3500B Engines for 776D, 777D, 784C, 785C, 789C and 793C Off-Highway Trucks E021 High Exhaust Temperature Derate Caterpillar


E021 High Exhaust Temperature Derate
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Conditions Which Generate This Code:

The Electronic Control Module (ECM) detects the following condition:

  • Exhaust inlet temperature is greater than the default temperature of 750 °C (1382 °F) for five seconds.

  • The engine has been running for three 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 percent increments when the exhaust inlet temperature is above 750 °C (1382 °F) for five seconds up to a maximum derate of 25 percent. The Fuel limiting function will continue until the exhaust temperature returns below 740 °C (1364 °F). After the temperature returns below 740 °C (1364 °F) the derate due to a high exhaust temperature will be deactivated.

  • Low power

  • There may be an exhaust restriction.

  • There may be an air leak.

Test Step 1. Check for "ACTIVE" Diagnostic Codes

  1. Start the AVSpare Electronic Technician (ET).

  1. Turn the keyswitch to the ON position.

  1. Check for any active diagnostic codes or logged diagnostic codes.

Expected Result:

There are 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 Exhaust System

  1. Perform a check of the exhaust system. Refer to the diagnostic procedure 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

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