na to vvti swap

[kmichael]

I have a 1993 us spec supra and a 1998 vvti motor. Cant seem to get 12v to the throttle valve motor. Any one got any clues?

[George]

Depending on how it's wired it may be electrical or mechanical issue. Most obvious idea is that you don't put 12v where it should be...ECU terminal "+BM". Also ECU's for engines with ETCS-I usually have additional ground terminal EC, which is also critical for et. operation.

btw, 1 or 2 jz? the latter may be immobilised.

[kmichael]

Thanks for getting back, the motor is a 2jxgte vvti 1998 with the newer etcs. I did find 2 ground points in the 1j2 plug that were not grounded and have since grounded them.
At this point still no power

[George]

You still have to check every pin that needs +12V. Especially +BM, there's no such in earlier models.

[wilbo666]

Geroge is right, you need to make sure that the engine ECU +BM pin is powered. I have a feeling that it might not be currently! It is fed from a seperate fuse (ETCS).

Below is for 2JZGTE VVTi from JZS161, but the +BM / ETCS circuit and engine ECU pin is the same as 2JZGTE VVTi from JZA80
wilbo666 / 2JZ-GTE VVTi JZS161 Aristo Engine Wiring



Cheers
Wilbo

[kmichael]

I have 12v to all the points on the ecu and found on the 1j2 plug pin 8 and 9 are grounds and not on the 1993 na harness. All are grounded now but still nothing no
power to valve motor.