Code: P0401 Exhaust Gas Recirculation Flow Insufficient Detected
12-11-2005
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Code: P0401 Exhaust Gas Recirculation Flow Insufficient Detected Replaced the EGR Valve but am still getting the same code. I'm at my wit's end trying to diagnose and fix this problem can anyone help? My inspection is passed due and I've already received one ticket for the inspection sticker. This has been like this for almost a year.
Don
I've done all of the following already which I had found in another thread:
1) Reset the ECM/PCM
to do this you need to pull a fuse under the hood. Its the No. 6 ECU 15A
pull this fuse for 15 seconds and then reinsert it
2) Go for a test drive under the following conditions
No electrical load, Im assuming they mean no headlights, radio, etc etc
and decelerate from 55 mph for at least 5 seconds
3) Check for a temporary DTC with the HDS or a scan tool
Is Temperorary DTC P0401 indicated?
YES-Clean the intake manifold EGR port with throttle body/intake cleaner. Also clean the passage inside the EGR valve with throttle body/intake cleaner, or replace the EGR valve.
NO-Intermittent failure, go to step 4
4) Turn the ignition switch off
5) Disconnect the EGR valve 6P connector
6) Connect the battery positive terminal to EGR valve connector terminal No 4
7) Start the engine and let it idle, then connect the battery negative terminal to terminal No 6.
Did the engine stall or run rough?
YES-Intermittent failure, system is OK at this time
NO-Clean the intake manifold EGR port with throttle body/intake cleaner. Also clean the passage inside the EGR valve with throttle body/intake cleaner, or replace the EGR valve.
Don
I've done all of the following already which I had found in another thread:
1) Reset the ECM/PCM
to do this you need to pull a fuse under the hood. Its the No. 6 ECU 15A
pull this fuse for 15 seconds and then reinsert it
2) Go for a test drive under the following conditions
No electrical load, Im assuming they mean no headlights, radio, etc etc
and decelerate from 55 mph for at least 5 seconds
3) Check for a temporary DTC with the HDS or a scan tool
Is Temperorary DTC P0401 indicated?
YES-Clean the intake manifold EGR port with throttle body/intake cleaner. Also clean the passage inside the EGR valve with throttle body/intake cleaner, or replace the EGR valve.
NO-Intermittent failure, go to step 4
4) Turn the ignition switch off
5) Disconnect the EGR valve 6P connector
6) Connect the battery positive terminal to EGR valve connector terminal No 4
7) Start the engine and let it idle, then connect the battery negative terminal to terminal No 6.
Did the engine stall or run rough?
YES-Intermittent failure, system is OK at this time
NO-Clean the intake manifold EGR port with throttle body/intake cleaner. Also clean the passage inside the EGR valve with throttle body/intake cleaner, or replace the EGR valve.
Last edited by Donggie; 12-11-2005 at 08:43 PM.
12-12-2005
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Rep Power: 0 Thanks for the response. I've removed the whole throttle body and taken it apart to do some serious cleaning. I also relmoved the whole side where the EGR sits on top of so as to be able to clean the passages where the EGR would want to get flow to the Manifold. The only thing I've not checked is the manifold itselfl and the aluminum part between the manifold and the head where the injectors go. Any ideas anyone. I do appreciate the help.
Don
Don
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