3512E Tier 4 Final Engines for 785G Off-Highway Trucks Caterpillar

Coolant Level Is Low

Usage:

785G RTL

Use this procedure to troubleshoot a low coolant level. Also, use this procedure if one of the following event codes is active or logged.

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Table 1
J1939 Code and Description	CDL Code and Description	Comments
111-1 Engine Coolant Level : Low - most severe (3)	E2143 (3) Low Engine Coolant Level	The Electronic Control Module (ECM) may derate the engine or shutdown the engine. The code is logged.
111-17 Engine Coolant Level : Low - least severe (1)	E2143 (1) Low Engine Coolant Level	The ECM may derate the engine or shutdown the engine. The code is logged.
111-18 Engine Coolant Level : Low - moderate severity (2)	E2143 (2) Low Engine Coolant Level	The ECM may derate the engine or shutdown the engine. The code is logged.

Probable Causes

Codes
Coolant level

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Personal injury can result from hot coolant, steam and alkali.
At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns.
Remove filler cap slowly to relieve pressure only when engine is stopped and radiator cap is cool enough to touch with your bare hand.

Cooling System Conditioner contains alkali. Avoid contact with skin and eyes.

Recommended Actions

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Table 2
Troubleshooting Test Steps	Values	Results
1. Check for Codes A. Connect Cat^® Electronic Technician (ET) to the service tool connector. B. Look for active codes that are associated with the system for the event code.	Codes	Result: An associated code is active. Repair: Troubleshoot any associated codes before continuing with this test. Result: A code is active or logged. Proceed to Step 2.
2. Check the Coolant Level	Coolant Level	Result: The engine coolant level is NOT OK. Repair: Perform the following procedure: 1. Check for the correct mixture of antifreeze and water. Refer to Operation and Maintenance Manual for additional information. 2. Check the cooling system for leaks. Refer to Testing and Adjusting, "Radiator and Cooling System - Test" for additional information. Repair any leaks. 3. Check for air in the cooling system. Refer to Testing and Adjusting, "Radiator and Cooling System - Test" for additional information. Verify that the repair eliminated the problem.

If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).