Author Topic: afm wiring help  (Read 23608 times)

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Offline noss

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Re: afm wiring help
« Reply #30 on: Jan 16, 2008, 02:14PM »
ok, well if its plugged in correctly at the air flow meter end, are you 100% sure its plugged in the right way at the loom end? i made a mistake once and plugged them in backwards (ie i had the plug upside down)

get a multimeter and see what the voltage is on the air flow meter, it should be around 1 - 1.2v at idle.

its hard to tell whats going on without being there to look at it. there may be an issue with the chip but i normally do a verification on the write to make sure the data matches..


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Offline LC_TRX

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Re: afm wiring help
« Reply #31 on: Jan 16, 2008, 03:53PM »
ok so i went out and bought a multimeter, i absulotley have no idea about electronics in case you hadnt realised already.

im pretty sure that ive tested it all correctly and it seems like im not getting any reading from the ground on the loom. i find this strange as it was working with the standardn afm?? if this is the case (loom grounding is dead), is there anyway to fix it?

oh and is it dc voltage that is hould be testing for?
« Last Edit: Jan 16, 2008, 03:55PM by LC_TRX »

Offline LC_TRX

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Re: afm wiring help
« Reply #32 on: Jan 16, 2008, 04:38PM »
http://s163.photobucket.com/albums/t311/lctrx/?action=view&current=163.jpg

so from the picture above the wire on the left of the loom connects to the left of the afm, the midle of the loom connects to the right of the afm and the right of the loom to the middle of the afm. all positions are as you look at the photo.

from the fsm the loom should go as follows ground, 5V, 12V. the loom is upside down in the photo so looking at it from left to right it would be 12V, 5V and ground.

if this makes sense but isnt correct then someone please let me know.
« Last Edit: Jan 16, 2008, 04:40PM by LC_TRX »

Offline dave-trx

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Re: afm wiring help
« Reply #33 on: Jan 16, 2008, 04:49PM »
Get a plug that suits it. Someone said a CA20 plug will work.
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Offline JelloBello

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Re: afm wiring help
« Reply #34 on: Jan 16, 2008, 05:30PM »
To do what noss suggested (test the 5v output) do this:

1) Put the multimeter into dc voltage mode (yes you were right)
2) Touch the black (negative) probe to the ground wire on the afm
3) Touch the red (positive) probe to the +5v output of the afm

the reading should be 1-1.2v at idle (engine running of course)

also I'm not sure what you meant by "not getting any reading from the ground on the loom". How were you testing the ground?

To see if the ground is good:
1) leave the multimeter in dc voltage
2) place the positive probe on the positive battery pole
3) place the negative probe on the afm ground wire

it should read 12-14v (depending if the engine is running or not) - I'm fairly sure there is another "proper" way to test the ground but this will work fine :)
« Last Edit: Jan 16, 2008, 07:14PM by JelloBello »
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Offline LC_TRX

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Re: afm wiring help
« Reply #35 on: Jan 16, 2008, 07:44PM »
Get a plug that suits it. Someone said a CA20 plug will work.

unfortunatley the 5 prong plug is hard enough to find without buying the afm to go with it let alone finding a 3 prong plug!

i think i was doing it correctly but i will try agin according to your insructions (the ones from the packaging are never helpful lol)

thanks again guys. i'll give it another go tomorrow.

Offline noss

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Re: afm wiring help
« Reply #36 on: Jan 16, 2008, 08:39PM »
from the fsm the loom should go as follows ground, 5V, 12V. the loom is upside down in the photo so looking at it from left to right it would be 12V, 5V and ground.

there is your problem right there, ground is in the middle.. from the wiki - http://www.antrx.com/images/faqs/rb25detafm/rb25det-ka24e-afm.pdf

i'm certain i uploaded an updated version of that pdf that showed the notches in the loom plug.


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Offline chr1S

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Re: afm wiring help
« Reply #37 on: Jan 16, 2008, 08:55PM »
If it's not the above what noss said, check your timing with a timing light.

Mine was WAY too advanced and wouldn't idle properly, wouldn't rev and spat alot of black smoke out before Ed adjusted it from the dizzy and set it standard 15BTDC.
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Offline noss

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Re: afm wiring help
« Reply #38 on: Jan 16, 2008, 09:10PM »
i just looked at the wiring diagram in the fsm, and it does seem to indicate that the 12v is in the centre.. either way, give it a go with the ground in the centre, as i wouldnt have uploaded that pdf if it wasnt correct.

also just a comment, try to insulate the connectors from each other, it looks like the wires you have there are getting awful close to each other.


if you cant figure out how to use your multimeter, you can use a lightbulb to tell where 12v is.. put the car in the ignition position (ie the key) but dont start the car, run a wire from the afm plug loom 12v to the lightbulb and then from the lightbulb to the afm plug in the loom ground.

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Offline chr1S

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Re: afm wiring help
« Reply #39 on: Jan 16, 2008, 09:28PM »
LC, take the AFM to a computer/tv repair place and have them solder the wires onto the pin using heatshrink to isolate the wires from one another, you're definitely going to get a short one day, especially with all the vibration and moving the intake is doing.

I havn't had a look at what wires you've done, but try and use the similar to standard colours to save yourself getting confused. Did that picture I posted up with the wiring help? I used that when I had my RB25 AFM, but mine was those 6 pin or 5 pin ones.
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Offline LC_TRX

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Re: afm wiring help
« Reply #40 on: Jan 17, 2008, 02:51PM »
ok this still isnt working. the only problem that i can see now is that the 5v reading was weird, it came up saying - .7 or something similar to that. is that a negative??

the ecu is till spitting out error code 12 for the afm as well.
« Last Edit: Jan 17, 2008, 02:55PM by LC_TRX »

Offline chr1S

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Re: afm wiring help
« Reply #41 on: Jan 17, 2008, 04:23PM »
If the multimeter said minus then a voltage, you have polarity around the wrong way.

Can you confirm which wiring method you used? Post up exactly what you done.

Don't worry, I had headache's when I did my AFM mod as well, but I was extremely nooby then  :P
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Offline LC_TRX

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Re: afm wiring help
« Reply #42 on: Jan 17, 2008, 06:43PM »
ive tried to take it all out and put the in normal setup i had with the stock afm and the stage 3 chip. its now not running smoothly either???? i ran the diagnostics again and it also came up with the code 13 which is for the engine temperature sensor, this was done prior to the r33 afm been taken out.

i havent yet run diagnostic with stock setup

Offline chr1S

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Re: afm wiring help
« Reply #43 on: Jan 17, 2008, 07:15PM »
I'll ask my mate if it's a headache of me to drop by on sat morning on the way to melb.

I have a feeling it's something very simple.

Rough idle could be caused by a vacuum leak, have you checked for some?
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Offline LC_TRX

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Re: afm wiring help
« Reply #44 on: Jan 17, 2008, 09:51PM »
yeah i have checked for vaccuum leaks but that wouldnt explain why its running rich would it?

Offline chr1S

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Re: afm wiring help
« Reply #45 on: Jan 18, 2008, 11:43AM »
It can, err did you check the timing?

If you havn't adjusted the timing this shouldn't matter though. Hrm..
« Last Edit: Jan 18, 2008, 11:45AM by chr1S »
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Offline LC_TRX

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Re: afm wiring help
« Reply #46 on: Jan 18, 2008, 11:57AM »
i certainly don think that i have altered the timing... definatley not since the it was running perfectly.

Offline chr1S

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Re: afm wiring help
« Reply #47 on: Jan 18, 2008, 12:06PM »
Take pictures of your current intake setup and wiring.
Don't let the opinions of the average man sway you. Dream, and he thinks you're crazy. Succeed, and he thinks you're lucky. Acquire wealth, and he thinks you're greedy. Pay no attention. He simply doesn't understand.

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Offline LC_TRX

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Re: afm wiring help
« Reply #48 on: Jan 18, 2008, 12:17PM »
will do, im at work at the moment but at around 1530 (1430 antrx time)  i'll be home so i'll do it then.

chris- i've got to work tomorrow morning too so if you want to come by just let me know what time you think you'll be in town. up to you

Offline chr1S

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Re: afm wiring help
« Reply #49 on: Jan 18, 2008, 03:21PM »
Cheers, I can't come past tomorrow, it's not on the way for him =/
Don't let the opinions of the average man sway you. Dream, and he thinks you're crazy. Succeed, and he thinks you're lucky. Acquire wealth, and he thinks you're greedy. Pay no attention. He simply doesn't understand.

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Offline dozer

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Re: afm wiring help
« Reply #50 on: Feb 4, 2008, 05:15PM »
this may not relate, but my car was not running well at all. the afm had been just sitting around in the garage (like at a wreckers).
went and got me a can of crc afm cleaner and followed the instructions on the can and it is a different car.

would recommend it should you lot be buying second hand afm's.