Rb26 - Stock Afm Voltages

[R31Nismoid]

When someone has some time... can you please check what voltages yours is reading

@ 1000-1100 rpm when warm, with no throttle input

Ive got a bung AFM, however not sure which one

Im getting the below via PFC

AFM 1: 0.8~1.1v

AFM 2: 1.2~1.4v

So i'm trying to workout which one is fked before i go pulling it all apart and save myself the hassle of pulling the working one out first

Car stalls when i pull both out too which is odd and not helping me check which one is playing up as ive done it previous and the car idled fine without load like it should.

Could also be loom which will be check #2 after i get another AFM over the weekend

Cheers all.

[Duncan]

I don't really understand. You said it stalls when you disconnect both (of course) but what if you disconnect just one?

generally if that doesn't tell you, give it a rev and the one that is slower to respond is the dying one.

[Ultimategtr]

hah, i just happened to have the workshop manual open at this time and skimming through it states that the voltages should be between 1-1.5v.. so does that mean the first one is out?

[R31Nismoid]

I don't really understand. You said it stalls when you disconnect both (of course) but what if you disconnect just one?

generally if that doesn't tell you, give it a rev and the one that is slower to respond is the dying one.

Ye i disconnect one (or the other) and it dies too... pain in the ass thing as it didnt do that with the other AFM's in there so i dunno. I think its running that bad before i pull the AFM out (on cold start) that it stalls as its just getting the really wrong signal

hah, i just happened to have the workshop manual open at this time and skimming through it states that the voltages should be between 1-1.5v.. so does that mean the first one is out?

fk... thats the hardest one to get too

Although thats a fair gap in volts... suppose they gotta allow for everything

Thanks for checking

[MrStabby]

Consult reports my ones at 0.9v and 1.1v - If you can log the output then that should tell you.

IIRC its supposed to run in a limp home mode if one of the AFMs is down (factory ECU, dunno about FC)

[VB-]

its not that hard to get to the top one is it? you need a new one anyway so buy one, replace the top one first, if it doesn't work, burn the car and claim insurance

[joeleo87]

Hey nismoid just wondering on how you went with the voltages?

i thought my problem was related to my loom but i was wrong. Ive just replaced my bottom AFM with a spare i borrowed of a mate, but my voltages are different? im not sure what they were before though.

so at the moment they read

@ ~ 1400RPM (cold start idle)

AFM1 = 1.20 ~ 1.23v

AFM2 = 1.06 ~ 1.10v

AFM2 is the "good 1" (if there is even such a thing as a good AFM)

AFM1 is the 1 i've borrowed of a mate.

now clearly those readings are no where near each other? and this is a problem?

just curious the hear what some1 "good AFMs" are reading?

Edited March 15, 2009 by joeleo87

[R31Nismoid]

My loom has arrived @ Nissan, i haven't picked it up yet though so i cant confirm 100%

However if yours isn't dropping below 1.05-1.10 then that i think is ok, mine drops below 0.80-1.00v and hence sometimes the PFC is thinking the AFM had died when i dont thin it actually has.

I should have the loom replaced in a week or two. PM me then... ill probably forget the thread is here haha

[joeleo87]

haha ok ill send ya a PM.

Still keen to see the voltages or other peoples AFMs to see if my discrepancy justifies a new set of AFMs.

lol sif i just bought a PFC, shoulda saved for a Djetro.

[joeleo87]

on further inspection, my AFM2 sometimes will get as low as 0.98v?

So below 1.00v and its will sometimes cut out?

god damn AFMs suck.

[R31Nismoid]

Well mine only drops off when it goes below .80v or there abouts (sometimes it drops below .60/.50 even before it has a tanty)