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Old 11-02-2017, 11:46 AM
romanbuhr romanbuhr is offline
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Join Date: Nov 2017
Posts: 1
Dear MB-Stars and Doug,
my name is Roman, I am from Germany and own a R129 and a W124.
I am sourcing/collecting some excellent and expensive replacements parts for these cars, so I bought 2x MAF Hotwire Sensors (the aluminium one with round, 5 PIN plug) and I dig out this post as I have the same problem as my predecessor: I would like to test the MAF. Unfortunately I dont have a M119 engine at place at the moment, so I go for an offline test with help of an air blower, a throttle body and an oscilloscope.

All what I need is the what to put on which PIN.
I have to say, that I did not fully understand the last post from MB Stars, so If somebody can be so kind, to tell me what to put on which pin?

I figured out, that PIN 1 is ground and that there may be PINS for the "Burn free" circuit of the hotwire. I assume, that there a 12Volts and 5 Volts PINS and at least one
signal-return wire to the LH control module.

PIN1: Ground
PIN2:
PIN3:
PIN4:
PIN5:

Any help would be aprreciated.
Thanks.

-Roman
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