HOUSING & REGULATOR GP 1586257 - Caterpillar

The Electronic Control Module (ECM) detects all of the following conditions:
The engine has been running more than three minutes.
Air inlet temperature is greater than 79 °C (174 °F) for more than four seconds.
172-03 is not active.
172-04 is not active.System Response:The ECM will log the diagnostic event. The ECM will derate engine power by three percent for each degree celsius above 79 °C (174 °F). The maximum derate is 20 percent of full power. The ECM will restore full power when the air inlet temperature falls to 77 °C (171 °F) for 20 seconds.Possible Performance Effect:
Low powerTroubleshooting:
There may be a problem with the aftercooler.
There may be a problem with the air inlet temperature sensor.Test Step 1. Check for Diagnostic Codes.
Connect the Caterpillar Electronic Technician (ET) to the service tool connector.
Place the engine control in the ON mode. The engine should be OFF.
Check Cat ET for any active diagnostic codes or logged diagnostic codes. Expected Result:There should be no diagnostic codes that are present.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Repair the diagnostic codes that are present. Refer to the appropriate topic in the "Troubleshooting With a Diagnostic Code" section of this manual.Ensure that the repair eliminates the problem.STOPTest Step 2. Perform a Check of the Aftercooler.
Perform a check of the aftercooler. Refer to the section on the aftercooler in Systems Operation/Testing and Adjusting. Expected Result:There are no problems with the aftercooler.Results:
OK - There may be an intermittent problem.Repair: Monitor the operation of the engine.Repair the problem.Ensure that the repair eliminates the problem.STOP
Not OK - Repair: Repair the problem.Ensure that the repair eliminates the problem.STOP