Hi, I am troubleshooting my 2000 Camry LE for CEL - code P0401. From scanner I know it is EGR related. I checked EGR valve by pulling vacuum directly and it is OK. So the problem is on modulator or VSV. I tried pull vacuum to the two ports on the VSV simultaneously to see if it could hold vacuum -according to one internet post. The vacuum would slowly drop to 0 in about 2 min. Does this mean the VSV is bad? Also how do I check the modulator is bad? I only have a small vacuum pump loaned from Autozone. Thanks!