C175 Oil&Gas Offshore Engine Caterpillar

DEF Does Not Purge

Usage:

Use this procedure to troubleshoot a Diesel Exhaust Fluid (DEF) system purge failure. Also, use this procedure if the following event code is active or logged.

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Table 1
J1939 Code and Description	CDL Code and Description	Comments
3362-31 Aftertreatment #1 DEF Dosing Unit Input Lines	E114 (2) Aftertreatment #1 DEF Dosing Unit Input Lines Not Purged	The DEF system has failed to purge.

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Table 2
Associated Codes
J1939 Code	CDL Code	Troubleshooting Procedure
6875-16	E930 (2)	Troubleshooting, "DEF Pressure Is High"
6875-18	E930 (1)	Troubleshooting, "DEF Pressure Is Low"

Probable Causes

Codes

Recommended Actions

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Table 3
Troubleshooting Test Steps	Values	Results
1. Check for Codes A. Connect Cat^® Electronic Technician (ET) to the service tool connector. B. Look for active codes that are associated with the system for the event code.	Codes	Result: An associated code is active. Repair: Troubleshoot any associated codes before continuing with this test. Result: A code is active. Proceed to Test Step 2.
2. Operate the Engine A. Turn the AC and DC breaker to the ON position. B. Start the engine. C. Run the engine to run until normal operating temperature is reached. D. Connect Cat ET. E. Use Cat ET to monitor the following: - "Aftertreatment System State" F. Check for codes when the "Aftertreatment System State" reads "Normal Dosing".	Codes	Result: A code is not active. Return to service. Result: A code remains active while running the engine and another code becomes active. Repair: Troubleshoot the code that came active while running the engine. 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).