3406E, C-10, C-12, C-15, C-16 and C-18 On-highway Engines Caterpillar

The ECM detects the following conditions:

• The engine coolant temperature is greater than 106 °C (223 °F) for the C-10 or C-12.

• The engine coolant temperature is greater than 111 °C (232 °F) for the 3406E, C-15, C-16 and C-18.

• 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 (Cat ET). The check engine lamp and the warning lamp will illuminate.

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.

The engine will be derated to the default torque map and vehicle speed will be limited to 72 km/h (45 mph).

Note: If the "Engine Monitoring" parameter is programmed to "Shutdown", the engine will be shutdown once this code has been active for 20 seconds.

Note: If the "Engine Monitoring" parameter is programmed to "Warning", the engine power is not affected.

Test Step 1. Check the Cooling System

Refer to Testing and Adjusting, "Cooling System - Check".

Results:

• OK - STOP