ELBOW 1164663 - Caterpillar

Use this procedure to troubleshoot a high crankcase pressure. Also, use this procedure if one of the following event codes is active or logged.
Table 1
J1939 Code and Description CDL Code and Description Comments
101-0
Engine Crankcase Pressure : High - most severe (3) E101 (3)
High Crankcase Pressure The engine crankcase pressure is higher than a threshold.
101-15
Engine Crankcase Pressure : High - least severe (1) E101 (1)
High Crankcase Pressure The engine crankcase pressure is higher than a threshold.
101-16
Engine Crankcase Pressure : High - moderate severity (2) E101 (2)
High Crankcase Pressure The engine crankcase pressure is higher than a threshold. Probable Causes
Oil level
Crankcase breather
Sensor
Connectors and wiring
Worn engine componentsRecommended Actions
Table 2
Troubleshooting Test Steps Values Results
1. Check the Engine Oil Level
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. Check for a Plugged Crankcase Breather
Note: If the engine is running in cold ambient temperatures, check to ensure that the breather tube is not plugged with ice.
Plugged Breather
Result: The crankcase breather is not plugged.
Proceed to Test Step 3.
Result: The crankcase breather is plugged.
Repair: Replace the crankcase breather.
Note: A plugged crankcase breather can cause the crankshaft seal to leak. Sealing of the piston rings can be lost and the increase in crankcase blowby will increase the crankcase pressure.
If the problem is not resolved, proceed to Test Step 3.
3. Check the Crankcase Pressure Sensor
A. Connect Cat® Electronic Technician (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. Use Cat ET to monitor the following pressure:
- Crankcase pressure
Sensor
Result: The crankcase pressure is within 0 1 kPa (0 4inch of H2O) of 0 with the keyswitch in the ON position.
Proceed to Test Step 5.
Result: The crankcase pressure is not within 0 1 kPa (0 4inch of H2O) of 0 with the keyswitch in the ON position.
Proceed to Test Step 4.
4. Inspect the Electrical Connectors and the Wiring
A. Turn the keyswitch 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 5.
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 5.
5. Inspect for an Internal Engine Problem
Note: Damaged pistons or rings can cause too much pressure in the crankcase. This condition will cause the engine to run rough. The quantity of fumes (blowby) entering the CCV system will be above normal. The CCV system can become restricted quicker, which can cause oil leakage at