Alhamdulillah today I have good news. My car Pajero Mini is finally completely running with all sensors and ECU in perfect condition.
Here's how I got it fixed.
The last thing I needed was a healthy ECU or a damaged one so I can take one IC (M5269L) from it. I didn't find good deal for replacement ECU, and couldn't find a damaged one.
The last option was to create a clone IC of original M5269L motor driver. This is exactly what we did [emoji5].
As I posted earlier, my elder brother is expert in embedded electronics. He checked how this driver IC works, and designed this master piece. Shown in above diagram.
This is perfect clone of M5269L, and it can handle upto 20Amps current, original one can handle max 2Amps. The photo also shows SMD parts we used to make it compact enough to just replace in same IC's place.
Here are photos as M5269L IC clone is made in different stages:
First IC complete, ready to test.
Testing phase 1
Testing phase 2, SUCCESS!!! - it was 3:30am in the morning.
Working, exactly as original IC, but now it can handle more current.
M5269L vs DIY replica of it.
Checking if it fits properly in limited space.
Both ICs now ready and tested.
Following photos are after soldering new DIY ICs on ECU board:
The ISC motor is controlled by 2 M5269L driver ICs. There are 6 ICs as you can see in photos, ICs labeled IC104 and IC105 are the ones which control ISC.
We replaced both so both coils of motor get same current rating.
Pajero Mini 1995 M/T