Hi pete,

Have you made any more progress with this?
I'm at the stage where i'm jumpering my megasquirt to the adapter board and this has been vey helpfull so far.

 

Nope, I'm currently at a slight dead end. Although I had a brainwave last night, on my car the tacho is driven by the ECU, so one of the lines out of the ECU must be the tacho drive. I'll hazard a guess that the blue/white wire in 2E is the tach connection, as I'd guess that the tacho has a high impedance input.

My Megasquirt II kit has arrived, however I'm still waiting on my four channel injector board and probably a JimStim to arrive before I can get it up and running, so once I get the car fired up I'll confirm everything once again.

 

Just been in contact with a guy over on miataturbo.net with a '96 euro and he sent me this

I had my ECU built by Braineack to these pinouts. Found this on M.net (credit to BaktusBor, IIRC). Check your harness that the wiring actually exists! I had to add 2T to gain control of the fuel pump relay, as there was no such wire in the harness.

There's definatley a few discrepencies though.
I think tach is the CKS.
I'm sure we can get to the bottom of this.

 

Yeah, I have that as well. Some of it is right, however a good amount is definitely wrong, at least with my car and ECU. That's what prompted me to actually buzz the car out, as I couldn't find an accurate source of information online.

I reckon that still to be confirmed on my car is a line from the rear window circuit, the tacho outputand the fuel pump.

I am told that the fuel pump is also partly controlled by the immobiliser, which is why I've not been able to trigger the pump by grounding out pins in the ECU connector.

 

I think im almost there with the megasquirt adapter board.

Just re read your earlier post.
I didn't know the rev counter was ecu driven. You probably are right though, i think on a tach line you should see 12v on a multimeter with the engine running, obviously the multimeter isn't fast enough to register the oscilation.

The only thing i'm missing apart from that and the fuel pump is IAT. On diyautotune it shows when removing the maf to wire it up to pins 3 and 4 on maf plug, but there picture shows it 5 pins and mine has 7. Tried puting a mulitmeter across the pins on the maf itself to find some resistance for the sensor, i couldn't find anything.

Also what type of immobilizer is fitted as standard? Mines a laserline, where you have to touch a key thingy in a socket is yours the same?

 

On the later UK spec cars the tacho is driven from the ECU rather than the ignitor. I didn't make any measurements with the car running, all I know is that pin 2E reads a very high resistance to ground, having said that it may simply be a dead end in the loom somewhere.

None of the measurements are taken with the engine running. I've seen reference to splicing into a green wire in the driver's footwell to control the fuel pump.

The IAT can be connected to pins 2 and 7 in the AFM plug. AFM pin 7 connects to pin 2P on the ECU plugs, pin 2 is simply a ground

 

Thanks for that.
Just checked 2E for voltage with the engine running, nothing there. I disconnected 2e from the plug started the engine and the tacho is still working perfectly.

 

OK, sounds like it's a dead end in the loom somewhere then. I know that on either USDM or JDM cars 2E carries either the CKP or CMP signal so it's possible that the wire is in place but not used.

Thinking about it, the tach drive is probably one of the wires labelled as "Data link", as the tach signal is brought out at the diagnostic connector, and all the Data Link pins connect to the diagnostic port.

Hopefully that leaves 1T and 1S as brake and clutch switches, it'd be very handy if there was a clutch switch already wired in so I can get launch control running

 

Halle-motherfungling-lujah, This pinout is 99.9% spot on for my 92 eunos, been looking all over for this. Cheers!

... ROFL just seen how old this thread is: epic.

Just been in contact with a guy over on miataturbo.net with a '96 euro and he sent me this

I had my ECU built by Braineack to these pinouts. Found this on M.net (credit to BaktusBor, IIRC). Check your harness that the wiring actually exists! I had to add 2T to gain control of the fuel pump relay, as there was no such wire in the harness.

There's definatley a few discrepencies though.
I think tach is the CKS.
I'm sure we can get to the bottom of this.

 

Looks like it may very well be the CKS, which then might also serve as a tach signal. Since it's functionally the same. This would also explain the WHT-BLU wire showing up in the diag plug.