Detroit Diesel GHG14 DDEC VI Engine Regeneration Troubleshooting

This is an instruction show you guide on how to do regeneration troubleshooting for Detroit Diesel GHG14 DDEC VI engine.


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Note : This diagnostic should be completed first for regeneration issues.

Verification: Verify Parked Regeneration Completes


1.Connect using DiagnosticLink ®  and then turn the ignition ON (key ON, engine OFF).

2.Using DiagnosticLink, check for fault codes. Are any Fuel System or Air System fault codes present?

2a Yes; troubleshoot those codes first.

2b No; Go to step 3.




During parked regeneration the exhaust gases will be extremely HOT and could cause a fire if directed at combustible materials. The vehicle must be parked outside.


Note : If the unit is in zone zero, the system will not initiate a parked regeneration without using DiagnosticLink.


3.Using DiagnosticLink, go to Service Routines/DPF System/Perform Parked Regeneration/Start. Does the regeneration start successfully by reaching at least 1,100 rpm?

3a Yes; let the regeneration continue to run and Go to step 4.

3b No; Regeneration – Unable to Start a Parked Regeneration


4.Does the regeneration end at any time without a fault code coming active?

4a Yes; Regeneration – Regeneration Ends Abruptly.

4b No; Go to step 5.


5.Using DiagnosticLink, monitor DOC inlet temperature. Does the DOC inlet temperature reach 280 °C (536 °F)?

5a Yes; Go to step 6.

5b No; Regeneration – DOC Inlet Temperature Unable to Reach HC Dosing Temperature .


6.Using the chart tab in DiagnosticLink, monitor DOC outlet temp and DOC Out Model Delay. After 30 minutes into the regeneration, is there a difference greater than +/- 55.5°C (100°F)?

6a Yes; Regeneration – DOC Outlet Temperature Unable to Meet Model Delay .

6b No; Go to step 7.


7.Using the chart tab in DiagnosticLink, monitor AS077: Fuel Cut Off Valve. At 30 minutes, does Fuel Cut Off Valve stay steady at 100%?

7a Yes; troubleshooting is complete.

7b No; stop the parked regen and start a DOC Face Cleaning service routine, found under Action – Aftertreatment. Let the routine run for one minute, then stop it. Start another parked regen and verify it completes successfully.


More repair cases for Detroit Diesel engines,please refer to:Detroit Diesel Engine Repair

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