DUCT-AIR 3949535 - Caterpillar

Table 1 lists the diagnostic trouble codes for high intake manifold air temperature.
Table 1
Diagnostic Trouble Codes
CDL Code Code Description Comments
E539(1) High Intake Manifold Air Temperature The code indicates that the temperature of the intake air into the engine has risen above the programmed threshold.
Engine power may be derated.
E539(2) High Intake Manifold Air Temperature
E539(3) High Intake Manifold Air Temperature Follow the troubleshooting procedure in order to identify the root cause of the problem.Test Step 1. Check for Active Codes
Establish communication between Caterpillar Electronic Technician (ET) and the ECM. Refer to Troubleshooting, "Electronic Service Tools" for details.
Download the "Product Summary Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
Determine if an associated code is active or logged. Refer to Table 2 for a list of associated codes.
Table 2
Associated Code
CDL Code WCI
E1092 (2)
Check for active diagnostic codes that are related to a high intake manifold air temperature. Check for an active E539 code. Expected Result:No codes are active.Results:
OK - No codes are active at this time, but a high intake manifold air temperature exists for the engine. Proceed to Test Step 2.
E1092 Active - Repair: Refer to Troubleshooting, "Event Codes" in order to troubleshoot the associated diagnostic code.STOP
E539 Active - An E539 event code is active. There is a high intake manifold air temperature for the engine. Proceed to Test Step 2.Test Step 2. Check the ATAAC for Restrictions (if equipped)
Illustration 1 g02129374
Inspection points for the ATAAC
Inspect the exterior surface of the ATAAC for excessive buildup of dirt or debris. Also verify that the fins of the ATAAC are not damaged.Expected Result:There are no visible signs of buildup of dirt, debris, or damage to the ATAAC.Results:
OK - The surface of the ATAAC is not damaged and the ATAAC does not have an excessive buildup of dirt or debris. Proceed to Test Step 3.
OK - The surface of the ATAAC is damaged or the ATAAC has an excessive buildup of dirt or debris.Repair: Clean the ATAAC, if necessary. If the ATAAC is damaged, replace the ATAAC.If the problem still exists, proceed to Test Step 3.Test Step 3. Check the Operation of the Cooling Fan
Verify that the engine's cooling fan is working properly. If the fan is belt driven, verify that the belt tension is adequate. Also, verify that the clutch is operating properly.If the fan is hydraulically driven, verify that there is no leakage around the motor and that the pressure for the fan is adequate. Expected Result:The fan drive system is working properly.Results:
Not OK - The fan drive system is not working properly.Repair: If the fan is belt driven, perform the necessary adjustments or perform any necessary repairs to the clutch or the belt tensioner. Refer to Testing and Adjusting for details.If the fan is hydraulically driven, repair any leaks that have been discovered. Ensure that the control system for the fan is operating properly. Refer to Troubleshooting, "Cooling Fan Control - Test" for details.STOP