P11 Infiniti G20

UNISA JECS · Post by **UNISA JECS** » Sun Jun 07, 2009 8:47 am

Hey Matt I been looking at the wiring diagrams are you sure that the 99 G20t OBDII ECU cannot be done because its basically the same wiring and pinout as the 94-95-96 G20 OBDII ECU.

Granted in 00-01-02 the G20 OBDII ECU pinout is tottally different and the pinout is way different.

Can I be any help by maybe taking the cover off my ECU and taking some pics of my 99 G20 OBDII ECU?

UNISA JECS · Post by **UNISA JECS** » Sun Jun 07, 2009 11:25 am

Heres is a side by side comparisonof the ECU pins between the P11 1999 G20 OBDII and the P10 1994 G20 OBDII ECU.

Dont mind the B13 OBDI, I haven't finished that yet.

BLUE = MATCH
GREEN = NO MATCH

Matt · Post by **Matt** » Sun Jun 07, 2009 4:59 pm

later model OBD-II models have two processors, and two sets of memory ROM chips on the ECU board

the OBD-II daughterboards that JWT and Technosquare brought out use a largish ROM chip which holds enough program for both processors

Our NVRAM currently holds 64KB and needs another 64KB to do the OBD-II ROM. I'm thinking of using FLASH or other cheaper memory do hold the OBD-II part since NVRAM does not come cheap and would jack up the cost of the boards significantly if making an OBD-II version

UNISA JECS · Post by **UNISA JECS** » Mon Jun 08, 2009 4:04 am

Hey Matt I took this little log the other day using my stock 99 P11 SR20DE AT ECU.

Im able to monitor TP using and other items using the B14 (SR20DE)1996+ address file.

I also downloaded and attach a log and also did a consult download of my 99 P11 ECU .BIN.

UNISA JECS · Post by **UNISA JECS** » Mon Jun 08, 2009 4:13 am

Here is the part number for my ECU in my 99 P11 SR20DE G20t AT

A18-J77 CB2
99 G20
AUTOMATIC TRANSMISSION
OBD2
P11-SR20DE
23710-7J110

This info is also on JWT ECU I.D. list here

http://www.jimwolftechnology.com/wolfpdf/ECU-ID.PDF

UNISA JECS · Post by **UNISA JECS** » Mon Jun 08, 2009 3:24 pm

.............added updated pinout below

UNISA JECS · Post by **UNISA JECS** » Fri Jun 12, 2009 3:08 am

Heres is a final pin comparison between 1994-1996-1999 OBII ECU's

UNISA JECS · Post by **UNISA JECS** » Fri Jun 12, 2009 1:47 pm

99 G20t A/T ECU on left A18-J77 CB2

96 G20 M/T ECU on right A18-F15 C54

Matt would you be able to do anything with either of these ECU's so I can send one out to you

I really wanna tune my car using Nistune like I have with my S13 240SX that is now no longer parted it out after a bad accident

.

Matt · Post by **Matt** » Fri Jun 12, 2009 4:37 pm

A18-F15 C54 96 G20 N M U OBD2 P10-SR20DE 23710-0J600

that one looks like we can do it

I had an email with part # 23710-0J610 which is the A/T model and they sent me a photo yesterday its the same as my 95 P10 ECU as far as hardware goes (no extra rom and processor chip)

the second one I would need a photo but if its anything like the 1996 KA24DE OBD-II or 1996 B14 SR20DE OBD-II or 1996 Maxima VG30DE OBD-II ECUs which I have here on my pile of work to do then its going to be a while before I get around to it

my main focus at the moment is software updates and fixes with the current lineup

UNISA JECS · Post by **UNISA JECS** » Sat Jun 20, 2009 6:12 am

Ok Matt I went and picked up a couple more P10 ECU's because I dont know whats better for me to do since I am still automatic I grabed an auto ECU although I do have plans to going 5 speed soon. My question is if I send you a auto p10 ECU and later I go 5 speed will I be able to switch off the flag switches for Automatic ECU so I dont threw a CEL/MIL light?

Here are the other 2 ECU's I picked one of which had a question mark on the JWT ECU ID PDF because I guess he didn;t have the manufacturer part number, well I have that number and I know I pulled the ECU from a 95 P10 G20t A/T.

Wish I still had my consult cable then I could pull the actual ECU part number.

Anyhow here are some pictures:

ECU on the LEFT Manufacturer Pt# A18-B69 C12 Nissan Pt# 23710-0J200 94 P10 G20 M/T

ECU on the RIGHT Manufactier Pt# A18-E06 C47 Nissan Pt# 23710-0J212 or 0J213 either way these supercede eachother per Nissan FAST 94/95 P10 G20t A/T

UNISA JECS · Post by **UNISA JECS** » Thu Oct 01, 2009 9:23 am

Hey Matt about to make my P11 G20t 5 speed and im looking to buy this ECU:

JA18-H69 BP2
97 200SX N M F
OBD2
B14-SR20DE
23710-1M871

Can you work with this ECU before I purchase it?

Matt · Post by **Matt** » Thu Oct 01, 2009 10:21 am

1M871 is fine, we can do that and put a manual ROM image into the board.

UNISA JECS · Post by **UNISA JECS** » Thu Oct 01, 2009 10:27 am

Matt wrote:1M871 is fine, we can do that and put a manual ROM image into the board.

Ok cool, but FYI the 1M871 is already manual trans ECU.

Matt · Post by **Matt** » Fri Oct 02, 2009 1:00 am

i thought xxx7x was auto and xxx6x was manual?

UNISA JECS · Post by **UNISA JECS** » Fri Oct 02, 2009 8:56 am

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P11 Infiniti G20

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