C7.1 Engines and Generator Sets Caterpillar

Coolant Level Is Low

Usage:

C7.1 770

This procedure is only applicable to engines that have a coolant level sensor.

This procedure covers the following diagnostic code:

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Table 1
Diagnostic Trouble Codes for Low Coolant Level
J1939 Code	CDL Code	Code Description (code descriptions may vary)	Comments
111-1	E2143-3	Engine Coolant Level : Low - Level 3	The engine has been running for 60 seconds. The engine coolant level has fallen below the coolant level sensor for the specified delay time. Engine power is derated. The code is logged.
111-18	E2143-2	Engine Coolant Level : Low - Level 2	The engine has been running for 60 seconds. The engine coolant level has fallen below the coolant level sensor for the specified delay time. Engine power is derated. The code is logged.

Note: The procedures have been listed in order of probability. Complete the procedures in order.

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Table 2
Troubleshooting Test Steps	Values	Results
1. Low Coolant Level and/or Coolant Leakage A. Inspect the coolant level.	Coolant level	Result: The engine coolant level is OK. Proceed to Test Step 2. Result: The engine coolant level is not OK. Repair: Troubleshoot the cause of the incorrect coolant level. Check for the correct mixture of antifreeze and water. Refer to Operation and Maintenance Manual. Check the cooling system for leaks. Refer to Systems Operation/Testing and Adjusting, "Cooling System - Test" for the correct procedure. Repair any leaks immediately. Check the NRS cooler for leaks. Refer to Testing and Adjusting, "Exhaust Cooler (NRS) - Test". Check for air in the cooling system. Refer to Systems Operation/Testing and Adjusting, "Testing the Cooling System" for the correct procedure.
2. Faulty Sensor A. If an electrical fault with the coolant level sensor is suspected, refer to Troubleshooting, "Coolant Level - Test" for information on troubleshooting the coolant level sensor.	Coolant level sensor	Result: The coolant level sensor is not operating correctly. Repair: Replace the coolant level sensor. Result: The coolant level sensor is operating correctly. Contact the Dealer Solutions Network (DSN).