C11, C13, C15, and C18 Industrial Engines Crankcase Pressure Is Low Caterpillar


Crankcase Pressure Is Low
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This procedure covers the following diagnostic trouble code:

Note: The following code may not be applicable for certain applications.

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 1g02211761

Typical crankcase ventilation system

(1) Crankcase pressure sensor

(2) Breather

(3) Filter housing

(4) Fumes disposal tube




Illustration 2g02013955

Left side of the engine

(5) Check valve

Probable 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 Cat® 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.

Repair: Make the necessary repairs.

Reset all active codes and clear all logged codes. Use Cat ET to verify that the problem is resolved.
   

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).

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