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Old 07-06-2012, 11:40 PM   #1
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Default MS3x installed, tach doesn't work.

Any idea what I can do to troubleshoot my factory tach gauge now that it's not working since installing the MS3x?

Also, if anyone wants to give me a base fuel map/tune for 15 PSI on a GT2554R with 460cc injectors, that'd be awesome
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Old 07-07-2012, 12:46 AM   #2
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Is it getting CAS signal?
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Old 07-07-2012, 02:48 AM   #3
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Yes, been driving it around all night without the tach.

I need to figure out how to AutoTune this thing.
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Old 09-23-2012, 11:19 AM   #4
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Did you ever figure this tach issue out? As soon as I installed my MS2 PNP my tach stopped working. The car runs fine and the megasquirt reads the correct rpms.
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Old 09-23-2012, 11:24 AM   #5
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basic settings > tach out > on | tacho | normal.
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Old 09-23-2012, 11:36 AM   #6
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Quote:
Originally Posted by Braineack View Post
basic settings > tach out > on | tacho | normal.
This, assuming you also hooked up the correct wire in the harness.
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Old 09-23-2012, 03:02 PM   #7
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the brain doesnt put wires in the wrong spot. never happens.
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Old 09-23-2012, 03:18 PM   #8
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The spot happened to be in the wrong place at the wrong time?
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Old 09-24-2012, 06:54 PM   #9
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I feel more retarded than normal. My car hasn't had a tach since I installed the new megasquirt 2 PNP from DIYautotune. About 10 miles of driving after I installed it the car is now running on 2 cylinders. It appears that one coil is not firing. The car is using their base tune, aside from adding some timing and tuning AFR's.

I was under the impression the stock tachometer should work right out of the box with a PNP unit, is that incorrect? Do I need to physically wire the tach output on the megasquirt to the tachometer?

When I go to Tacho Output it is enabled and normal.

The base tune had the dwell settings at 3.0ms, when I contacted DIY for help they suggested I change it to 5.0ms. Would this have fried the coil? I changed it to 3.0ms now, but the coil still doesn't appear to be firing. I could just wire in my COPs, but I hate to install them if something is wrong and they're just going to get fried too.
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MS3x installed, tach doesn't work.-basic.jpg  
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Old 09-24-2012, 10:19 PM   #10
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you dont have ms3. start your own ms2 issue thread
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Old 08-18-2014, 11:32 PM   #11
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Quote:
Originally Posted by Braineack View Post
the brain doesnt put wires in the wrong spot. never happens.
I'm also struggling to find the correct wire into my cluster tach, I've seen the green blue wire mentioned as well at 1h. I'm not using the igniter cuircuit, since I'm cops, was figuring I could run tachometer out (ms3x) direct to my tachometer, but what wire ? Cluster and car is a 1990. Thanks for your help !
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Old 08-19-2014, 08:56 AM   #12
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why not just wire your cops correctly?
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Old 08-19-2014, 07:23 PM   #13
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I believe I did wire them correctly, but then again I'm a noob so I could have misinterpreted the directions. It's actually LS2 coils, not COPS - sorry - I ran a fused 12V Feed and Engine ground, then have the signal wires directly from the MS3X to each coil. I was under the impression Tacho Out on pin 26 could be wired directly to my 1990 tach input signal, am I mistaken ? I did confirm I have the Tacho pullup jumper on JP3 installed.

Thanks !
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Old 08-20-2014, 08:18 PM   #14
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Quote:
Originally Posted by TheV's View Post
I believe I did wire them correctly, but then again I'm a noob so I could have misinterpreted the directions. It's actually LS2 coils, not COPS - sorry - I ran a fused 12V Feed and Engine ground, then have the signal wires directly from the MS3X to each coil. I was under the impression Tacho Out on pin 26 could be wired directly to my 1990 tach input signal, am I mistaken ? I did confirm I have the Tacho pullup jumper on JP3 installed.

Thanks !
Braineack - any thoughts sir ?
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Old 08-20-2014, 09:31 PM   #15
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Quote:
Originally Posted by TheV's View Post
I was under the impression Tacho Out on pin 26 could be wired directly to my 1990 tach input signal, am I mistaken ? I did confirm I have the Tacho pullup jumper on JP3 installed.

Thanks !

not directly, no. gotta wire to the black/white wire, and then jump the yellow/blue wire in the engine harness that used to plug into the Ignitor.
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Old 08-21-2014, 08:28 PM   #16
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Quote:
Originally Posted by Braineack View Post
not directly, no. gotta wire to the black/white wire, and then jump the yellow/blue wire in the engine harness that used to plug into the Ignitor.
OK, let me make sure I got this straight

For the Ignitor connector i do this



And then I wire tacho out to the 2I main harness connector.
Attached Thumbnails
MS3x installed, tach doesn't work.-ignitor%252bconnector.jpg   MS3x installed, tach doesn't work.-cluster%252bconnector.jpg  

Last edited by TheV's; 08-23-2014 at 01:11 PM.
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Old 05-20-2015, 06:21 PM   #17
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Quote:
Originally Posted by TheV's View Post
OK, let me make sure I got this straight

For the Ignitor connector i do this



And then I wire tacho out to the 2I main harness connector.
did this work for you?
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