TUBE AS 2390228 - Caterpillar

Which Generate This Code:The ECM detects all of the following conditions:
Air inlet temperature is greater than 78 °C (172 °F).
172-03 "Intake Manifold Air Temp open/short to +batt" is not active.
172-04 "Intake Manifold Air Temp open/short to ground" is not active.System Response:The ECM will log the derate. The ECM will derate the engine to a maximum of 20 percent when the air inlet temperature reaches 88 °C (190 °F).
Low power
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 ET to the service tool connector.
Turn the keyswitch to the ON position.
Check 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 appropriate topic in Testing and Adjusting for possible causes.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