SL ECU Major Differences or Why NOT to Use an SL ECU

[mb3000]

Subscribed.

[Drummer]

IDK, I wish this would get resolved because I've been told by a very reliable source that the circuitry is exactly the same.

He has seen many of these ecus open and has a reference ecu. I cant see a reason to say otherwise, cause its easy to take a look. I too have an sl ecu and can get access to a reference 99 ecu. Ill take his word that the sl may be a more sensetive circuit. If for some reason its not, ill see that later. The real work on this project is in the ecuflash file. Keep up the good work! Brett, when will the ecus be ready for sale?

[99 vr4]

I have the knock issue resolved.. I also have the timing issue resolved.. When the ecu is from a distributor based car.. I am working on the o2 circuits..

Basically the 3000 dohc na and turbo use 4 o2 sensors.. All others use two, one front and one rear. Modifying the circuit to use two front is the last major hurdle.. Right now the montero and diamante ecus are only reading the front bank o2 and we all know that is not ideal.. I should have it soon..

[99 vr4]

Also I have the reason why you see ghost o2 voltages when there are no sensors.. It's inerrant in the hard circuitry.. I will provide a more detailed explanation later

[99 vr4]

He has seen many of these ecus open and has a reference ecu. I cant see a reason to say otherwise, cause its easy to take a look. I too have an sl ecu and can get access to a reference 99 ecu. Ill take his word that the sl may be a more sensetive circuit. If for some reason its not, ill see that later. The real work on this project is in the ecuflash file. Keep up the good work! Brett, when will the ecus be ready for sale?

If you have 98/99 sl ecus I can modify them for the knock circuitry..

[Jesters Deadd]

I have the knock issue resolved.. I also have the timing issue resolved.. When the ecu is from a distributor based car.. I am working on the o2 circuits..

Basically the 3000 dohc na and turbo use 4 o2 sensors.. All others use two, one front and one rear. Modifying the circuit to use two front is the last major hurdle.. Right now the montero and diamante ecus are only reading the front bank o2 and we all know that is not ideal.. I should have it soon..

Yeah so I took the diamante ecu put it in my 99VR4 and tested the different O2 sensors readings. I was concerned about the missing O2 sensors on the diamante. Since I have two Lc1 wb o2s I can manipulate each of the 4 channels coming into the ECU. Well long story short the daimante ECu reads the front and rear upper (precat) o2 signals correctly. I couldn't really test the postcat o2 signals because I don't know the MUTIII readout for them.

also the 98/99 sohc 3000gt had four O2 sensors... so the 98/99 SOHC 3000gt would be better than the Diamante ECU. It would be the same as 98/99 SL ECU if the start timing issue is fixed.

[green-lantern]

Knock circuit layout

1998 3000GT SL 
MMC P/N MD347251
MFG P/N E2T61389 H3
PCB P/N JE331B157D

Con1-Pin 91 > R314 (TOP) > C45 (BOTTOM) > R315 (TOP) > IC2-Pin 78 < IC2-Pin 80 > IC1-Pin 92

R314 = 51 KOhm
C45 = 0.02 uF
R315 = 6.2 KOhm
IC2 = Mitsu Electronics E328 logic level converter
IC1 = Renesas H8/539F microcontroller, A/D input 6

1999 3000GT VR4
MMC P/N MD360163
MFG P/N E2T61495 H1
PCB P/N JE331B32804B

Con1-Pin91 > R71 (TOP) > C62 (BOTTOM) > R73 (TOP) > IC7-Pin 78 < IC7-Pin80 > IC9-Pin 92

R71 = 51 KOhm
C62 = 0.02 uF
R73 = 6.2 KOhm
IC7 = Mitsu Electronics E328 logic level converter
IC9 = Renesas H8/539F microcontroller, A/D input 6

[CoopKill]

I have the knock issue resolved.. I also have the timing issue resolved.. When the ecu is from a distributor based car.. I am working on the o2 circuits..

Basically the 3000 dohc na and turbo use 4 o2 sensors.. All others use two, one front and one rear. Modifying the circuit to use two front is the last major hurdle.. Right now the montero and diamante ecus are only reading the front bank o2 and we all know that is not ideal.. I should have it soon..

How will this affect those of us that only have two o2's?

[Jesters Deadd]

How will this affect those of us that only have two o2's?

Coop, I tested this. You can run it by just deselecting some of the peripheries in the code. Since I have two Lc1 wb o2s I can manipulate each of the 4 channels coming into the ECU. Well long story short the daimante ECu reads the front and rear upper (precat) o2 signals correctly. I couldn't really test the postcat o2 signals because I don't know the MUTIII readout for them. But it also depends how you set up the O2s. If you go front and then back bank it works fine. If you go pre cat and post cat there is a periph that changes the two banks to osilate on the same O2. but testing needs to confirm this still.

[Jesters Deadd]

Knock circuit layout

1998 3000GT SL 
MMC P/N MD347251
MFG P/N E2T61389 H3
PCB P/N JE331B157D

Con1-Pin 91 > R314 (TOP) > C45 (BOTTOM) > R315 (TOP) > IC2-Pin 78 < IC2-Pin 80 > IC1-Pin 92

R314 = 51 KOhm
C45 = 0.02 uF
R315 = 6.2 KOhm
IC2 = Mitsu Electronics E328 logic level converter
IC1 = Renesas H8/539F microcontroller, A/D input 6

1999 3000GT VR4
MMC P/N MD360163
MFG P/N E2T61495 H1
PCB P/N JE331B32804B

Con1-Pin91 > R71 (TOP) > C62 (BOTTOM) > R73 (TOP) > IC7-Pin 78 < IC7-Pin80 > IC9-Pin 92

R71 = 51 KOhm
C62 = 0.02 uF
R73 = 6.2 KOhm
IC7 = Mitsu Electronics E328 logic level converter
IC9 = Renesas H8/539F microcontroller, A/D input 6

Green, where did you get that info?