HARNESS AS-ENGINE 2659391 - Caterpillar

Which Generate This Code:The ECM detects the following condition:
Exhaust inlet temperature is greater than 750 °C (1382 °F) for 60 seconds.
The engine has been running for 3 seconds.
The diagnostic codes CID-FMI 827-08 and CID-FMI 828-08 are not active.System Response:The ECM will log the event. The ECM derates the engine at 15 second intervals in 2% increments when the exhaust inlet temperature is above 750 °C (1382 °F) for 60 seconds up to a maximum derate of 20%. The Fuel limiting function will continue until the exhaust temperature returns below 750 °C (1382 °F) or until the maximum derate has been reached. After the temperature returns below 750 °C (1382 °F) the derate due to a high exhaust inlet temperature will be latched at the last derate level. The last level of derate will remain active until the ECM is reset by being powered down. If the exhaust inlet temperature exceeds the trip point for a second time the new derate will take effect from the previously established level of derate until the ECM is reset.
Low power
There may be an exhaust restriction.
There may be an air leak.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 - There are no diagnostic codes that are present. Proceed to Test Step 2.
Not OK - There are diagnostic codes that are present.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. Stop.Test Step 2. Perform a Check of the Cooling System.
Perform a check of the cooling system. Refer to Troubleshooting, "Exhaust Temperature is Too High" for possible causes.Expected Result:There are no problems with the exhaust system.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 - There is a problem with the exhaust system.Repair: Repair the problem. Ensure that the repair eliminates the problem. Stop.