I'm cross-posting this from CR.net since there seems to be more MS activity here...
I bought a DIYAutotune pre-assembled MS3X v3.57 w/ Main and MS3X harnesses as well as IAT and internal knock module back in the Spring. First-time MS user, chose to not assemble from components due to time. It's pretty much Winter, so I finally have some time to begin the wiring and installation...
`90 Miata chassis, original 1.6 B6 engine
I/H/E, will delete AFM to run MAP
Will run Sequential Fuel, stock coils for now
Innovate LC-1 wideband
DIY harness adaptor - 64-pin Male Connector, TE/AMP 174518-7
MS v3.57 Generic External harness, MS3X harness
Frank's Westfield MS3X pinout
I'm wanting to confirm I understand the ground wire situation w/ the MS3X...
: On my DB37 main harness, there are no pins in the DB37 connector body from 8
-- connecting Main 8
to chassis pin 2B
and Main 10
to chassis pin 2A
(per Frank's pinout) appears moot. So combine MS3X-2
onto pin 2A
onto pin 2B
w/ nothing else from the Main harness?
: Crank Input, Sensor Grounds. Crank Input = Main 24
, on chassis pin 2E
, WHT from WHT/BLK twisted pair; Crank Signal Ground = Main 1
, going to chassis pin 2C
, BLK from the WHT/BLK twisted pair. Frank's pinout then says another Sensor Ground, Main 2
, on 2D
; Main 2
= shield wire from WHT/BLK twisted pair...is this not grounded through the DB37 internally to the MS3?
: If that's the case, what goes on 2D
-- Main 7
, Sensor Return, BLK/WHT? Sensors will be grounded back at the MS3, not the chassis, so it seems reasonable this will ground any low-current signals back to the MS3 via 2D
I'm aware of the importance of these grounds, so I'd rather not mess these up and run into issues on first-start. Let me know if I'm overthinking this, as well. Thanks for any assistance.