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Table 1
J1939 Code and Description CDL Code and Description Comments
110-0
Engine Coolant Temperature : High - most severe (3) E361 (3)
High Engine Coolant Temperature The engine is shutdown.
The code is logged.
110-15
Engine Coolant Temperature : High - least severe (1) E361 (1)
High Engine Coolant Temperature The code is logged.
110-16
Engine Coolant Temperature : High - moderate severity (2) E361 (2)
High Engine Coolant Temperature Engine power is derated.
The code is logged. If the engine is shutdown due to a high coolant temperature, the power to the ECM must be cycled before the engine is restarted.Probable Causes
Codes
Coolant level
Leaks
Heat exchanger
Sensor
Connectors and wiring
Relief valve
Temperature regulators
Water pumpRecommended Actions
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Look for active codes that are associated with the system for the event code.
Codes
Result: An associated code is active.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: A code is active or logged.
Proceed to Test Step 2.
2. Check the Coolant Level
Coolant Level
Result: The coolant level is OK.
Proceed to Test Step 3.
Result: The coolant level is NOT OK.
Repair: Add coolant. Check for leaks.
If the problem is not resolved, proceed to Test Step 3.
3. Check the Cooling System for Leaks
A. Inspect the coolant for presence of bubbles.
Leaks
Result: No presence of bubbles and the cylinder liners are OK.
Proceed to Test Step 4.
Result: There is leakage and/or the cylinder liners are damaged.
Repair: Repair any leaks. Replace any damaged cylinder liners.
If the problem is not resolved, proceed to Test Step 4.
4. Check the Heat Exchanger for Problems
A. Check the cooling fins on the heat exchanger for dirt and for debris.
B. Check for sufficient flow and temperature of the cooling water through the heat exchanger.
C. Ensure that the size of the heat exchanger is sufficient.
Heat Exchanger
Result: The heat exchanger is OK.
Proceed to Test Step 5.
Result: A problem with the heat exchanger has been discovered.
Repair: If the temperature of the cooling water is too high, determine the cause. Clean the components or replace the heat exchanger.
If the problem is not resolved, proceed to Test Step 5.
5. Check the Coolant Temperature Sensor
Note: The sensor may be indicating an incorrect temperature that is within the normal range of the sensor.
A. Connect Cat ET.
B. Use Cat ET to monitor the following temperature:
- Coolant temperature
Note: The temperature should rise steadily as the engine is warmed.
C. Ensure that the temperature is reasonable.
D. Reference the reading to another temperature indicator when possible. Refer to Testing and Adjusting, "Testing the Cooling System" for additional information.
Sensor
Result: The temperature sensor is OK.
Proceed to Test Step 7.
Result: The temperature sensor is NOT OK.
If the problem is not resolved, proceed to Test Step 6.
6. Inspect the Electrical Connectors and the Wiring
A. Turn the main disconnect switch to the OFF position.
B. Thoroughly inspect the connectors. Refer to Troubleshooting, "Electrical Connectors-Inspect" for additional information.
C. Perform a 45 N (10 lb) pull test on the connector wires.
D. Check the harness for abrasions and pinch points.
Connectors and Wiring
Result: The connectors and wiring appear to be OK.
Repair: Replace the sensor.
If the problem is not resolved, proceed to Test Step 7.
Result: There is a problem with the connectors and/or wiring.
Repair: Repair or replace the connectors or wiring. Ensure that all the seals are properly in place and ensure that the connectors are coupled.
If the problem is not resolved, proceed to Test Step 7.
7. Inspect the Pressure Relief Valve
A. Pressure-test the cooling system. Refer to Testing and Adjusting, "Testing the Cooling System" for additional information.
B. Check that the seating surfaces of the pressure relief valve and the radiator cap are clean and undamaged.
Relief Valve
Result: The pressure relief valve and the radiator cap are operating correctly.
Proceed to Test Step 8.
Result: The pressure relief valve or the radiator cap is not operating correctly.
Repair: Clean or replace damaged pressure relief valve or the radiator cap.
If the problem is not resolved, proceed to Test Step 8.
8. Check the Water Temperature Regulators
Note: The water temperature regulators should not begin to open until jacket water reaches opening temperature for the regulators.
A. Allow the engine to cool and then start the engine. Check the hose at the outlet for the jacket water. If the hose is warm and normal operating temperature is not achieved yet, a regulator may be stuck open.
B. If the water temperature regulators are malfunctioning, check the water temperature regulators. Refer to Testing and Adjusting, "Testing the Cooling System" for additional information.
Regulators
Result: The temperature regulators are OK.
Proceed to Test Step 9.
Result: The temperature regulators are NOT OK.
Repair: Replace the water temperature regulators.
If the problem is not resolved, proceed to Test Step 9.
9. Inspect the Water Pump
A. Inspect the impeller of the water pump for damage or erosion.
B. Ensure that the drive gear is not loose on the drive shaft of the water pump.
Water Pump
Result: There was a problem with the water pump.
Repair: Repair or replace damaged water pump components.
Verify that the repair eliminated the problem.
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).