# ECU Identification

**URL:** <https://forums.speedlife.net/t/ecu-identification/103629>\
**Category:** SON240sx Automotive\
**Created:** [February 7, 2007, 3:23pm UTC](https://forums.speedlife.net/t/ecu-identification/103629 "2007-02-07T15:23:29Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![just\_ersser](https://avatars.discourse-cdn.com/v4/letter/j/ccd318/32.png) [@just\_ersser](https://forums.speedlife.net/u/just_ersser)\
**Post date:** [February 7, 2007, 3:23pm UTC](https://forums.speedlife.net/t/ecu-identification/103629/1 "2007-02-07T15:23:29Z")

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hey guys i have been searching high and low on the internet and i can’t seem to find the application to this ecu. I have looked at the jim wolf web site and i cant see it on there , so im asking for some help

The ECU Sticker says “3R” in big letters and below that it has the part # A18-K21-GB7 and then 8121 but not sure if that means anything, i have read it might be from a 97-98 m/t 240sx but not sure…

any help would be appreciated  
thanks

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**Author:** ![spd-dmn](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/spd-dmn/32/5513_2.png) [@spd-dmn](https://forums.speedlife.net/u/spd-dmn)\
**Post date:** [February 7, 2007, 6:09pm UTC](https://forums.speedlife.net/t/ecu-identification/103629/2 "2007-02-07T18:09:14Z")

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What is the 10-digit Nissan part number?

it will be like #####-#####

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**Author:** ![Lith](https://avatars.discourse-cdn.com/v4/letter/l/fbc32d/32.png) [@Lith](https://forums.speedlife.net/u/Lith)\
**Post date:** [February 7, 2007, 7:47pm UTC](https://forums.speedlife.net/t/ecu-identification/103629/3 "2007-02-07T19:47:29Z")

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[http://jimwolftechnology.com/wolfpdf/ECU-ID.PDF](http://jimwolftechnology.com/wolfpdf/ECU-ID.PDF)  
Look through that and find a similar ECU and you might get a clue from what car it could be from.

Also, I found all the Nissan part numbers for the S13 and S14 (240sx) ecu’s. Try to find the proper Nissan part number on it, and then you could try to match it on the list.

S14:  
 ![http://i20.photobucket.com/albums/b206/Lith808/Nissan_S14_ECU.jpg](http://i20.photobucket.com/albums/b206/Lith808/Nissan_S14_ECU.jpg)

S13:  
 ![http://i20.photobucket.com/albums/b206/Lith808/Nissan_S13_ECU.jpg](http://i20.photobucket.com/albums/b206/Lith808/Nissan_S13_ECU.jpg)

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<div class="post-metadata">

**Author:** ![just\_ersser](https://avatars.discourse-cdn.com/v4/letter/j/ccd318/32.png) [@just\_ersser](https://forums.speedlife.net/u/just_ersser)\
**Post date:** [February 7, 2007, 8:15pm UTC](https://forums.speedlife.net/t/ecu-identification/103629/4 "2007-02-07T20:15:42Z")

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The numbers i gave where placed on a sticker top of the ECM, thats all it says but also there is a stcker on the same side as the self diagnosis mode switch, it has the numbers  
03002281-WA18K21GB7WWW  
thats it.

thanks for the help so far…