Male 22pin Connector (Cressida) or Toyota pin compatible 20+pin M&F connectors

[takai]

+B is switched by M-REL, but the COR for an MX83 is in the engine bay, so tapping the engine bay post COR +B wire is just as good.

The JZA80 doesnt have any body plug ECU connector either, it is all routed through two other plugs II1 and IJ1, neither of which have the +Batt terminal. They do have +B and +B1 though, which are hooked up in cabin, but there is another +B terminal in the engine bay for coil, ignitor, and the like.

Its all a sweet pain in the arse.

Here is the full electrical wiring manual for USDM JZA80s
http://gallery2.plebeians.net/v/cars...rical.pdf.html
It feels like ive been through it a million times.

[wilbo666]

+B is switched by M-REL, but the COR for an MX83 is in the engine bay, so tapping the engine bay post COR +B wire is just as good.

Why not pick up off the 7mge ECU +B and trigger the Master Relay via the ECU M-REL pin. i.e. use as many of the factory existing wires as possible...

I don't see any reason you can tap in +B inside the cabin off the existing 7mge ECU wires!

The JZA80 doesnt have any body plug ECU connector either, it is all routed through two other plugs II1 and IJ1, neither of which have the +Batt terminal. They do have +B and +B1 though, which are hooked up in cabin, but there is another +B terminal in the engine bay for coil, ignitor, and the like.

Its all a sweet pain in the arse.

I would have thought that if you connect +B inside the cabin the engine bay +B would also be connected, have you checked the loom for to see if that is the case?

I thought 2JZ-GE was the same as 2JZ-GTE in that the 40pin ECU plug was part of the body loom... but I haven't ever seen a complete 2JZ-GE with body loom!


By the way does the 2JZ-GE run a fuel pump ECU like the 2JZ-GTE? If so the FPC output from the ECU will be a PWM output and you will want an RC and FET circuit to drive the MX83 COR (Or a tachometric relay)...

Also you have to pull the DI pin on the ECU to voltage to get a PWM output on the FPC pin...otherwise the ECU thinks there is an issue with the Fuel Pump ECU

ps, not sure if I'm any help at all!

Cheers
Wilbo

[takai]

You can take the +B power from in cabin, but its nowhere near what the engine needs. The wiring in cabin on both the ECU and Body side is around 7.5A wire, wheras the engine bay +B plug is 30A. The 7M loom has a +IGN line from the NSW in cabin which it uses for most of the high amperage stuff, but to use that i would have to transfer it to outside the cabin. Why do that when i have a nice accessible +B post COR wire in the engine bay already.

Thanks for the info on the FPC pin, ill make sure that i pull DI to +12v. I will probably end up using an AE92 tachometric relay to drive the fuel pump, same as it is done on the AE92. The MX83 uses the AFM to open the fuel pump relay.

[wilbo666]

Why do that when i have a nice accessible +B post COR wire in the engine bay already.

OK, I can see where you are coming from

The only problem I can see happening with that is that the FPC pin and hence you COR will shut off as soon as you stop the engine (IGN -> OFF). This will mean power to the ISCV (And the ECU...) will also be shut off, and the ECU won't be able to close/reset the ISCV to a know state...this might make your ISCV function a bit special...

Was the 7mge coil power part of the body or ECU loom out of interest?

Cheers
Wilbo

[takai]

Coil power comes from the body loom, and goes to the ECU loom. Not through the above 22pin connector though, its part of another one. The MX83/7M has 4 plugs which go to the body loom.

The way im wiring it up, the ECU will still have a permanent BATT wire, and will still be able to open the COR through the M-REL wire (its the only one im pulling from the engine bay back to the body loom). So everything should function as standard. Should.