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Old 04-12-2015, 08:17 PM   #1
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Default 94 MS3X Seq fuel/spark wiring verification

I'm such a ! Flamesuit on!

I've had a MS2xPNP before but wiring up a ms3x for full seq was a new experience.

I've compiled all of my research and thought processes into a modified version of a longstanding diagram for 94-95 installs. This setup is a bit different as it will be using the the 12-1 OPTICAL wheel for the 90-93 CAS to create the CKP and CMP signal for sequential spark and fuel.

If someone would be kind enough to look over my work and let me know if I'm missing anything (or have gotten it wrong) regarding wiring up the MS3 main and MS3x harness to the DIYBOB.

Would I be correct in using a 5A fuse from the fuel pump relay for the injectors and use INJ A,B,C,D as the ground switch? That's what the MegaManaul portrays, at least for a batch fire setup. I'm just assuming I'll be replacing the two batch signals with the individual driver signals from the Xpander card?

Same for the Toyota COPs? Use the existing +12, GND, retain IGF signal (factory blk/wht for dashboard tach), and use spark A,B,C,D as the triggers instead of the brown and brown/yellow wires at 1G and 1H?

I'm hoping I haven't botched up the terminology too much. This install isn't for me and I'd rather have it go as seamlessly as possible.

Please and thanks in advance!

EDIT: I meant 1G and 1H in the image, NOT 1M for ignitor!
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94 MS3X Seq fuel/spark wiring verification-90579d1380869914-guide-ems-4-miata-standalone-9495_standalone_harness.jpg  

Last edited by Grantofhell; 04-12-2015 at 08:37 PM.
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