Author Topic: afm wiring help  (Read 23605 times)

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Offline LC_TRX

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afm wiring help
« on: Aug 11, 2007, 04:09PM »
ok so, i have read through the wiki article on how to wire a rb25det afm to a ka24e but still have some Q's        http://www.antrx.com/smf/index.php?topic=5330

i have purchased what i assume is a rb25det afm off ebay yet it didn't come with the plug so i am now interrested in alternate ways to wire it up. the reason why i say i 'assume' is because there is a difference in the 'pin outs' on my afm and the one noss used. mine only has 3 pin outs, like the ka but noss' shows 5??

just wondering if this is going to cause a problem or have i been ripped off and not got a rb25det afm?

i would also like to know which pin out is meant to be the 5v and which is the 12v? (would the 5v be closest to the gauze?)

and lastly, what are spade terminals and is there any particular wire that should be used for this application?

hope you can understand what i mean lol  ::)
« Last Edit: Aug 11, 2007, 04:29PM by LC_TRX »

Offline Jono

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Re: afm wiring help
« Reply #1 on: Aug 11, 2007, 06:47PM »
Is there provision for 5 pins? Is the plug wide enough to fit 5 pins in it, or only 3? If the plug looks like it could house 5 pins then use noss's diagrams, and just imagine there are pins where they're missing.

I'd go to the wreckers and find a plug that will fit your AFM, then solder it on to the existing wiring.

Spade terminals are an electrical connector, they look like this:
http://www.mikesxs.net/parts/img250/12-0023.jpg (male)
http://stude.vonadatech.com/images/Headlights/SolderedConnector.jpg (female)
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Offline chr1S

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Re: afm wiring help
« Reply #2 on: Aug 11, 2007, 06:55PM »
lol 3 outs ? are you sure you got a rb20/25 afm ?

mine has 5 out's and you can't solder onto them, you need the plug.
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Offline SSS

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Re: afm wiring help
« Reply #3 on: Aug 11, 2007, 09:15PM »
Ditto.

I had to buy my plug for my J30 maf from SSS Automotive second hand.

Offline Colby

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Re: afm wiring help
« Reply #4 on: Aug 11, 2007, 09:37PM »
Sure its not from a Q45... they only have 3 pins same as U12.  They look the same as RB ones too, except are 90mm, not 80mm.

what colour is the sticker on it?
I know RB20DET have green stickers, and Z32 have Orange, Q45 have Yellow.

Offline xxxx

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Re: afm wiring help
« Reply #5 on: Aug 11, 2007, 10:18PM »
i think VL/R31 skylines have the same plug as the RB25's? may not tho i just think i heard that somewhere
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Offline LC_TRX

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Re: afm wiring help
« Reply #6 on: Aug 12, 2007, 02:47AM »
well i have two 'rb25det' afm's and they both only have 3 prongs??? the colour of the sticker is actually pink on both...

ill post up some pics when im home and get my hands on the camera.

the problem with going to a wreckers is that i live in canberra and there arent many u12 lying around let alone performance parts for nissans. ive tried every wrecker in canberra and quenbeyan (NSW).


Offline chr1S

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Re: afm wiring help
« Reply #7 on: Aug 12, 2007, 02:52AM »
That's a series 2 rb25 afm, E60.

The one myself and SSS (im assuming here) are J60's, green sticker, series 1.
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Offline rathies

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Re: afm wiring help
« Reply #8 on: Aug 12, 2007, 01:27PM »
ca20 maf plugs DO fit z32 maf's  ;)  so theres some info. now the question is if the z32 is the same as the rb25???
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Offline chr1S

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Re: afm wiring help
« Reply #9 on: Aug 12, 2007, 01:54PM »
no it's not

z32 has pins coming out, where I could solder straight onto them, rb25 has holes (like a socket)

and LC, your rb25 afm the 3 pins are simply, 12v+, ground, 5v+
« Last Edit: Aug 12, 2007, 03:32PM by chr1S »
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Offline eurisko

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Re: afm wiring help
« Reply #10 on: Aug 12, 2007, 01:56PM »
U sure chris??

Where is the signal out coming from?  ???

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Offline rathies

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Re: afm wiring help
« Reply #11 on: Aug 12, 2007, 02:00PM »
yer he's sure. the maf he sold me (z32) has wires soldered straight onto the pins. so rb25 is different, false alarm.
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Offline chr1S

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Re: afm wiring help
« Reply #12 on: Aug 12, 2007, 02:34PM »
How do you mean Ed ?

The 5v+ is the variable voltage the maf is producing via the hotwire, 12v and ground is for power.
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Offline LC_TRX

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Re: afm wiring help
« Reply #14 on: Aug 12, 2007, 02:50PM »
You don't need a plug, you can solder onto the pins.

Find out what the pinouts are and wire them up accordingly.
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Offline LC_TRX

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Re: afm wiring help
« Reply #15 on: Aug 12, 2007, 03:02PM »
cheers chris,

how do i found out which is the 5v etc? i assume that trial and error probably isnt the best in this situation.

which wire should i use?

oh and why was it that the series one came out with 5 prongs and the series two with only 3?

Offline chr1S

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Re: afm wiring help
« Reply #16 on: Aug 12, 2007, 03:16PM »
Don't know, maybe they realised an extra ground for shielding was useless.

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« Last Edit: Aug 12, 2007, 03:30PM by chr1S »
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Offline LC_TRX

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Re: afm wiring help
« Reply #17 on: Aug 12, 2007, 05:46PM »
thanks mate, much appreciated.

can i just use wire from dick smith or something like that?

Offline chr1S

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Re: afm wiring help
« Reply #18 on: Aug 12, 2007, 05:47PM »
Any wire will do, find something similiar size to existing loom wiring.

If you are having trouble getting the wire on the pinout, bring the afm up with you when you come to pick your stuff up and i'll solder it on for you.
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Offline LC_TRX

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Re: afm wiring help
« Reply #19 on: Jan 16, 2008, 11:28AM »
ok so its old but i've only just got around to installing the afm.

ive got it in with the chip to suit and there are no air gaps after the pod filter. my problem is that when i turn the car over it idles very roughly at around 600 rpm. previously it was stalling after about 5 seconds but i fiddled with the wires and it now continues to idle (but as i said, very roughly).

the other problem is that it seems to have a 'rev limiter' of about 4500 rpm ???
i really need to fix this so any help would be appreciated.

Offline noss

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Re: afm wiring help
« Reply #20 on: Jan 16, 2008, 11:39AM »
sounds like its wired up incorrectly.. like 12v and ground the wrong way around, or 12v and 5v wrong way around.. or whatever other possible wiring combination there is.

this wiring diagram should help you, it shows a 3 pin air flow meter (right hand side of the image)



using that along with this info (ecu pin out listing):

http://paulr33.skylinesaustralia.com/diagrams/rb25det-pinout.pdf


someone please correct me if i've made a mistake but..

pin 1 = 12v
pin 2 = ground
pin 3 = 5v signal


double check that is how you have it wired up. make sure you're using different colour wires, i use red for 12v, black ground and yellow for 5v on my afm wiring. its far too easy to get wires mixed up if they're the same colour.
« Last Edit: Jan 16, 2008, 11:44AM by noss »

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Offline LC_TRX

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Re: afm wiring help
« Reply #21 on: Jan 16, 2008, 11:50AM »
ok so the idle seems to be fixed but it now has the standard 2500 rpm rev limit. is that a grounding issue?

Offline chr1S

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Re: afm wiring help
« Reply #22 on: Jan 16, 2008, 11:59AM »
Are you 100% on your joints on the AFM wiring?

Check the diagnostic and see if it spits out a code for the AFM.
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Offline LC_TRX

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Re: afm wiring help
« Reply #23 on: Jan 16, 2008, 12:12PM »
i dont have a consult cable  :'( chris, when you tried to solder the wire on to the afm that wouldnt have damaged the pin would it?

Offline noss

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Re: afm wiring help
« Reply #24 on: Jan 16, 2008, 12:24PM »
you dont need a consult cable.. just turn the dial on the ecu and the red light will flash when you fire the car up.

if the wires have been soldered to the afm, it could be cold solder joints or the solder/wires could be touching each other causing issues, its very tight in those sockets, i would never personally try to solder anything into a socket like that, but then i'm pretty nasty with a soldering iron.


edit: 2500rpm means its not getting the signal from the 5v wire.. you dont really have to put it in diagnostic mode to figure that one out.

edit #2: there is also the possibility you bought a faulty afm

edit #3: check the output voltage (on the 5v) with a multimeter
« Last Edit: Jan 16, 2008, 12:27PM by noss »

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Offline LC_TRX

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Re: afm wiring help
« Reply #25 on: Jan 16, 2008, 12:49PM »
the wires arent soldered on, it was tried on one pin but failed.

i;ve tried several different combinations of the wires and sometimes get it so it is difficult to start but wil happily rev to 5500 rpm. other times its the 2500 rpm limit (with a different wire setup that is)

i'll have a look at the diagnostics. its starting to really annoy me lol

edit: where abouts is the red light? oh and the car smells like its running very richly...
« Last Edit: Jan 16, 2008, 01:01PM by LC_TRX »

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Re: afm wiring help
« Reply #26 on: Jan 16, 2008, 01:08PM »
the wires arent soldered on

dare I ask, how are they attached?

read here for more info on how to get into diagnostic mode etc: http://www.antrx.com/smf/index.php/topic,4703.html

I believe the LED is on the actual ECU its self
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Offline LC_TRX

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Re: afm wiring help
« Reply #27 on: Jan 16, 2008, 01:13PM »
i found the red light but it only comes on when the accessories are on, not when the engine turns over.

the wires are attached by spade terminals to the afm and flattened spade terminals which slot into the loom.

Offline JelloBello

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Re: afm wiring help
« Reply #28 on: Jan 16, 2008, 01:16PM »
Did you follow the steps in the above link?
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Offline LC_TRX

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Re: afm wiring help
« Reply #29 on: Jan 16, 2008, 01:34PM »
just did it then, thanks jello. it comes up as (no surprise) the air flow meter.

edit: i definatley know that the wires are in the correct places but it still idles roughly and is running rich. does this mean that the afm is goneski?
« Last Edit: Jan 16, 2008, 01:53PM by LC_TRX »