C13 and C15 Engines for Combat and Tactical Vehicles Caterpillar

The Engine Control Module (ECM) detects the following conditions:

• The C15 engine coolant temperature is greater than 110 °C (230 °F) for more than 20 seconds.

• The C13 engine coolant temperature is greater than 111° C (232° 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 C15 engine will be derated by 25 percent for each 1 °C (1.8 °F) above 110 °C (230 °F) up to 100 percent.

The C13 engine will be derated by 25 percent for each 1 °C (1.8 °F) above 111° C (232° F) up to 100 percent.

A 100 percent derate means that the ECM will use a default torque map and vehicle speed will be limited to 72.4 km/h (45 mph).

Note: If the "Engine Monitoring" parameter is programmed to "Shutdown", the engine will be shut down once this code has been active for 25 seconds.

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