Does someone know how the MAF is connected?

pablosqy

Member
:
mazdaspeed protege
hey guys!

im having a code p0103 and p0090

in p0090 i already check that selenoid is working fine... so i think problem is in fpr

but with p0103 im checking how ws manual says but im confused... ????

in this image (on ws manual) if you look at maf sensor B goes to 88 and C to main relay
circuitomaf_zps3b5bfabd.jpg


and in this image... that is talking about dtc p0103 above says that C goes to 88 and B to 77
maf_zpsea71f7a7.jpg


I was testing voltages from harness like it says down the image A B C but I got a measure of .5 with engine on... and was accelerating but it stays in .5-.7 and it supposed to be under 4.9V or close...

So I change to "B" and there I was getting good voltage... like 3.5-4.3 V

So! how it really goes??? A C B B C A ????

Doing step 5 of diagnostic procedure I have 1.29V turning ignition key to ON (engine OFF) :(
 
Do you know how a hot wire maf works? It's pretty simple. Look it up and you may be able to better understand what voltages to expect where.

http://en.wikipedia.org/wiki/Mass_flow_sensor#Hot_wire_sensor_.28MAF.29

Also, take a look at these instructions for adding a greddy e manage.


http://www.mazdas247.com/forum/attachment.php?attachmentid=9936&d=1076926577

Also, try checking the wire color at the harness in the engine bay and at the ecu connector. Should be the same wire, with a unique color.
 
I read it! And was helpful to understand how maf works... i didnt know it!

And in ws manual says wich is the highest voltage i have to spect... ill check harness near ecu cuz thats the only part that i miss to check...
 
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