VALVE GP-RELIEF 4936928 - Caterpillar

Table 1
Diagnostic Trouble Codes    
CDL Code    J1939 Code    Description
(code descriptions may vary)    Comments    
E994 (2)         Low Crankcase Pressure     The Engine Control Module (ECM) activates this code when the crankcase pressure has been below the minimum value for a programmed time period. The amber warning lamp is illuminated. The code is logged. Engine power is derated.    
Illustration 1 g02211761
Typical crankcase ventilation system (1) Crankcase pressure sensor (2) Breather (3) Filter housing (4) Fumes disposal tube
Illustration 2 g02013955
Left side of the engine (5) Check valveProbable Causes
The oil fill cap is off.
The oil level gauge (dipstick) is not fully seated.
The vent filter for the crankcase is not installed.
The tube between the breather and the breather canister is not connected.The engine is equipped with an open crankcase ventilation system. Recommended Actions
Table 2
Troubleshooting Test Steps    Values    Results    
1. Engine Ventilation
A. Establish communication between Caterpillar Electronic Technician (ET) and the ECM. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
C. Inspect the engine. Look for the conditions that are listed above.
   
Ventilation
   
Result: The probable cause was found.
Make the necessary repairs.
Reset all active codes and clear all logged codes. Use Cat ET to verify that the problem is resolved.
   Complete the procedure in the order in which the steps are listed. 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).