Confirmation: DB37 pin/ harness wire orientation (spark issues) -MS1e/1997 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-01-2012, 08:10 PM   #1
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Default Confirmation: DB37 pin/ harness wire orientation (spark issues) -MS1e/1997

I'm wiring a MS1e to a 1997 Miata as a standalone unit. Input/output mods for stock ignition have been done already, and confirmed.

I followed the two known diagrams for wiring a DB37 to a 1997 1.8, as a standalone setup:
http://www.boostedmiata.com/gallery2...ne_harness.jpg
http://www.boostedmiata.com/MS/db37_MS_pinouts.jpg

MY CONFUSION/QUESTIONS/CONFIRMATION:
1. PIN26= 5VREF(3I) ?
2. PIN24= thick gray CAS(4F)... Does tach (b/w 4L) also go to PIN24 for an RPM signal from CKP?

*I'm trying to eliminate variables to track down why I'm not getting spark, or an RPM signal in Megatune. I assume no appropriate signals from the CAS to MS. (car runs perfectly with stock ECU wired)

*I do get the common MS "powered up spark jolt/firing" randomly, so I assume my ignitors are wired correctly and receiving signal?

Last edited by beansrown; 04-01-2012 at 11:59 PM.
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Old 04-02-2012, 11:03 AM   #2
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pin26 - 3I
pin24 - 4F
pin25 - 4G

4L is tachout, so it's whereever you build that circuit to output on your MS, use one of the 4 spare holes.
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Old 04-02-2012, 02:12 PM   #3
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Thanks for the reply, and information.
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