DIYPNP B55 stepper mod

[ZOOMZOOMs]

Good night, i´m building a DIYPNP bosch 55 pin , for a peugeot 306, it uses an stepper motor iac , i have checked the documentation, but still in doubt about the pin connections in the UND2916 , document says to conect IAC-ENBL TO PB4, but there´s 4 pins marked as IAC_ENABLE the question is; all 4 pins must be connected to pb4?

thanks for your help!

Juan

[Matt Cramer]

Correct, you need to connect all four.

[ZOOMZOOMs]

thanks a lot Matt!

[ZOOMZOOMs]

after a lot of guess work i been able to wire the ecu... but the stepper, is not working, i tested as suggested in the diyautotune place, (tps vs outputs) and found a funny behavior, when comanded a port , it gives the expected 12v , but when is at "rest " it shows 5v...
for sure i miswire the und2916, but i can´t see where the problem is...
any suggestions of where to look?

[Matt Cramer]

Where are you measuring 5V?

[ZOOMZOOMs]

i´m seeing 12 volts between 1b and 2b when activated, at the same time (when active b ,there´s 5v between 1a and 2a ) if i activate the a (1a 2a) i can see 12 volts in the "a" outputs, and 5 volts at the "b" outputs.
is this correct?

Juan

[Matt Cramer]

You will only want to check the voltage between 1A and 1B, and 2A and 2B.