809951453 Mercruiser KEY

Table 1
Diagnostic Trouble Codes
Code Description Comments
110-0 Engine Coolant Temperature is High
Coolant temperature is greater than or equal to 120° C (248° F)
EGR operation is restricted.
Engine Is Derated
523603-15 Over Heat Pre-Caution Coolant temperature sensor is normal
Coolant temperature is greater than or equal to 110° C (230° F) Probable Causes
Low Coolant Level and/or Coolant Leakage
Coolant Temperature Sensor
Water Temperature Regulator
Radiator
Engine Cooling Fan
Coolant Pump
Cylinder Head GasketRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 2
Troubleshooting Test Steps Values Results
1. Check the Engine Coolant Level.
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.
If the problem is not resolved, proceed to Test Step 2.
2. Check the Cooling System
A. Refer to Systems Operation/Testing and Adjusting, "Cooling System - Check (Overheating)"
Cooling System
Result: The cooling system is ok.
Proceed to Test Step 3.
Result: The cooling system is not ok.
Repair : Make the appropriate repairs.
If the problem is not resolved, proceed to Test Step 3.
3. 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 4.
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".
If the problem is not resolved, proceed to Test Step 4.
4. Water Temperature Regulator
A. Pressure-test the cooling system. Refer to Systems Operation/Testing and Adjusting for the correct procedure.
B. Check that the seating surfaces the radiator cap are clean and undamaged.
C. Check operation of the water temperature regulator. Refer to Systems Operation/Testing and Adjusting, "Water Temperature Regulator - Test"
Temperature Regulator
Result:The water temperature regulator is operating properly.
Proceed to Test Step 5.
Result: The water temperature regulator is not operating properly.
Repair : Clean the components and/or replace the components.
If the problem is not resolved, proceed to Test Step 5.
5. 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.
Radiator
Result: The radiator fins are not damaged and the radiator does not have an internal blockage.
Proceed to Test Step 6.
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.
If the problem is not resolved, proceed to Test Step 6.
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.
If the problem is not resolved, proceed to Test Step 7.
7. Faulty Cooling Fan
Use the following Step for Skid Steer Loaders, Multi-Terrain Loader, Compact Track Loaders, and Compact Wheel Loader:
A. If the fan motor is not turning, the engine ECM is not controlling the fan. Refer to Testing and Adjusting, UENR2330, "Gear Motor Fan - Test".
Use the following Step for Mini-Hydraulic Excavators:
B. Check the fan belt tension. Refer to Operation and Maintenance Manual.
Cooling Fan
Result: The cooling fan is operating correctly.
Result:
The cooling fan is not operating correctly.
Repair : Refer to Specifications, UENR2329, "Gear Motor (Fan, Demand)" and Testing and Adjusting, "Gear Motor (Fan) - Test".
Result: The cooling fan is not operating correctly.
Repair : Refer to Operation and Maintenance Manual, SEBU9004, "Belts - Inspect/Adjust/Replace"