C9.3 Marine Auxiliary and Generator Set Engine Caterpillar

The engine is equipped with a closed crankcase ventilation (CCV) system. Refer to Illustration 2. The pressure sensor monitors the level of crankcase pressure. The CCV system contains a filter element (if equipped). Tubing routes the blowby from the CCV system to the filter housing (if equipped). The filter housing (if equipped) contains a filter element. The filter element filters the blowby. Refer to the Operation and Maintenance Manual for the replacement of the filter.

Table 1

Diagnostic Trouble Codes
J1939 Code and Description	Comments
101-15 Engine Crankcase Pressure : High - least severe (1)	The crankcase pressure is higher than the trip point and the delay time has expired. The code is logged.
101-16 Engine Crankcase Pressure : High - moderate severity (2)	The crankcase pressure is higher than the trip point and the delay time has expired. Engine power is derated. Engine power is derated. The code is logged.

Troubleshooting Procedure

Reset all active codes and clear all logged codes.

Illustration 1	g03806104
(1) Crankcase Filter housing (If Equipped) (2) Fumes Disposal Tube

Illustration 2	g03806044
(3) Crankcase Pressure Sensor (4) Oil Drain Tube

Illustration 3	g06213438
Left-Hand Side (5) Check Valve

Probable Causes

• Engine oil level

• Plugged CCV system

• Faulty check valve

• Faulty sensor

• Worn engine components

Recommended Actions

Complete the procedure in the order in which the steps are listed.

Table 2

Troubleshooting Test Steps	Values	Results
1. Check the Engine Oil Level	Engine Oil Level	Result: The engine oil level is OK. Proceed to Test Step 2. Result: The engine oil level is high. Repair: Troubleshoot the cause of the incorrect oil level. If the problem is not resolved, proceed to Test Step 2.
2. Plugged CCV System A plugged CCV system will cause excessive crankcase pressure. A. Check the CCV for plugging.	Plugged CCV	Result: The CCV is not plugged. Proceed to Test Step 3. Result: The CCV is plugged. Repair: Replace the fumes disposal filter (if equipped) according to the Operation and Maintenance Manual, "Fumes Disposal Filter Element - Replace". If the problem is not resolved, proceed to Test Step 3.
3. Faulty Check Valve A faulty check valve can cause excessive crankcase pressure. A faulty check valve will not allow the crankcase to vent properly. A. Replace the check valve.	Check Valve	Result: The check valve was replaced. Verify that the problem is resolved. If the problem is not resolved, Proceed to Test Step 4.
4. Plugged Oil Disposal Tube A plugged disposal tube will not allow the crankcase to vent properly. A. Check the disposal tube for obstructions.	Plugged Oil Disposal Tube	Result The oil disposal tube is not obstructed. Proceed to Test Step 5. Result The oil disposal tube is obstructed. Repair: Clean any obstructions from the tube. If the problem is not resolved, proceed to Test Step 5.
5. Faulty Sensor A. Connect Caterpillar® Electronic Technician (Cat ET) to the service tool connector. B. Turn the keyswitch to the ON position. Do not start the engine. C. Remove the oil filler cap. D. Monitor the crankcase pressure in Cat ET.	Crankcase Pressure Sensor	Result The crankcase pressure reading is 0 kpa (0 inH2O) ± .5 kpa (2 inH2O). Proceed to Test Step 6. Result The crankcase pressure reading is not 0 kpa (0 inH2O) ± .5 kpa (2 inH2O). Repair: Replace the crankcase pressure sensor. If the problem is not resolved, proceed to Test Step 6.
6. Internal Engine Problem Damaged pistons or rings can cause too much pressure in the crankcase. This condition will cause the engine to run rough. There will be more than the normal quantity of fumes (blowby) entering the CCV system. The CCV system can then more quickly become restricted, causing oil leakage at gaskets and seals that would not normally have leakage. Blowby can also be caused by worn valve guides or by a failed turbocharger seal. A. To determine whether the piston rings leak, measure the crankcase blowby. Use the following service tools, along with Software License, NETG5044: 1. 285-0900 Blowby Tool Gp (SMALL ENGINE) 2. 348-5430 Multi-Tool Gp	Damaged or Worn Engine Parts	Result There are worn or damaged engine parts. Repair: Repair or replace the worn or damaged parts. 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).