BRACKET 2341097 - Caterpillar

Probable Causes
Diagnostic codes
High ambient air temperature
Intake air restriction and/or high altitude
Intake air from a heated areaRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 1
Troubleshooting Test Steps    Values    Results    
1. Diagnostic Codes
A. Establish communication between the electronic service tool and the Electronic Control Module (ECM). Refer to Troubleshooting, "Electronic Service Tools", if necessary.
   
Diagnostic codes
   
Result: There are active or logged codes.
Troubleshoot any codes before continuing with this procedure.
Result: There are no active or logged codes.
Proceed to Test Step 2.
   
2. High Ambient Air Temperature
A. Determine if the ambient air temperature is within the design specifications for the cooling system and the air charge cooler.
   
Ambient Air temperature
   
Result: The ambient air temperature is not within the design specifications.
When possible, modify the cooling system and the air charge cooler in order to make the system suitable for local conditions.
Result: The ambient air temperature is within the design specifications.
Operate the engine at a reduced load or operate the engine at a reduced speed.
Proceed to Test Step 3.
   
3. Intake Air Restriction and/or High Altitude
A. Measure the intake manifold pressure while the engine is operating under load. For specific data, refer to the Technical Marketing Information (TMI) for the engine.
Note: Low air pressure at the air intake for the turbochargers can be caused by a restriction in the air intake or a high altitude. When the pressure of the intake air is low, the turbochargers work harder in order to achieve the desired intake manifold pressure. This increases intake air temperature.
   
Intake air problem
   
Result: There is a suspected intake air restriction.
Check for blocked air filters. Check for obstructions in the air intake.
Replace the air filters or remove the obstruction from the air intake.
Result: High altitude operation is suspected of causing the symptom.
Make sure that the settings for the engine are correct for the altitude.
Result: There are no air restrictions or altitude issues.
Proceed to Test Step 4.
   
4. Intake Air from a Heated Area
A. Ensure that the air inlet system is not receiving air from a heated area.
   
Intake air temperature
   
Result: The intake air is from a heated area.
If necessary, relocate the air supply to the intake manifold to the outside of the engine enclosure.
Check for air leaks in the pipe between the air inlet and the inlet to the turbocharger compressor.
Result: The intake air is not from a heated area.
Contact the Technical Communicator at a Cat dealer.