okay yes I will check that right now. yes the ecm doesnt transfer it to rcm mode because the ohms on the j2-23 is not what the ecm needs. in distributor mode I should have over 3000 ohms at j2-23 but i have 1000. if i disconnect the ecu and give 5v to j2-24 , i have 5000 ohms on j2-23. just the opposite way what it should be like.

okay i hookes it up to a battery, didnt change something. on tps and map i have 4.99V from the ecu coming.

on j2-23 i have 5000 ohms and 1000 ohms when i trigger j2-24, but only with ignition off. referring to the manual i should test that with ignition ON, but then I have 1000 ohms on j2-23 and 5000 when i trigger j2-24. so with ignition on it doesnt do what it should do.

how do you have the ignition switch wired into the cannon plug ?
https://cimg3.ibsrv.net/gimg/www.off...f6d0e9afd8.jpg

https://cimg8.ibsrv.net/gimg/www.off...4f0a7d8b4e.jpg
the right hand cable is connected to the battery negative, together with the big ground cable off the engine block. the lefthand cable is connected to the battery + together with the big cable from starter motor.

4.99 is good enough
Circuit 423 should key ON = no more then 0.5V motor running = 1.2V
Circuit 424 should key ON = no more then 0.5V motor running = 4.5V

Did you get the module from GM or Merc?

key on 423 is 0.04v
key on 423 is 0.00v
on j2 connector without ecm hooked upstarting the engine isnt possible right now because i have disassembled the intake manofold to check the harness.

i have 2 modules, thought maybe the 1st was bad. both are merc

are you sure that gnd wire in the plug is in the correct pin ?

https://cimg1.ibsrv.net/gimg/www.off...5ae40259c4.jpg
refereing to this it should be right

did try everything. don't know what to do now with this. anyone?