Burned MOSFET on ECU?

borohot

Hi! So I have touched what I shouldn't with IDLE (pin A8) wire when testing -> it sparked a bit -> pin does not react anymore on manual IDC control. Of course I had slider offset on 100%..
Which component is likely burned? Best way to fix? Thanks a lot!

JHM

It could be either Q1 or a track underneath the connector.
Check the connection between the Q1 cooling pad and pin A8.

borohot

JHM Did that, trace is alive, MOSFET measures ok (around 0.5V drain to source, everything else 0V).
Although, when I measured voltage on the connected ICV terminal (between +12V and IDLE pin) it measured 7.4V. Moving slider does not change voltage. Any ideas? Thanks!

JHM

Measure between the A8 and the ground, with the ICV connected. It should be:

12v at manual position 1%
0v at manual position 100%

borohot

JHM Yes that's what I wanted to say in the message before, sorry. I move slider and the voltage is always the same 7.4V.

JHM

then replace Q1 with something like IRFZ44

borohot

JHM I just did that and found the actual issue.
Is it normal that when you move the slider that it does not automatically updates value on ECU?
I had to flash each time when I've moved the slider, there was no live link connection.

JHM

You can enable it with "autosave" checkbox