Datalogger straight to ECU?

[IncorpoRatedX]

Hey guys, finally swapped a beefier trans into my 4g63 rwd turbo wagon, so it's time to tune a little and put a little extra boost on it. I'm running a stock dsm wiring harness and ecu with all the extras removed, this means there's no diag port... sooo....

Anyone know which wires I should hook into directly at the ecu? I have a couple of "diag port" wires labeled and capped off in the harness, but I have no idea which pins to hook directly too.

I have a small laptop I'd like to use instead of a palm, can anyone point me to a decent logger cable for a laptop (would have to be USB) otherwise I'll stick to the old palm method.

Thanks!

 

[MX4]

I did this back in the day. I used the www.vfaq.com pinout diagram to find the two wires to tap into. I wired them one way and it didnt work, so switched the wires over and it worked perfectly.

 

[IncorpoRatedX]

So you just used:

Pin 1 Self-Diagnosis Output
Pin 2 Diagnosis/Data transfer select terminal

?

 

[MX4]

Yes that's correct. And the third wire from the data logger goes to ground.

 

[IncorpoRatedX]

Hmm, the logger wires on my palm logger cable have two wires that appear to be hooked to each other, then a separate wire. so really it's only 2 wires but the second wire seems to matter how it's hooked up.

Any knowledge of which pin at the ECU is DATA-P1 and which is DIAG-P10?

My guess is:
ECU Pin 1 Self-Diagnosis Output = DIAG-P10
ECU Pin 2 Diagnosis/Data transfer select terminal = DATA-P1

In summary;
The first wire that has a single connector would go to DATA-P1
The second wire with two connectors would hook to DIAG-P10 and chassis ground

 

[MX4]

Yes that's correct. First time round I wired mine in backwards and then rewired it after it not working. Didn't do any damage.

 

[IncorpoRatedX]

Thanks!