Hi Guys I'm hoping someone can help me make some progress with my gbs wiring, I'm a bit stuck on the engine plug which spurs off from the chassis harness to my MX5 ME221 ECU.
It's mainly the top 3 pins I need to figure out where they go, the others should be ok.
1. Which pin do I use for main 12v ignition to the ECU? (On the OEM diagram it comes from the main relay to most of the sensors except coils and to ECU Pin 4B), I'm a little confused because Pin 2 sounds like the one but I'm measuring no voltage here. I've put a link to the schematic of the relay.
2. Pin 3 main relay control (coil, injection, lambda) I'm planning on connecting the ignition coils here but the notes state "emerald switches to earth" but I'm using an ME221 will this also switch to earth? I don't want to blow anything inside the ECU.
If there are any mazda builders that can confirm which pins they used for what that would be a great help.
https://imgur.com/eRrk20Z
https://imgur.com/se8BFkq
Not sure why it won't let me add a photo from imgur I'm sure I used this method last time.