On/Off outputs

[joecam06]

I am just installing a MS V3.57 that was built by DIY AutoTune. I want to switch two shift lights and a water temp light. I just want to confirm that I can use any of the spare pins, 3, 4, 5 or 6 to do this.

When configuring these switches, how do the output port names sync with the pin numbers?

Sorry for the newbie questions.

[Matt Cramer]

Usually pins 3 and 4 are set up for CAN, if it says "CAN enabled" on the sticker underneath. (We've built them this way for the past year or so.) There will not be outputs on pins 5 or 6 unless it was special ordered with extra I/O.

[joecam06]

OK, thanks. I does say "CAN enabled" so I will use pins 3 & 4. I'm not going to be using the idle valve output on pin 30. Can I configure pin 30 to switch a light?

[Matt Cramer]

Pin 3 and 4 would be for the CAN bus and cannot be used as direct control outputs; they'd need to be hooked to a CAN enabled device instead.

Pin 30 is FIDLE and can be used as a spare output.

[joecam06]

OK, that's one I can use. I'm switching the fuel pump externally so pin #37 is available. Can pin #37 be configured to switch a light? What about using the spare digital outputs on pins 25, 27, 29 and 31?

[Matt Cramer]

If you're not using the stepper IAC, you can use those outputs to drive a relay too - note that pins 25/27 and 29/31 are paired, so you've got two outputs instead of four.

[joecam06]

Thanks, I get it now. I have the choice of using spare digital output pins 25 & 29 and unused pins 30 & 37.

[Matt Cramer]

Thanks, I get it now. I have the choice of using spare digital output pins 25 & 29 and unused pins 30 & 37.

Pin 37 is a dedicated fuel pump output and cannot be reconfigured short of rewriting the code.

[joecam06]

Thanks again. I learn something new every day.

[joecam06]

I have my wiring finished and laptop talking to the MS with TunerStudio but haven't started the engine yet. I have configured the FIDLE on pin 30 to switch a temp warning light and pins 25 and 29 to switch a two stage shift light. The problem is when I power up the electrical system and MS, without the engine running, all three lights come on and stay on. I've tried changing up the thresholds and power on values to see if they go off without success.

Any suggestions?

[Matt Cramer]

Be sure to use a power on value of 0 and trigger value of 1.

[joecam06]

Power on value is set to 0 and trigger value is set to 1.

[joecam06]

I figured it out. I had the < and > reversed. Thanks for your help.