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#Discrepancy in ej20g ECU pinout/4 channel ignition

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 Post subject: Discrepancy in ej20g ECU pinout/4 channel ignition
PostPosted: Wed Nov 29, 2017 3:23 am 
Second Gear
Joined: Thu Oct 27, 2011 5:09 am
Posts: 436
Location: Dirt Roads, Colorado
Hey BBS,

Just a quick summary, I've completed a rebuild on my Impreza motor which is using a Rob tune ECU. In the recent rebuild I've converted my ignition system to COP from wasted spark.

When I went for first start up I wasn't able to get the car to run. It sounded clearly as though the firing was off.

Here is what I've concluded, that either the factory service manual is incorrect in the pin placement at the ECU of the ignition system, or in some case there is different pin placements on different ej20g ECU's.


I originally followed the Subaru FSM which has the ecu pin placement as follows:

Ignition #4 - pin 7 of 26
Ignition #3 - pin 8 of 26
Ignition #2 - pin 9 of 26
Ignition #1 - pin 10 of 26

1996 JDM ej20g ECU pinout picture:
Image

With no luck trying the Subaru FSM pinout and a bit of digging around I found a pinout diagram sent to me by Haltech. I noticed that the Haltech pinout differed from the Subaru pinout, so I gave it a try and sure enough got the car running on all four cylinders.

Haltech pinout as follows:

Ignition #4 - pin 7 of 26
Ignition #3 - pin 9 of 26
Ignition #2 - pin 8 of 26
Ignition #1 - pin 10 of 26

Haltech pinout picture:

Image

Sorry if this old news, but I didn't read anywhere of others facing this issue, unless I'm crazy, maybe, probably.

_________________
93 impreza rally muffin
93 legacy ss Tarmac Terminator
89 Nissan 240sx sr20
90 Nissan 240sx 2jz
killajamal wrote:
Dank is actually German for "silly term which the kids have come up with to describe exceptionally choice marijuana.''


Last edited by dankberries on Fri Dec 01, 2017 4:08 am, edited 1 time in total.

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 Post subject: Re: Discrepancy in ej20g ECU pinout
PostPosted: Wed Nov 29, 2017 5:30 am 
Moderator
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Joined: Tue Aug 25, 2009 7:52 am
Posts: 4591
Location: Des Moines, Wa
So output 2 and 3 are reversed in the FSM. Wouldn't be the first time the fsm was wrong. I remember a bunch of people attempting the COP swap going back since it ran poorly, or didn't run at all. Nice work

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1992 Legacy SS 5mt, reasonably modified ;)


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 Post subject: Re: Discrepancy in ej20g ECU pinout/4 channel ignition
PostPosted: Fri Dec 01, 2017 6:50 am 
Fifth Gear
Joined: Fri May 04, 2007 4:09 pm
Posts: 2238
Location: N. ID
Yeah...good work. :smt023

I wonder if the FSM would be for the following year? Was '96 a transition year for the JDM/EDM/AUDM versions? I have NO experience w/either COP nor the next gen of the EJ20xx ('96+ EJ20K ?).

But if the FSM's are translated, would that explain some of the errors? Or just 'human error'. :-)

NASIOC LINK w/some ECU stuff.

_________________
Turbo Subies:
'87 GL-10 Turbo 4WD Wagon (pre-Loyale) - SOLD
'90 BJ, EJ22T/DOHC and 5-speed swap - SOLD
'04 FXT, Forged internals, VF39, STI TMIC, Cobb AP- SOLD
'93 Legacy SS - 5-speed, SOLD :-(
'02 WRX GG-SOLD
'96 BD - turbo'd-SOLD


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 Post subject: Re: Discrepancy in ej20g ECU pinout/4 channel ignition
PostPosted: Sat Dec 02, 2017 3:09 am 
Second Gear
Joined: Thu Oct 27, 2011 5:09 am
Posts: 436
Location: Dirt Roads, Colorado
wtdash wrote:
Yeah...good work. :smt023

I wonder if the FSM would be for the following year? Was '96 a transition year for the JDM/EDM/AUDM versions? I have NO experience w/either COP nor the next gen of the EJ20xx ('96+ EJ20K ?).

But if the FSM's are translated, would that explain some of the errors? Or just 'human error'. :-)

NASIOC LINK w/some ECU stuff.


Sure, human error is viable, even more so after translation.

Looking at the pinouts for 96+ it would appear that everything is 2 channels that share 1&2 and 3/4. I don't believe the pinout is inaccurate too the ej20g, but the region is questionable.

Interestingly​ I've found a post from Rob (RobTune) that depicts a " wrx COP how to". In that write up there is a diagram showing the ignition signal wires leaving from the coils, going through an ignitor, and then to the ECU. In that diagram the ECU pin placement is as I've done.

In the post from Rob you can see that he has Illustrated the connectivity within the ignitor.

This is how it looks in the 1993-1996 F.S.M :
Image


Without seeing the routing within the ignitor it's difficult to say where the connections lead.



So really this just adds to the confusion. I don't believe that I'm interpreting the F.S.M diagram incorrectly but maybe so. Logic says I'm seeing it right. It's the ECU pinout that's most confusing.

If only Rob or Phyrra could chime in and clear the fog.

_________________
93 impreza rally muffin
93 legacy ss Tarmac Terminator
89 Nissan 240sx sr20
90 Nissan 240sx 2jz
killajamal wrote:
Dank is actually German for "silly term which the kids have come up with to describe exceptionally choice marijuana.''


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