information about event codes and the default trip points for these codes. You must access the engine monitoring system on AVSpare Electronic Technician (ET) in order to view the current trip points for these codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".

Table 1
Event Code    
Description     Conditions which Activate the Code     System Response    
E1001(1) High Right Intake Manifold Air Temperature     The inlet air temperature has exceeded the trip point for the programmed delay time.     The code is logged.    
E1001(2) High Right Intake Manifold Air Temperature     The code is logged.
The engine power is derated.

Probable Causes

  • High ambient air temperature

  • High coolant temperature

  • High inlet air restriction and/or high altitude

  • Faulty inlet air temperature sensor and/or circuit

  • Insufficient flow of cooling water through the aftercooler

  • Insufficient flow of air through the aftercooler

Recommended Actions

High Ambient Air Temperature

Determine if the ambient air temperature is within the design specifications for the cooling system.

Determine the cause of the high air temperature. Modify the inlet air system in order to supply intake air that is within specifications, if necessary.

High Coolant Temperature

Check for a high coolant temperature for the engine.

Refer to Troubleshooting, "Coolant Temperature Is High".

High Inlet Air Restriction and/or High Altitude

When inlet air pressure is low, the turbocharger works harder in order to achieve the desired inlet air pressure. This increases inlet air temperature.

Measure the inlet air pressure while the engine is operating under load. For specific data, refer to the Technical Marketing Information (TMI) for your engine.

Inlet Air Restriction

Check for plugged air filters. Check for obstructions to the air inlet.

Replace the air filters and/or remove the obstruction from the air inlet.

High Altitude

Confirm that the settings for the engine are correct for operation at the altitude of the engine installation.

Faulty Intake Manifold Air Temperature Sensor and/or the Circuit

Allow the engine to cool. Remove the sensor from the engine. Use Cat ET to check the status of the "Engine Coolant Temperature" parameter. Compare the reading to the ambient air temperature. If the sensor is OK, the readings will be approximately equal.

If the readings are not approximately equal, switch the suspect sensor with a sensor that is known to be good. Compare the reading of the good sensor to the ambient air temperature. Replace the suspect sensor, if necessary.

Insufficient Flow of Cooling Water Through the Aftercooler

Check the inlet temperature of the coolant for the aftercooler. Compare the reading to the regulated temperature. If the temperature is OK, check the outlet temperature of the coolant for the aftercooler. A high temperature differential indicates an insufficient flow rate.

If there is a high differential between the inlet temperature and the outlet temperature of the coolant for the aftercooler, perform the following procedure:

  • Check the water circuit of the aftercooler for obstructions.

  • Check the pump for proper operation.

Perform the necessary repairs.

Insufficient Flow of Air Through the Aftercooler

Determine the pressure differential of the inlet air across the aftercooler. For specific data, refer to the Technical Marketing Information for your engine.

If the pressure differential of the air across the aftercooler does not match the specifications, clean the aftercooler.

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