Went to punch in a couple values to get boost control setup and PCLink won't let me assign Aux 12 to boost control. Aux 12 on my board is the Purge Valve Solenoid, which is removed on my car and has been rewired to control an EBC solenoid. I've been running this setup on my old ECU for over a year now with no issues.

From what I've read, any of the Aux outputs should be capable of controlling PWM. I've also made sure that the Purge valve is not assigned to the pin any longer. I can see Aux 12 in the Purge Valve input select menu.



I updated PCLink to the latest version as well. Thoughts? Prayers? Maybe I'll run this one by the guys on the Link Forum as well. It seems like Aux 12 can't do PWM, or that there's a bug in this menu.

 

Found the answer. Looks like Aux 12 is not available for PWM. This was not listed with the rest of the Auxiliary output limitations.

In the Link Help docs : "PWM Functions - PWM functions can be done by all Ignition, Injection, CAN Aux and Aux 1-14 on the G5 Voodoo Pro or Aux 1-10 on all other ECUs. All PWM outputs are Low Side."

 

That sucks, haven't run into that. Luckily, you can use Aux 4 from VICs if you have a square top, or use this excuse to buy the brand new square top in the classifieds currently. That, or you can use injector 5 or 6 from the rear o2 heater or egr solenoid, neither of which you're using, I'm guessing. Aux 5 and 7 are also on the EGR plug. And aux 8.

And aux 6.

 

Yes this is an unfortunate thing, which is why I did the pseudo PWM weirdness for the purge solenoid in my car. The easiest thing would be to use a different aux or injector out as curly said. A more involved solution would be to swap the purge pin at the ECU header to a PWMable pin, like the fuel pump, and then switch the fuel pump output at the ECU to Aux 12

 

Sorry guys didn't get any notifications about the replies. I ended rerouting some things and got it working. I put my wideband on the rear o2 and boost control on the front o2. My boost controller is bolted to the front of the valve cover, so it actually allowed me to use a pretty short pigtail and remove an extension harness I had been using. Pretty cool to have so much I/O piped into the board.

PS, if you're using test modes to check your wiring, make sure you're actually connected to the ECU and not just plugged in I was pretty confident my wiring was correct and couldn't figure out why the solenoid wasn't firing. Test modes are a new one for me, really handy to have for stuff like this.