Alternator output to ecu

[dangerrous]

Hi Guys, just doing a V8 swap and need to sort out the instrument cluster, Paul has advised me to keep the communication between the old ecu and the instrument cluster, but due to everything now being Audi I just need to know what the original Toyota alternator outputs as a charging signal to the ecu so i don't blow anything. is it +5volts logic level or +12volts, I'm hoping it's a standard +12volt then switching off once the alternator makes voltage. My Audi alternator is a standard affair +12volts switching off once charging has commenced.
Cheers
Darren

[Mr2karl_tbar]

V8 swap?? Where have you been hiding??? I demand pics!!!

(Sorry I couldn't be more help)

[dangerrous]

it's on youtube under dna Ferrari replica mr2 mk3
D

[cdwood2010]

Welcome Darren. That sounds just awesome.

Here's the vid folks:-

[Mr2karl_tbar]

Dude seriously nice one!!!!

[dangerrous]

Although not part of the topic, I'm not happy with the exhaust note, so I've commisioned another bespoker muffler, it will arrive next Wednesday. I'm trying to achieve a sharper more 'Ferrari' type of sound.
Didin't think this was the sort of thing the MR2 owners club would be interested in. but if you are I'll do an official post in the V8 section
D

[cdwood2010]

Do it. We love this stuff.

You must be mixing us up with some of them stuffy types.

Back on topic though - if you find a WSM for the Mk3 there should be sufficient information for you to trace what voltage runs into the ECU based on the pinouts and flow diagrams.

Not quite the absolute answer you need but its should be 'findable'. Annoyingly i have every WSM nearly apart from the Mk3!

c.

[dangerrous]

The workshop manual only shows the wiring into the ecu, guess I'll opt for logic level first then +12v. I only need to get the Dash ecu to change over to operation mode, I'm modifying the instruments to mimic the f430 instrument cluster.
I'll start a build diary soon, although it's all available on the DNA Owners Club.
D

[Nod]

The alternator runs the same 3 wires, only the warning wire goes through the ecu for the dash can bus. it is grounded I believe when the charging light it on (12v). Alt Sensing and 12v IGN feed are 12v too.

Lyndon.

[geoffmunt]

I urge anyone who hasn't checked out the build thread yet to do so - only up to page 15 so far but what a mind-blowing read!

Keep up the good work and hope to see the finished article soon!

http://www.dnaoc.co.uk/index.php/topic,415.0.html