The Engine Control Module (ECM) detects the following conditions:
- The C15 engine coolant temperature is greater than
109 °C (228 °F) for more than 10 seconds. - The C13 engine coolant temperature is greater than
107° C (225° F) for more than 5 seconds. - The engine has been running for at least 30 seconds.
System Response:
"DIAG" will be displayed next to the status for "Engine Coolant Temperature" on the Caterpillar Electronic Technician (ET). The check engine lamp and the warning lamp will illuminate.
Note: If a high coolant temperature lamp is installed, the high coolant temperature lamp will turn on instead of the warning lamp.
Customer passwords are required to clear this diagnostic code.
Possible Performance Effect:
The engine will be derated. The engine power and the vehicle speed will be limited. The amount of derate depends on the engine coolant temperature.
Note: If the "Engine Monitoring" parameter is programmed to "Warning", the engine power is not affected.
Troubleshooting:
Test Step 1. Check the Cooling System
Refer to Testing and Adjusting, "Cooling System - Check".
Results:
- OK - STOP