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

Oil Filter Differential Pressure Problem

Usage:

Use this procedure in order to troubleshoot abnormal oil filter differential pressure or use this procedure if one of the following event codes is active.

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Table 1
Event Codes
Code and Description	Conditions which Generate this Code	System Response
99-15 Engine Oil Filter Differential Pressure : High - least severe (1)	The difference between the filtered oil pressure and the unfiltered oil pressure is greater than the trip point pressure.	The code is logged. The ECM may derate the engine or shutdown the engine.
99-0 Engine Oil Filter Differential Pressure : High - most severe (3)
E073(1) High Oil Filter Differential Pressure - lease severe	The difference between the filtered oil pressure and the unfiltered oil pressure is greater than the trip point pressure.	The code is logged. The ECM may derate the engine or shutdown the engine.
E073(2) High Oil Filter Differential Pressure - moderate severity
E073(3) High Oil Filter Differential Pressure - most severe

Probable Causes

Oil filter
Oil pressure sensor circuit
Oil filter bypass valve

Recommended Actions

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

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Table 2
Troubleshooting Test Step	Value	Result
1. Plugged oil filter or faulty oil filter A. manually check the oil filter differential pressure. If the oil filter differential pressure is too high, change the oil filter elements.	Oil Filter	Result: After starting the engine, the event code is no longer active for the filter that was changed. STOP Result: After starting the engine, the event code remained active for the filters that were changed. Proceed to the Test Step 2.
2. Oil pressure sensors and/or circuits A. Do not start the engine. Use the Caterpillar Electronic Technician (ET) to compare the readings of the "Unfiltered Oil Pressure (abs)" and the "Engine Oil Pressure (abs)".	Sensor circuit	Result: Both sensors read atmospheric pressure while the engine is off. Proceed to the Test Step 3. Result: A sensor does not read atmospheric pressure while the engine is off. Repair: Troubleshoot the sensor circuit. Refer to Troubleshooting, "Sensor Signal (Analog, Active) - Test". Verify that the repair eliminated the problem.
3. Oil Filter Bypass Valve An oil filter bypass valve that is stuck in the closed position can cause a high reading for differential pressure when the oil is cold. An oil filter bypass valve that is stuck in the open position can cause a low reading for differential pressure when the oil is hot. A. Determine if the valve is stuck.	Filter bypass valve	Result: The bypass valve is OK. STOP Result: The bypass valve is not OK. Repair: Repair the valve or replace the valve. 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).