Hi, I have just taken my ECU out ready to fit an ND stage 1 chip and was interested to know what ECU I have.
I have done a search and couldn't find the info for a type 84 ECU.
The other numbers are 23710 39F05, MEC-DO27 and 3109.
It is out of a 93 L S13 with a JDM engine.
Cheers
Si
what's a JDM engine ??
Heh, remeber times when i also said what the hell is JDM? And know i know it:
JDM = Japan Domestic Market
Last edited by 935Baby; 26-01-2005 at 18:11.
Same as a JSPEC ? that's wot i've got !
I also used to wonder when I used to read JDM ie on ebay listingd etc.
I should of said jap spec, not that I really know what the difference is, but I was just curiouse about the ECU. Not seen the number 84 anywhere on here.
Si
Anyone?
iirc the only difference is manual and auto ECU's. Theres some arguement over if theres a difference between some pre and facelift ecu's (lamda feedback).
You have a Lambda equipped Manual Trans ECU.
FAST says there are 6 types of ECU For UK/RHD
Part no. from MMYY to MMYY Spec
23710-39F05 0990 on AP-CA18DT.MT
23710-39F15 0990 on AP-CA18DT.AT
23710-44F00 0988 1089 CA18DT.MT
23710-44F01 0988 1089 CA18DT.MT
23710-44F02 1089 0990 CA18DT.MT and 0990 NAP.CA18DT.MT
23710-44F10 0988 0990 CA18DT.AT and 0990 NAP.CA18DT.AT
Looking at it
Lambda ECU 's are 39F
AFM Mixer screw ECU's are 44F
Manual ECU's have 0 as the last but one digit
Auto ECU's have 1 as the last but one digit
AP - Anti Polution (Lambda) from 9/90
NAP - No Anti Polution (AFM screw) upto 9/90
before 9/90 all ECU's are non lambda so NAP not shown.
MT - Manual
AT - Automatic
Non lambda (NAP) manual trans (MT) had 3 revisions.
23710-44F00 can be replaced with 23F710-44F01 but I don't know why they had both at the same time. Maybe different assembly plant or suppliers.
23710-44F01 and 23710-44F00 can be replaced with 23F710-44F02
Europe/LHD there are 8 codes
23710-39F00 0988-on AP.CA18DT.MT (except aircon HCF134A)
23710-39F01 0893 AP.CA18DT.MT Air Con HFC134A
23710-39F10 0888-on AP.CA18DT.AT (except aircon HCF134A)
23710-39F11 0893 AP.CA18DT.AT Air Con HFC134A
23710-44F05 0988-1089 NAP.CA18DT.MT
23710-44F06 0988-1089 NAP.CA18DT.MT
23710-44F07 1089 NAP.CA18DT.MT
23710-44F15 0988 NAP.CA18DT.AT
44F05 can be replaced by 44F06 and both can be replaced by 44F07
Last edited by skyshack; 09-06-2010 at 22:04. Reason: Found a DE!
good info.
Thanks for the info guys.
Now I know I am no different to anyone else.
Cheers
Si
Last edited by Crooked200SX; 26-01-2005 at 22:28.
Skyshack,thanks for that info,as i have a spare ecu and when fitted the idle drops to 7/800rpm otherwise car runs ok ,must check the numbers
Originally Posted by skyshack
I have probably German specification of CAT facelfit S13. On my ECU is big number 70 and bellow is code 23710 39F00. Is this CAT ECU????
Soooooo, are the pre and post, Lambda and non Lambda ECU's any different in terms of electronics?
YES but I'm not sure if all the changes are lambda/no lambda and/or some due to manual/auto. I've only had a pre face lift non lambda automatic and a post facelift manual with lambda ECU apart. Circuit boards have exactly the same model ID's on them.
The prefacelift dosen't have a transistor to switch the lambda heater circuit on, so lambda function will be poor if a non lambda ECU is used on a lambda car as it will cool off on overrun and won't go into closed loop until it reheats. A rom swap shows it does work when hot, just not going to be 100% right (future test is to fit a transistor and lambda rom to see if all it needs is the transistor and code). It has an IC60 fitted that looks like a mod chip (8 pin pic) which is not fitted on the post facelift. I think it's something to do with the idle mix but it could be something to do with the Auto control.
Both have a transistor connected to pin 5. This is the Japanese boost control circuit for low octane petrol. There is no wiring in the UK loom to pin 5. There is copper on the circuit board for pin 8 the Jap 8 port butterfly control but the transistor T365 is missing. There is copper between Pin 102 and a transistor T311 but I don't know what function this serves if fitted. There are a number of pins with copper traces on the ciruit board that appear to be missing parts, connected to pins 13, 21, 22, and 31 (my notes are crap for pin 55 amb temp I'm not sure if there are parts fitted or not)
I can't work out if I got the dump from the post lift rom wrong (maps look right and it hits the same locations in the RAM and REGISTER map I'll do it again sometime soon) but a code tracing dissassembly doesn't seem to access much of the contents while the pre face lift accesses almost the full rom content from 3 int vectors. Maybe it uses a calculated vector or fake return - push the addr it wants to jump to on the stack before doing a return. I know the bloke who wrote the rom code for the Nascom liked doing that sort of thing to defeat dissasembly of his code and detect theft as people coudn't work out what was going and had to copy it complete. (Had a few words to say about Tatung lifting his rom code for the Einstein but he still had a few around the Tech college electronics lab where he worked).
OMG
OMFG
This is where my car baffles me once again...
The MMYY for my sx is 0791, so that makes it a late 91. It came with facelift bumper but no light washers, air con or LSD and small brakes. Its also a non cat car and the downpipe doesn't have a bit for the Lambda...
I'll check the ECU code n see what part number its got.
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