I'm just looking for some clarification about step 22 which is as follows:
22. Now you need to make a decision on the first 'optional' component: if you are going to use an IAC stepper motor with MegaSquirt-II, you must install a jumper from the hole marked S12C to the hole marked JS9 (+12C). These are on the bottom side of the board, on the DB9 side of the processor. DO NOT INSTALL THIS JUMPER FOR NON-MegaSquirt-II APPLICATIONS - IT WILL DESTROY THE PROCESSOR!!
If you are going to use a stepper style IAC (such as the GM IAC), you need to connect jumpers to bring the controller signals out to the DB37:
Connect (1A)JS0 (under the processor socket) to IAC1A (near the DB37 connector) - this brings out IAC1A on DB37 pin #25
Connect (1B)JS1 (under the processor socket) to IAC1B (near the DB37 connector) - this brings out IAC1B on DB37 pin #27
Connect (2A)JS2 (under the processor socket) to IAC2A (near the DB37 connector) - this brings out IAC2A on DB37 pin #29
Connect (2B)JS3 (under the processor socket) to IAC2B (near the DB37 connector) - this brings out IAC2B on DB37 pin #31
If you will be using an ignition output signal to control a coil or ignition module with MS-II, you will, likely be directed to jumper JS10 to:
IGBTIN, with IGBTOUT jumpered to IGN
(Check the documentation for your ignition set-up!).
If you will be using CAN communication between boards (MS-II and GPIO, for example), you should also jumper JS6 to SPR1/CANH and JS8 to SPR2/CANL
So for MS-II implementation, the following connector signal jumpers are suggested:
CPU Connector Description
JS0 IAC1A Stepper motor signal 1A
JS1 IAC1B Stepper motor signal 1B
JS2 IAC2A Stepper motor signal 2A
JS3 IAC2B Stepper motor signal 2B
JS10 IGN or
IGBTIN (w/ IGBTOUT->IGN) Ignition output
JS6 SPR1/CANH CAN High
JS8 SPR2/CANL CAN Low
(Note: If you are using a PWM style idle controller instead of a stepper IAC, see step #62.)
Ive tried searching for something specific to the Miata but have had some trouble with conflicting information, could you specify what I need to do?