3412 Generator Set Caterpillar

Use this procedure in order to troubleshoot a high coolant temperature or use this procedure if the following diagnostic code is active.

Table 1

Diagnostic Code
Description	Flash Code	Conditions which Generate this Code	System Response
110-00 High Coolant Temperature Warning	61	The coolant temperature is above the trip point.	The code is active and the code is logged.

Probable Causes

• Low coolant level and/or coolant leakage

• Insufficient flow of coolant through the engine

• Radiator (if equipped)

• Faulty radiator cooling fan (if equipped)

• Heat exchanger (if equipped)

• Faulty pressure relief valve

• Faulty temperature regulator

• Faulty water pump

• Load on the system

Recommended Actions

Table 2

Troubleshooting Test Steps	Value	Results
1. Check for Low Coolant Level and/or Coolant Leaks. A. Check the coolant level. B. Run the engine to operating temperature. Inspect the cooling system for leaks. Determine whether the leak occurs before the engine overheats.	Coolant	Result : The coolant level is OK. There are no leaks present. Proceed to Test Step 2. Result : The coolant level is NOT OK. There are leaks found. Repair : Add coolant, if necessary. If leaking is found, make the necessary repairs. If the problem is not resolved, proceed to Test Step 2.
2. Check the Flow of Coolant Through the Engine. A. During normal operation, check the inlet pressure of the engine coolant and the outlet pressure of the engine coolant. B. Measure temperatures and pressures at various points in the cooling system in order to identify possible locations of restrictions.	Coolant Flow	Result : The coolant flow is OK. Proceed to Test Step 3. Result : The coolant flow is NOT OK. Repair : If a buildup of deposits restricts the coolant flow, clean the cooling system. If the flow of coolant through the engine is not sufficient, determine the cause of the obstruction. Make necessary repairs. If the problem is not resolved, proceed to Test Step 3.
3. Check the radiator for damage. A. Check the cooling fins on the radiator for dirt and/or for debris. B. Check the cooling fins on the radiator for damage. C. Check the radiator for internal blockage. Check the temperature difference between the inlet and the outlet of the radiator.	Radiator	Result : The radiator is OK. Proceed to Test Step 4. Result : There is dirt and/or debris in the radiator. Repair : Remove the dirt and/or debris. Result : The fins on the radiator are NOT OK. Repair : Refer to the Systems Operation/Testing and Adjusting manual for instructions for testing and inspecting the cooling system. Result : The radiator has internal blockage. Repair : Repair and/or replace the radiator. If the problem is not resolved, proceed to Test Step 4.
4. Check for a Faulty Cooling Fan, If Equipped. A. Check for proper operation of the cooling fan.	Cooling Fan	Result : The cooling fan is OK. Proceed to Test Step 5. Result : The cooling fan is NOT OK. Repair : Repair and/or replace the cooling fan. If the problem is not resolved, proceed to Test Step 5.
5. Check for Insufficient Flow of Air and Coolant Through the Heat Exchanger (if equipped). A. Measure the coolant temperature at the inlet for the coolant. B. Check for sufficient flow and temperature of the cooling water through the heat exchanger. If the flow of cooling water through the heat exchanger is insufficient, determine the location of the obstruction.	Heat Exchanger	Result : The air and coolant flow through the heat exchanger is OK. Proceed to Test Step 6. Result : The air and coolant flow through the heat exchanger is NOT OK. Repair : Locate and repair the obstruction. If the problem is not resolved, proceed to Test Step 6.
6. Check the Operation of the Pressure Relief Valve and Radiator Cap. A. Check that the seating surface of the valve is clean and undamaged.	Pressure Relief Valve Radiator Cap	Result : The pressure relief valve and radiator cap are OK. Proceed to Test Step 7. Result : The pressure relief valve and radiator cap are NOT OK. Repair : Clean the pressure relief valve and/or the radiator cap, if necessary install new parts. If the problem is not resolved, proceed to Test Step 7.
7. Check the Water Temperature Regulators for Correct Operation.	Water Temperature Regulators	Result : The water temperature regulators are OK. Proceed to Test Step 8. Result : The water temperature regulators are NOT OK. Repair : Repair and/or replace the water temperature regulators. If the problem is not resolved, proceed to Test Step 8.
8. Check for a Faulty Water Pump. A. Measure the coolant pressure at the outlet of the water pump. B. Make sure that the water pump is in good condition. Inspect the impeller vanes at the jacket water pump for damage and/or for erosion.	Water Pump	Result : The water pump is OK. Proceed to Test Step 9. Result : The water pump is NOT OK. Repair : Repair impeller vanes and/or replace the impeller vanes. If the problem is not resolved, proceed to Test Step 9.
9. Check for Engine Overload.	Engine Load	Result : The engine load is too much for the design. Repair : Reduce engine load.