COMPRESSOR 4744114 - Caterpillar

Table 1
Event Code    
Description    Conditions which Activate the Code    System Response    
E386(1) Low Engine Coolant or Engine Oil Level     The switch input for the engine coolant level or for the engine oil level is activated.     The code is logged. If a warning is generated, the alarm output is activated. If a shutdown is generated, the shutdown output is activated.    
E386(3) Low Engine Coolant or Engine Oil Level    Probable Causes
Low engine coolant level
Problem with an electrical connection or with the wiring
Problem with the coolant level switchRecommended Actions
Low Engine Coolant Level
Check the coolant level. Add coolant, if necessary.Normally, the engine does not consume any coolant. Inspect the cooling system for leaks.If no external leaks are found and the coolant level cannot be maintained, there may be an internal leak.Make repairs, if necessary.Electrical Connections or Wiring
There may be a problem with an electrical connection or with the wiring. Thoroughly inspect the electrical connectors and all of the wiring for the switch. Refer to Troubleshooting, "Electrical Connectors - Inspect" and refer to the engine's electrical Schematic. Make repairs, if necessary.Test the Switch
The coolant level switch must be closed in order for the engine to operate. The switch is normally open. The switch must be submerged in fluid in order to become closed.Disconnect the switch and remove the switch.Connect an ohmmeter to the switch's terminals and measure the continuity. The correct continuity for the normally open switch is greater than 20,000 Ohms.Continue to monitor the ohmmeter and submerge the switch in water. The correct continuity for the closed switch is less than 5 Ohms.If the correct results are not obtained or if the switch does not close, replace the switch.If the correct results are obtained, there may be an open circuit in an electrical connection or in the wiring. Use the ohmmeter to measure the resistance of the wiring. Refer to the engine's electrical Schematic. Make repairs, if necessary.Note: The coolant level switch may be supplied by the customer.