Anyone got any suggestions on trying to figure out my lack of RPM signal from my Megastim 2.1? The following is copied from my help thread
Well, I've got a MS1V3 I am assembling and a Megastim V2.1. A 12VDC power supply is powering the Stim. I'm not getting a RPM signal only (O2 works fine) during the tests at Step 55. I'm doing the Hall sensor ignition and have the three jumpers installed on the main board.
I've gone through the troubleshooting steps here:
Assembling Your MegaSquirt
and I have found the following anomolies:
I have 5V coming to the Stim on pins 26 and 28 as I should.
R9 tests at 5k or 10k (depending on which way I test it with my meter), not 39k as it is spec'ed.
I have 5V into R9 and 1V coming out.
R12 (my RPM pot) has the 1V coming in and 0-1V coming out and going to my AD654 (U1) Pin 4.
I also have 5V going into AD654 (U1) pin 8 as I should.
I read on another thread that people get various readings on R9, but they made it sound like they are getting 0-5V coming from their RPM pot. If it is supposed to be 0-1V then I'm thinking my AD654 is bad, but I wanted to see if anyone had any more suggested tests I can try. No scope so I'm limited in what I can look for coming out of it. Thanks in advance for any help!