This condition indicates that the coolant level is low. "Engine Monitoring" must be programmed to "WARNING", "DERATE", or "SHUTDOWN", and the parameter "Coolant Level Sensor" must be programmed to "4-pin" or "2-wire Float Sensor" before this diagnostic code can occur.
Note: This diagnostic code represents an event. This diagnostic code does not represent an electronic system fault.
System Response:
Electronic System Response The ECM does not derate the power. Also, the ECM does not limit the engine rpm or the vehicle speed due to this diagnostic code.
The Check Engine Lamp will flash and the Warning Lamp will illuminate.
This diagnostic code requires a Customer Password in order to be cleared.
Service Tool Display or Lamps The Caterpillar Electronic Technician (Cat ET) will indicate "LOW" and "DIAG" next to "Engine Coolant Level"on the status screen while the diagnostic code is active.
Engine Response This diagnostic code does not affect engine power.
Test Step 1. Check the Level of the Coolant
Visually check the level of the coolant. Ensure that the coolant level switch is fully immersed in the coolant.
Expected Result:
The coolant is at the proper level.
Results:
- OK -
Repair: If a problem with the coolant level sensor is suspected, refer to Troubleshooting, "Coolant Level Sensor Circuit - Test".
Stop.
- Not OK -
Repair: Fill the cooling system with the proper coolant to the correct level. For further information, refer to the Operations and Maintenance Manual.
Stop.