Mechanics

HOW CAN I TELL IF MY EGR VACURM MODULATOR IS WORKING OR NOT.I THANK YOU

1996 Toyota Corolla

I have a PO401 code. I have checked egr valve with vacurm tester and it is holding vacurm.
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George R
May 28, 2012.



I would remove the valve and make sure you have vacuum and exhaust present at the valve.

You need to verify the solenoid is working correctly and if it is getting the correct signal from the pcm.

The modulator need to be checked as well but I would look at this last to make sure the rest of the system is working correctly.

Roy

ASEMaster6371
May 28, 2012.