4WD Light is ON but but diff doesn't work so no 4WD! HELP HELP HELP

[achha64]

Well, I think we are down to a faulty 4wd ECU or a connection issue between the ECU and the VSV's. We can rule out the transfer case switches, power issues, and 2-4 button issues because the T-case is being engaged and disengaged as it should. So I need you to access the 4wd ECU in the left kick panel and use your test light to check for voltage on Terminal 11 (solid light-green wire) and Terminal 4 (purple wire with green stripe) and do this in both 2wd and 4wd.

I also would like you to confirm whether ADD engages in L4 by any chance. I doubt it, but it is something we need to check.

Or this is the 4WD ECU?

 

[TheDurk]

Or this is the 4WD ECU?

That's it.

 

[4eigner]

That's it.

Isn't that the elocker ecu?

 

[achha64]

That's it.

I need to check the cable that come in the White plug on the ECU right? I'm a bit slow now! just got back to work and the truck is at the polish shop!

 

[achha64]

That's it.

Can you please pointing me where is the 4WD ECU? I cannot find it!
If you have an image that you can point it in!

thank you