C4.4 Marine Generator Set Caterpillar

Oil Temperature Is High

Usage:

C4.4 NRP

The Electronic Control Module (ECM) monitors the engine oil pressure. The following codes are associated with low engine oil pressure:

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Table 1
Diagnostic Codes for High Engine Oil Temperature
J1939 Code	Code Description	Comments
175-15	Engine Oil Temperature 1 : High - least severe (1)	The ECM detects that the engine oil temperature has exceeded 115° C (239° F). The ECM has been powered for at least 2 seconds. The engine has been running for at least 10 seconds. There are no diagnostic trouble codes for the oil temperature sensor. There are no diagnostic trouble codes for the 5 VDC supply.
175-16	Engine Oil Temperature 1 : High - moderate severity (2)	The ECM detects that the engine oil temperature has exceeded 120° C (248° F). The ECM has been powered for at least 2 seconds. The engine has been running for at least 10 seconds. There are no diagnostic trouble codes for the oil temperature sensor. There are no diagnostic trouble codes for the 5 VDC supply. The engine will be derated.
175-0	Engine Oil Temperature 1 : High - most severe (3)	The ECM detects that the engine oil temperature has exceeded 125° C (257° F). The ECM has been powered for at least 2 seconds. The engine has been running for at least 10 seconds. There are no diagnostic trouble codes for the oil temperature sensor. There are no diagnostic trouble codes for the 5 VDC supply. The engine will be derated.

Probable Causes

Engine Oil level
Engine oil specification
Oil temperature sensor
Engine Oil Cooler
Engine Coolant Temperature

Recommended Actions

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

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Table 2
Troubleshooting Test Steps	Values	Results
1. Low Engine Oil Level A. Check the engine oil level in the crankcase. Refer to the Operation and Maintenance Manual. If the oil level is low, the return oil does not cool sufficiently before being pumped back into the hot engine.	Oil level	Result: The engine oil level is low. Add engine oil in order to obtain the correct engine oil level. Refer to Operation and Maintenance Manual, "Engine Oil" for the recommendations of engine oil. Start the engine. Inspect the exterior of the engine for oil leaks. Repair any oil leaks. Result: The engine oil is not low. Proceed to Test Step 2.
2. Check the Engine for the Correct Engine Oil A. Check that the engine contains oil of the correct specification. For the correct engine oil to use, refer to the Operation and Maintenance Manual.	Oil specification	Result: The engine has the correct engine oil. Proceed to Test Step 3. Result: The engine does not have the correct engine oil. Replace the engine oil with the correct engine oil.
3. Verify the Oil Temperature A. Check the actual engine oil temperature with a calibrated test gauge. Compare the oil temperature reading from Caterpillar Electronic Technician (ET) to the reading on the test gauge.	Oil temperature	Result: The test gauge does not match the temperature reading from Cat ET. Replace the oil temperature sensor. Result: The test gauge matches the temperature reading from Cat ET. Proceed to Test Step 4.
4. Restriction in the Engine Oil Cooler Core A. Check the engine oil cooler core for damage and for plugging.	Oil cooler	Result: The engine oil cooler is not plugged or damaged. Proceed to Test Step 5. Result: The engine oil cooler is plugged or damaged. Repair or replace the engine oil cooler.
5. High Engine Coolant Temperature A. Check for high engine coolant temperatures.	Coolant temperatures	Result: The engine coolant temperature is high. Refer to the symptom Troubleshooting, "Coolant Temperature Is High". Result: The engine coolant temperature is normal. Contact the Technical Communicator at a Cat dealer.