I really like the EHA current for this mixture correction. The reason is that whatever happens, happens at the EHA.

I am pretty certain your above steps are about to screw with you. I'm a little fuzzy here but certain cars and I think yours might be one of them require the pin#3 diagnostic to be turned on from the other diagnostic connection by the battery.

If you have one of those models you will get a zero reading I think till its turned on. The EHA is still working during these situations so it is always useable.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician