ECU Extension Harness (1st Gen Echo/Vitz)

[ITA]

Hello all. I recently posted in the Forced Induction section about a MAF extension harness. Part of turbo-ing my Echo, I intend to use an AEM FIC. As stated in my MAF post, I would rather not splice into the stock harnesses/wiring. As such, I initially looked at plug and play done by third party. They were too expensive for my project, so I looked into getting a straight patch harness.

After some research, I discovered that the ECU from the SW20 MR2 had similar ports as the Echo. See here for the SW20 MR2 ECU pinout. See here for Echo ECU pinout. As you can see the SW20 MR2 ECU and Echo ECU share ports E7, E6, and E4, as identified on the Echo pinout.

I was able to find an untapped BERK straight patch harness for the SW20 MR2 from a forum member on mr2.com. I installed the patch harness yesterday to test before I start splicing the FIC harness in. The ports plugged in and the car started right up. It works! I will drive around with both the MAF extension and BERK patch harnesses installed to insure everything is operating OK.

Aside from Berk, I found another option. Field One Touch Harness CN-3 should work as well. From the RHDJapan website, this harness works for SW20 MR2's and NCP13 Vitz (pre-02) (this prompted my investigation into the matter). Good exchange rates right now make it a viable option, plus you get points for JDM-ness...

Please note that although the MR2 does not have a fourth port for E5, my Echo did not have a plug for E5 anyway. Maybe its for automatic transmission control? I am not sure what would go there, but my Echo is bare bones manual, aside from having AC and power steering.

Anyway, hope this information is helpful for anyone looking to wire-in a piggyback on their 1st Echo/Vitz.