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Old 05-04-2013, 08:32 PM   #1
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Default No tach signal EMS-Pro

I recently installed an ems-pro on my 95 miata, however, I am having a lot of difficulty finding the proper tach signal to make the box function correctly. It seems there is quite few options for tach signals from what I've been reading, but I have found no concrete answers nor have any of the configurations that I have read about worked.
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Old 05-04-2013, 08:38 PM   #2
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Do you mean an MS3-PRO? If so according to the manual here it should be pin 24 on the white connector. I believe you would hook that to a black/white wire in your harness depending on which type of 95 you have.
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Old 05-04-2013, 09:11 PM   #3
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No I have an ems-pro. The black and white wire is 1f i believe. I tried it earlier with no luck. The pin out on the ems pro is a little different. I also have an early 95. 02/95
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Old 05-04-2013, 10:37 PM   #4
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Tach is not ECU controlled in Miata 1990-early 1995. You can confirm early 95 by finding 4 wires to each ignition coil. If you have 3 wires, then you have a late build car.

Assuming early build, you may need to just install a 1k ohm 1/4 watt resistor between IG- and 12V in your under hood diagnostics connector.
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Old 05-04-2013, 11:11 PM   #5
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im having trouble getting the car to start. the box is not getting a tach signal...do you know the dip switch positions for this setup
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Old 05-05-2013, 03:10 PM   #6
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[IMG][/IMG]
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Old 05-05-2013, 04:13 PM   #7
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Im getting power at the CAS but tuner studio is not seeing a tach signal
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Old 05-05-2013, 07:14 PM   #8
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I misunderstood.

DIP switch run down is on page 3 of the installation manual, followed by detailed explanation of functions on the next 2 pages:
http://www.diyautotune.com/downloads..._guide_1_0.pdf
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Old 05-05-2013, 07:34 PM   #9
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i looked through that page a couple times. i am still unclear of 1-2, 1-3, 1-4 and im not sure if i need to use 1-8. this is my first time using a cam and crank sensor for a standalone...on my vw setups i used cdi ignition setup with and msd using my hall effect sensor as a trigger.

current dip switch settings
1-1 down
1-2 down
1-3 down
1-4 up
1-5 up
1-7 down
1-8 down

2-1 down
2-2 down
2-3, 2-4, 2-5 up
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Old 05-06-2013, 12:01 PM   #10
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Don't forget to ground the gray wire with the black stripe - the directions don't quite make it clear, but this needs to be grounded when using the opto in input.
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Old 05-06-2013, 08:40 PM   #11
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.....life saver....thank you im going to try to start this car again shortly...should i be using the cam sensor input for wasted spark?
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Old 05-07-2013, 10:49 AM   #12
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The cam sensor input on a Miata is mandatory with the stock CAS.
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Old 05-07-2013, 11:27 AM   #13
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alright ill put it back on. The CAS only has 4 windows. How should i set this up. The settings here How to MegaSquirt your Mazda Miata dont seem to be working. I get an rpm signal briefly then it stops according to the tuner studio tach anyway.
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