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#How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU

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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Thu Jan 05, 2017 6:58 pm 
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RckyMtnLegacy wrote:
Legacy777 wrote:
Check out my ECU I/O spreadsheet.

viewtopic.php?f=19&t=53822

B48 pin 21 is for the coolant temp sensor and shouldn't be tied into the MAP sensor ground.


I am still confused by this when the write up explains to do this:

MAP ground (B48-5 ; Red) :: Merge with B48-21. B48-5 is used for the stock JDM EJ20G cat efficiency EGT sensor. Not having an the stock EGT sensor has zero impact on how the ECU runs. The EJ20G harness combines the MAP sensor ground with all other sensor grounds at B48-21.


I went back and looked at my spreadsheet and the wiring diagrams and the coolant temp sensor does tie into the sensor grounds inside the ECU....so I'm not sure why I said it shouldn't be tied into the MAP sensor ground. Sorry about that, please disregard.

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1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Thu Jan 05, 2017 7:36 pm 
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RckyMtnLegacy wrote:
Replaced the crank sensor wiring from the harness connector to the ECU. I have also printed out the USDM and JDM pinouts and am going through each terminal to match everything up. I would like to run a couple things by you and let me know if I need to move this to my build thread instead.

Are these the same thing just worded different? Left is USDM pinout and right is JDM pinout descriptions.


Please see below.

Self-Shutoff Control and POWER TO MAIN RELAY - Yes, based on the wiring they appear to be the same thing, just worded differently
IDLE SWITCH and TPS - Yes, based on the wiring they appear to be the same thing, just worded differently
IGNITION SWITCH and FUEL PUMP RELAY IGN - I can't find the connector B95 as it's called out in the table in the diagrams
POWER SUPPLY and MAIN RELAY IGN - I can't find this particular label in the table, which pin are you referring to?
BACK UP POWER SUPPLY and FUEL PUMP/IGN SWITCH - No, these are not the same. I'm going to have to look at these more to decipher things.

Other items I had questions with are:

I assume MAP on USDM pinout is considered BOOST PRESSURE in JDM pinout? - Yes, I agree.

What is TI MONITOR? USDM has one JDM does not - TI Monitor is some sort of factory diagnostic pin

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1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Thu Jan 05, 2017 8:07 pm 
Third Gear
Joined: Sun Aug 06, 2006 6:25 am
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IGNITION SWITCH and FUEL PUMP RELAY IGN - I can't find the connector B95 as it's called out in the table in the diagrams
POWER SUPPLY and MAIN RELAY IGN - I can't find this particular label in the table, which pin are you referring to?B43 CONNECTOR TERMINAL 2 in EJ20G pinout

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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Thu Jan 05, 2017 8:41 pm 
Third Gear
Joined: Sun Aug 06, 2006 6:25 am
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Location: Littleton, CO
And it's called MAIN RELAY IGNITION B48 pin 2 on USDM ECU

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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Thu Jan 05, 2017 8:59 pm 
Third Gear
Joined: Sun Aug 06, 2006 6:25 am
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Location: Littleton, CO
Found b95 in center of page 18 near where it says Engine control module and I believe it's b12 Y

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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Fri Jan 06, 2017 6:54 pm 
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Ok....I've got to take a step back on this.

There are two separate wiring diagrams in there, the JDM and UK. Which wiring diagrams are you using? I'm not quite sure how'd you be able to use a combination of both, but that seems like what is happening. If you can provide a little more guidance on what you're looking at, that'd be helpful.

Thanks

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Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Fri Jan 06, 2017 7:06 pm 
Third Gear
Joined: Sun Aug 06, 2006 6:25 am
Posts: 702
Location: Littleton, CO
Really the help I need is:

Do I just do the steps in the first page and the ECU should start this car? I am trying to trace every wire to make sure the 2C ECU I have will run my EJ20G. I am getting no spark at all but followed the steps to get each coil a wire directly from the ECU, each has 12v and grounded correctly.

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1994 Legacy Turbo Wagon (Aspen)--SOLD
1990 2.2l Legacy--RIP
Keeping the Legacy's Legacy

"Straight roads are for fast cars. turning roads are for fast drivers"


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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Sun Jan 08, 2017 10:07 pm 
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That unfortunately isn't something I can answer as I haven't done this work myself. I would assume that if the instructions state to do it a certain way and others have done it successfully it should be fine, however if yours is not working then yeah troubleshooting every wire is a good next step.

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1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Sat Jan 14, 2017 5:14 am 
Third Gear
Joined: Sun Aug 06, 2006 6:25 am
Posts: 702
Location: Littleton, CO
We are thinking the ECU is bad trying to Source One

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1994 Legacy Turbo Wagon (Aspen)--SOLD
1990 2.2l Legacy--RIP
Keeping the Legacy's Legacy

"Straight roads are for fast cars. turning roads are for fast drivers"


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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Sat Jan 21, 2017 9:25 pm 
Third Gear
Joined: Sun Aug 06, 2006 6:25 am
Posts: 702
Location: Littleton, CO
Got it going! Will have full explaination soon

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1994 Legacy Turbo Wagon (Aspen)--SOLD
1990 2.2l Legacy--RIP
Keeping the Legacy's Legacy

"Straight roads are for fast cars. turning roads are for fast drivers"


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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Fri Jan 27, 2017 8:24 pm 
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Awesome! Glad to hear it's working and looking forward to hearing what the resolution was.

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Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Sat Jan 28, 2017 2:35 am 
Third Gear
Joined: Sun Aug 06, 2006 6:25 am
Posts: 702
Location: Littleton, CO
Here is the main gist the crank sensor wiring was at fault. I had only one harness connector for the CS so I had to use what wiring was left of it. I bought 100ft of shielded 2 wire cable to bypass the harness wiring and go straight to the ECU. Still no start, cranked only. We checked all wiring and it seemed fine but could got no signal and injectors no pulse. From everything I could find and remembered the CS gets 5v reference from the ECU...but after a month of research I found out it doesn't which is good because we almost condemned the computer. The crank sensor only sends millivolts to the ECU. Once we found this out we went through the CS wiring and at the connector I made earlier I had used liquid electrical tape since it was so brittle. Come to find out liquid electrical tape has small bits of metal in it and when you need to send tiny volts any metal across the wires could cause signal to be disrupted. Once wires were fixed the car started, still has a rough idle and will die after a bit but it runs.

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1993 Legacy Turbo Sedan SadPanda
1994 Legacy Turbo Wagon (Aspen)--SOLD
1990 2.2l Legacy--RIP
Keeping the Legacy's Legacy

"Straight roads are for fast cars. turning roads are for fast drivers"


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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Sun Jan 29, 2017 4:48 am 
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That is quite the detective work, congrats on figuring it out and getting the car started again.

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Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Mon Jan 30, 2017 12:14 am 
Winestone Cowboy
Joined: Thu Mar 26, 2015 4:12 am
Posts: 333
Location: Lake Stevens WA
Just wanted to throw out there that I just finished my COP conversion and mainly thanks to this thread and a couple other bits of info around it was a success! Wanted to say thanks for all the ppl on here that put these posts on here for others to learn from(and not make the same mistakes) lol

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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Wed Jun 28, 2017 4:09 am 
Second Gear
Joined: Sat Mar 22, 2014 3:10 am
Posts: 465
Hey guys! About to attempt this soon and I was wondering if anyone knew where I could get some pigtails for the coils so I can plug directly in after I wire.

Thanks!


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 Post subject: Re: How-To: Convert To GD WRX Coil On Plug w/EJ20G ECU
PostPosted: Wed Jun 28, 2017 6:15 am 
Third Gear
Joined: Sun Aug 06, 2006 6:25 am
Posts: 702
Location: Littleton, CO
https://www.fastwrx.com/products/coil-p ... u-ej-motor

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1993 Legacy Turbo Sedan SadPanda
1994 Legacy Turbo Wagon (Aspen)--SOLD
1990 2.2l Legacy--RIP
Keeping the Legacy's Legacy

"Straight roads are for fast cars. turning roads are for fast drivers"


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