Voltage on pin #24? (Tach input)
#1
Elite Member
![](/mt2011/images_td/ranks/supporter1.gif)
Thread Starter
iTrader: (10)
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,987
Total Cats: 359
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Hi guys,
can someone with a functioning MS1/MSnSe measure the voltage across pin #24 and a ground, and tell me if they get 5V? I am feeding my MS with the CAS signals (CKP on #24, CMP on #25, standard DSM-like mod from diyautotune) however I'm not getting any response in Megatune, the RPM gauge reads 0rpm all the time.
Now, my board builder says that it should be 5v, is this true?
Thanks,
Jim
can someone with a functioning MS1/MSnSe measure the voltage across pin #24 and a ground, and tell me if they get 5V? I am feeding my MS with the CAS signals (CKP on #24, CMP on #25, standard DSM-like mod from diyautotune) however I'm not getting any response in Megatune, the RPM gauge reads 0rpm all the time.
Now, my board builder says that it should be 5v, is this true?
Thanks,
Jim
#5
Elite Member
![](/mt2011/images_td/ranks/supporter1.gif)
Thread Starter
iTrader: (10)
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,987
Total Cats: 359
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Originally Posted by kingofl337
With the CAS unplugged pin 24 should be high at 5v and 25 should be high at 12v.
Jim
#7
Elite Member
![](/mt2011/images_td/ranks/supporter1.gif)
Thread Starter
iTrader: (10)
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,987
Total Cats: 359
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Originally Posted by kingofl337
Hook the CAS upto a drill.
Good idea - I have a Dremel that has a variable speed trimmer, so if I can find a suitable way to attach it to the nose of the CAS, it should do the trick.
Btw, I have tested the CAS itself by connect it up to my oscilloscope, I get the expecte pulses (ie as expected by the slotted disc) just fine.
#9
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Originally Posted by Reverant
Good idea - I have a Dremel that has a variable speed trimmer, so if I can find a suitable way to attach it to the nose of the CAS, it should do the trick.
Btw, I have tested the CAS itself by connect it up to my oscilloscope, I get the expecte pulses (ie as expected by the slotted disc) just fine.
Btw, I have tested the CAS itself by connect it up to my oscilloscope, I get the expecte pulses (ie as expected by the slotted disc) just fine.
goto Home Depot and get some rubber 3/8" rubber hose and use it as a coupling.
Thread
Thread Starter
Forum
Replies
Last Post
Zaphod
MEGAsquirt
47
10-26-2018 11:00 PM