COVER AS-CONTROL 4N0687 - Caterpillar

This procedure is only applicable to engines that have a coolant level sensor.This procedure covers the following diagnostic code:
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. Probable Causes
Low Coolant Level and/or Coolant Leakage
Coolant level sensorRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
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 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).