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4-pin AFM change on EDM B13 SR20DE NX100 - SOLVED

Posted: Sat Dec 25, 2010 3:34 am
by skylinegtrhr
I have to put SR20DET S14a AFM on B13 SR20DE nx100 which don't have cat or O2 sensor,

it have following pins:

White goes on (-) ECU pin 17
Orange goes on (+) ECU signal pin 16
Orange/blue goes on (+) 12V from ECCS relay

so I know what to do with those wires but
I have one more wire:
Red goes to ECU pin 26 which is only on non catalyst models

This is how did I connect them :

Image
is there some mistake?

With OEM AFM car is running OK but with S14a EDM SR20det AFM car is sometimes run OK but mostly it run terrible very rich (whatever I do with K-factor ) and start to make AFM error code also I have problem with instrument warning lamps which keep on lighting even when contact is off (this only hapend when S14a AFM is on)
S14A AFM was taken from know good working car.

Did anyone have experience with non catalyst B13 AFM?
Or should I strip this red wire and measure resistance between it and car ground and then put resistor between this pin and body ground?
Should I measure this until engine is working or not (is this resistance always same)?

Thanks in advance as engine is now in break in period but it's build with S14 SR20DET pistons and rods and GT28RS is waiting for mounting so we would after that need to put Z32 AFM, so it is necessary to deal this problem.

Re: 4-pin AFM change on EDM B13 SR20DE NX100

Posted: Sat Jan 08, 2011 5:56 am
by skylinegtrhr
Or should I strip this red wire and measure resistance between it and car ground and then put resistor between this pin and body ground?
I did like this and measure 3,6 K Oms in default position of OEM AFM trimer, and put 3,6 K Oms resistor between red wire and body ground( I get 3,64 K Oms resistance after connecting everything) and after K factor tweaking S14 AFM now works perfect .