C4.4 Marine Generator Set Caterpillar

Use this procedure when the engine coolant level is repeatedly found to be low or any of the following diagnostic codes are active:

Table 1

Diagnostic Trouble Codes for Low Coolant Level
J1939 Code	Code Description	Comments
111-17	Engine Coolant Level : Low - least severe	The coolant level is low for 10 seconds with the engine running. The ECM has been powered for at least 2 seconds. There are no electrical faults or battery faults on the circuit.
111-18	Engine Coolant Level : Low - moderate severity	The coolant level is low for 10 seconds with the engine running. The ECM has been powered for at least 2 seconds. There are no electrical faults or battery faults on the circuit. The engine will be derated.
111-1	Engine Coolant Level : Low - most severe (3)	The coolant level is low for 60 seconds with the engine not running. The ECM has been powered for at least 2 seconds. There are no electrical faults or battery faults on the circuit. The engine will be derated.

Note: Diagnostic codes will only be present if a coolant level switch is installed.

Inspect the cooling system. Refer to Systems Operation, Testing, and Adjusting, "Cooling System - Test" for the correct procedure.