Posted on

C-10, C-12, C-15 and C-16 Industrial Engines – E025 High Inlet Air Temperature Derate

Conditions Which Generate This Code:

The inlet air temperature exceeded the trip level.

Table 1
Trip Level     Set Point (sec)     Reset Level     Reset Time    
79 °C (174 °F)     0 to 120 sec     77 °C (171 °F)     20 sec    

System Response:

The warning lamp will flash while the “Derate” is active.

The engine power is derated according to Table 2.

Table 2
Temperature     Derate Ramp Rate     Maximum Derate    
<
80 °C (176 °F)    		 1.0 % per sec     3.0%    
81 °C (178 °F)     6.0%
82 °C (180 °F)     9.0%
83 °C (181 °F)     12.0%
84 °C (183 °F)     15.0%
85 °C (185 °F)     18.0%
>
86 °C (187 °F)    		 20.0%
  • There may be a problem with the aftercooler.

Test Step 1. Check for Diagnostic Codes

  1. Connect Caterpillar Electronic Technician (ET) to the service tool connector.
  1. Place the engine control in the ON mode. The engine should be off.
  1. 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.

    STOP

Test Step 2. Perform a Check of the Aftercooler

  1. 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