WASHER 1D0503 - Caterpillar

Use this procedure to troubleshoot high coolant temperature or if one of the codes in Table 1 is active.
Table 1
Diagnostic Trouble Codes
CDL Code and Description Comments
E361(3)
Engine Coolant Temperature High - Most Severe (3) The engine coolant temperature has exceeded the trip point and the delay time has expired.
Engine power is derated.
The code is logged.
E361(1)
Engine Coolant Temperature High- Least Severe (1) The engine coolant temperature has exceeded the trip point and delay time has expired.
The code is logged.
E361(2)
High Engine Coolant Temperature High - Moderate Severity (2) The engine coolant temperature has exceeded the trip point and the delay time has expired.
The code is logged. Probable Causes
Low Coolant Level and/or Coolant Leakage
Coolant Temperature Sensor
Water Temperature Regulator and/or Pressure Relief Valve
Radiator
Heat Exchanger
Engine Cooling Fan (if equipped)
Coolant Pump
Cylinder Head GasketRecommended Actions
Table 2
Troubleshooting Test Steps Values Results
1. Inspect the Engine 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 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 within operating specifications.
Coolant Temperature Sensor
Result: The temperature sensor is OK.
Proceed to Test Step 3.
Result: The temperature sensor is NOT OK.
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 3.
3. Check the 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 OK.
Proceed to Test Step 4.
Result: The pressure relief valve and/or the water temperature regulator are NOT OK.
Repair: Clean the components and/or replace the components.
If the problem is not resolved, proceed to Test Step 4.
4. Inspect the 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.
Note: 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 depends on the ambient temperature.
Radiator
Result : The radiator is OK.
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.
If the problem is not resolved, proceed to Test Step 5.
5. Check the Heat Exchanger for Sufficient Flow
A. Check for sufficient flow and temperature of the cooling water through the heat