3516B and 3516C Engines For MT4400D AC Off-Highway Trucks Caterpillar

Use this procedure in order to troubleshoot high coolant temperature or use this procedure if one of the following event codes is active.

Table 1

Event Codes
Code and Description	Conditions which Generate this Code	System Response
110-15 Engine Coolant Temperature : High - least severe (1)	The engine coolant temperature has exceeded the trip point and the delay time has expired.	The code is logged. The ECM may derate the engine or shutdown the engine.
110-16 Engine Coolant Temperature : High - moderate severity (2)
110-0 Engine Coolant Temperature : High - most severe (3)
E361(1) High Engine Coolant Temperature - least severe	The engine coolant temperature has exceeded the trip point and the delay time has expired.	The code is logged. The ECM may derate the engine or shutdown the engine.
E361(2) High Engine Coolant Temperature - moderate severity
E361(3) High Engine Coolant Temperature - most severe

Probable Causes

• Coolant Leakage

• Coolant Temperature Sensor

• Water Temperature Regulator and/or Pressure Relief Valve

• Radiator

• Engine Cooling Fan (if equipped)

• Coolant Pump

• Engine overload

Recommended Actions

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

Table 2

Troubleshooting Test Steps	Values	Results
1. Coolant A. Inspect the coolant level.	Engine coolant level	Result: The engine coolant level is OK. Proceed to Test Step 2. Result: The engine coolant level is not OK. Repair: Check the cooling system for leaks. Refer to Troubleshooting, "Coolant Level is Low" for additional information. Repair any leaks immediately. Check for air in the cooling system. Refer to Systems Operation/Testing and Adjusting, "Cooling System" for the correct procedure. Verify that the repair eliminated the problem.
2. Coolant Temperature Sensor and/or the Circuit A. Check the reading of the coolant temperature on Cat ET. The temperature should rise steadily as the engine is warmed. Ensure that the temperature is reasonable.	Coolant temperature sensor	Result: The temperature sensor is working properly. Proceed to Test Step 3. Result: The temperature sensor is not working properly. Repair: Troubleshoot the circuit and the coolant temperature sensor. Refer to Troubleshooting, "Sensor Signal (Analog, Passive) - Test". Verify that the repair eliminated the problem.
3. Water Temperature Regulator and/or Pressure Relief Valve A.. Pressure-test the cooling system. Refer to Systems Operation/Testing and Adjusting for the correct procedure. B. Check that the seating surfaces of the pressure relief valve and the radiator cap are clean and undamaged. C. Check operation of the pressure relief valve and/or the water temperature regulator.	Temperature regulator	Result: The pressure relief valve and/or the water temperature regulator are operating properly. Proceed to Test Step 4. Result: The pressure relief valve and/or the water temperature regulator are not operating properly. Repair: Clean the components and/or replace the components. Verify that the repair eliminated the problem.
4. Radiator A. Check the radiator fins for dirt, debris, and/or damage. B. Check for collapsed hoses and/or other restrictions. C. Check the radiator for internal blockage. Ensure that the radiator size is sufficient. An undersized radiator does not have enough area for the effective release of heat. An undersized radiator may cause the engine to run at a temperature that is higher than normal. The normal temperature is dependent on the ambient temperature.	Radiator	Result The radiator fins are not damaged and the radiator does not have an internal blockage. Proceed to Test Step 5. Result The radiator fins are damaged. Repair: Remove any dirt and/or debris and straighten any bent fins. Result The radiator has internal blockage. Repair: Remove the blockage. Verify that the repair eliminated the problem.
5. Faulty Engine Cooling Fan (if equipped) A. If the fan is belt driven, check for loose drive belts. A loose fan drive belt will cause a reduction in the air flow across the radiator. B. Check the fan clutch, if equipped. A fan clutch or a hydraulic driven fan that is not turning at the correct speed can cause improper air speed across the radiator core. The lack of proper air flow across the radiator core can cause the coolant not to cool to the proper temperature differential.	Fan belt or clutch	Result The fan belt is tensioned correctly. Proceed to Test Step 6. Result The fan belt is not tensioned correctly. Repair: Adjust the tension of the fan drive belt, if necessary. Refer to Operation and Maintenance Manual. Verify that the repair eliminated the problem. Result The fan clutch is operating correctly. Proceed to Test Step 6. Result The fan clutch is not operating correctly. Repair: Refer to Troubleshooting, "Cooling Fan Control - Test" for troubleshooting information. Verify that the repair eliminated the problem.
6. Inspection of the Coolant Pump A. Inspect the impeller of the coolant pump for damage and/or erosion. B. Make sure that the drive gear is not loose on the drive shaft of the coolant pump.	Coolant pump	Result The coolant pump is operating correctly. Proceed to Test Step 7. Result The coolant pump is not operating correctly. Repair: If necessary, replace the coolant pump. Refer to Disassembly and Assembly for the correct procedure. Verify that the repair eliminated the problem.
7. Engine Overload A. Determine if the engine is being overloaded. Note: When the engine is running in the lug condition, engine rpm does not increase with an increase of fuel. The lug condition can cause high cylinder temperatures. High cylinder temperatures can cause a high coolant temperature.	Load	Result The engine is not being overloaded. Result: The engine is being overloaded. Repair: Reduce engine load to an acceptable limit.

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).