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
105 °C (221.0 °F) for more than four seconds. - 172-03 is not active.
- 172-04 is not active.
System Response:
The ECM will log the warning.
Possible Performance Effect:
- Low power
Troubleshooting:
- 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
- Turn the Engine Control Switch (ECS) to the OFF/RESET position.
- Connect the Caterpillar Electronic Technician (ET) to the service tool connector.
- Turn the ECS to the ON position. The engine should be off.
- Check for any active diagnostic codes or logged diagnostic codes.
Expected Result:
There are 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
- 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