Help with the Mass Airflow sensor, new (used) sensor shows dentical results

[alan cordeiro]

OK guys, I am really puzzled now, I got in a used sensor from Chris Semple
and installed it into the lame 200q. No change, same behaviour as before.

I slowly went over ALL the diagnostic step by step. even disconnected the
Motronic and checked continuity of every wire between the sensor and
Motronic..... all checks out.

With the ignition ON there should be 1.2 to 1.5 volts across pins one and
three
of the sensor, I see only 0.01 volts. When the engine idles, it should be
around 2.5 volts, I still see 0.01 volts. Reving it up should produce 3 to 4
volts,
no change,

Bentley insists I should change the MAF sensor,..... but i just did!!
Either the second sensor is bad too, or the Motronic is bad,

Any ideas???? anyone close to me in Ann Arbor who would like to
volunteer a "running" MAF off their 3B or even urS4 to help me verify?

Thanks,

Alan Cordeiro
(734)-973-0790  or (734) 262-0979 cell, if you want to call



> I dumped the codes, the first was the one for the MAF sensor.
>
> I managed to "limp home" 35 miles on the freeway, and at home I checked
out the sensor
> using the rules from Bentley.  I have good voltage across pins one and
five, but nothing
> acorss pins one and three. (I do have 0.65 volts between one and four).
>
> Does anyone have a good source for a new/used mass airflow sensor????
>