Ok friend I have done some more tests and here are my results.
1) Take out previously indicated SOIC8 3043539 IC and found that ground connections are in board. I compared it connection with another good ME7.5 board I have and it has same connections. Inclusive with IC out board, ECU doesn't startup either.
2) I take out Bosch power supply unit 30343 CJ911 and start to solder and test pin by pin and ECU doesn't startup again.
3) Then I test continuity test with ground of each pin and compared voltage signal of a working ME7.5 ECU I have with the ME7.1.1 I am trying to repair. Here are the results.
ME7.5
ME7.5 ME7.1.1
1 GND GND
2 GND GND
3 0,03 0
4 0 0
5 0 0
6 GND GND
7 5 0,02
8 5 0,02
9 5 0,02
10 5 0,02
11 5 0,02
12 22 11,5
13 5 0,04
14 0 0
15 GND GND
16 0 0,07
17 12,2 0
18 GND GND
19 GND GND
20 12,5 13,3
21 13,1 0
22 12,5 13,3
23 5 0,02
24 5 0,02
25 5 0
26 0 5
27 5 0,02
28 5 5
29 5 0,02
30 12,2 0
31 5 0,02
32 2,4 0,02
33 2,4 0,01
34 0 0,02
35 0 0,02
36 GND GND
I also left you datasheet of the Bosch CJ911 power supply unit. But what seems ood to me is that pin 12 KL15 Ignition is OFF, it should means that simply power supply unit is turned off?
