Fuel pump won't run in that configuration. Acutally how it's wired now, you might blow a fuse or damage the MS board.
The wire going to 1C is specifically used for the High Side Driver circuit to power the fuel pump, as labled, it's a
12volt wire. The wire you put to pin 37 is a
ground. power and ground don't mix.
That diagram is to be used in conjuntion with my how-to which already explains this, but:
Since the 90-93's fuel pump is activated by the AFM and the ECU has no direct link back to the fuel pump relay, we got creative in how to get the MS to run the fuel pump. You know how your fuel pump runs for about 2 seconds to prime on keep on? Well, 12v is getting sent for a few seconds from the battery to 1C to do this, so we've started using a custom circuit to send 12v to 1C instead of a normal ground to the relay. the ST-SIGN fuse must be removed when doing this, else the driver gets overheated by the constant path to the battery on it's output.
Otherwise, if you are removing the AFM, the simplest solution (especially with a v2.2 board without room to build the high side driver circuit) is to connect the db37 pin 37 to 2O, this can then be jumped to the F/P relay pin on the AFM connector using a short piece of wire. That way, the normal f/p ground will be sent to the AFM connector, through your little jumper wire, and ground the f/p relay like the AFM would. Make sense?
If the AFM is being left in place, dont connect the wire on pin 37.
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You have pins 25 and 27 crossed, as well as pins 29 and 31.
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only connect pin 22 and 26 if you plan to wire up a linear TPS.
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For the grounds: 2A-D, run 4 seperate wires to each if possible. Kinda too late now, don't worry about it. Just easier/cleaner.
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Make sure to Jump 1J and 1Q if you plan on activating your A/C.
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Have you built the MS yet? Do you know how to properly modify a v2.2 board for the miata, including adding the idle pwm circuit?
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Pretty clever little harness, but you should have checked this out first:
