COP (toyotas) and MS standalone tach issue - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 08-18-2007, 12:07 PM   #1
Miotta FTW!
Thread Starter
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,292
Total Cats: 26
Default COP (toyotas) and MS standalone tach issue

So I got my car up and running on the COPs yesterday. With one issue... I have no Tach.

MS reads rpm fine, but the cluster gets nothing. From my understanding there are 2 wires coming from the ignitor... one for ecu rpm and the other for cluster rpm... those get tied together at the ignitor and being fed the signal from the Tach output of the COPs. I have all four Tach outputs tied together for this.

Thoughts on why I have no tach? I'd kind of prefer to not use the Tacho output on the MS... one less wire to run and one output saved for something else later.

Last edited by Splitime; 08-28-2007 at 08:00 AM.
Splitime is offline   Reply With Quote
Old 08-18-2007, 02:29 PM   #2
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Well that's the suck huh.

Plug in the stock computer with the COPs on. The car won't start (no AFM) but see if the tach reports anything. Cranking speed is like ~300RPM or so.

Then at least we'll know if there's a problem somewhere with the COPs, or if it's something with the MS
Ben is offline   Reply With Quote
Old 08-18-2007, 02:51 PM   #3
Miotta FTW!
Thread Starter
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,292
Total Cats: 26
Default

I get tach no problem with a stock ignitor in.
Splitime is offline   Reply With Quote
Old 08-18-2007, 02:56 PM   #4
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

I had the tach working for the short time I had the car "running" on ms2 in stand alone. So its gotta be your wiring.
neogenesis2004 is offline   Reply With Quote
Old 08-18-2007, 04:51 PM   #5
Miotta FTW!
Thread Starter
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,292
Total Cats: 26
Default

Yah, i just checked it all and it seems good. All of them ohm out to only the plugs they are supposed too.... its frustrating.

I'll give it another go monday night, visiting folks for the rest of the weekend.
Splitime is offline   Reply With Quote
Old 08-18-2007, 05:09 PM   #6
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

soo... you're not going to plug in the stock ecu to see if you have a tach signal with the COPs and stock ecu? the results would be telling.
Ben is offline   Reply With Quote
Old 08-18-2007, 05:11 PM   #7
Miotta FTW!
Thread Starter
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,292
Total Cats: 26
Default

If I can find the stock ecu sure.

When using the stock Ignitor, I get tach signal at the Cluster. This is a 93 and the cluster is driven from the ignitor (if memory serves). With that said, I don't fully see the point of plugging the ecu in.
Splitime is offline   Reply With Quote
Old 08-18-2007, 05:40 PM   #8
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Because if you saw tach signal with the stock ecu & COPs, you'd know the COPs' tach out works and the problem is somehow related with the MS.
If the tach still didn't work, then you know it IS the COPs, human error in their harness, or error on Lazzer's pinouts.
Ben is offline   Reply With Quote
Old 08-18-2007, 06:00 PM   #9
Miotta FTW!
Thread Starter
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,292
Total Cats: 26
Default

But if it works with the MS and the stock ignitor.... then its not the MS.
Splitime is offline   Reply With Quote
Old 08-20-2007, 04:30 AM   #10
Junior Member
 
Join Date: Jun 2005
Location: Huntington Beach, CA
Posts: 354
Total Cats: 0
Default

iWeasel410 is offline   Reply With Quote
Old 08-20-2007, 09:58 PM   #11
Miotta FTW!
Thread Starter
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,292
Total Cats: 26
Default

Quote:
Originally Posted by iWeasel410 View Post
Yah, that'll be the last resort. I wanna have as little excess stuff from my PnP setup as possible... the more wires.. the less PnP :P

I'll be trying it all again tomorrow, working on full exhaust and the hood at my buddies.
Splitime is offline   Reply With Quote
Old 08-28-2007, 04:37 AM   #12
Junior Member
 
Join Date: Mar 2006
Location: Sydney Australia
Posts: 138
Total Cats: 0
Default

Did you get your tach working?

Isn't yours a 1.6?

If so, the ignitor gives the tach signal to the cluster (it feeds the diag connector too).

I borrowed from the COP thread.


Maybe you can tie 2 of the tach outs from the coils to the ecu pin, while the 2 others to the tach pin. Or just bridge the wires.
ampz is offline   Reply With Quote
Old 08-28-2007, 04:44 AM   #13
Senior Member
iTrader: (1)
 
Join Date: Aug 2006
Location: Illinois
Posts: 1,011
Total Cats: 7
Default

Quote:
Originally Posted by Ben View Post
Because if you saw tach signal with the stock ecu & COPs, you'd know the COPs' tach out works and the problem is somehow related with the MS.
If the tach still didn't work, then you know it IS the COPs, human error in their harness, or error on Lazzer's pinouts.
I said that the two wires at the ignitor, for the tach, get tied together at the ignitor. That's how we did honeydesean's and it's working fine. Splitime you said you tied them together at the ecu? From the ignitor, doesn't one go to the ecu and the other to the dash? If so how did you tie them at the ecu?

Pin 4 and 5 in the above picture.
lazzer408 is offline   Reply With Quote
Old 08-28-2007, 08:01 AM   #14
Miotta FTW!
Thread Starter
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,292
Total Cats: 26
Default

Quote:
Originally Posted by lazzer408 View Post
I said that the two wires at the ignitor, for the tach, get tied together at the ignitor. That's how we did honeydesean's and it's working fine. Splitime you said you tied them together at the ecu? From the ignitor, doesn't one go to the ecu and the other to the dash? If so how did you tie them at the ecu?

Pin 4 and 5 in the above picture.
Corrected the first post, I have them tied together inside the Ignitor casing. 4/5 are being fed all 4 tach signals.
Splitime is offline   Reply With Quote
Old 08-28-2007, 04:11 PM   #15
Senior Member
iTrader: (1)
 
Join Date: Aug 2006
Location: Illinois
Posts: 1,011
Total Cats: 7
Default

Ok I just had to make sure. I think I went over all that with you before. Time to find an ecu to try.
lazzer408 is offline   Reply With Quote
Old 08-28-2007, 04:53 PM   #16
Miotta FTW!
Thread Starter
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,292
Total Cats: 26
Default

I'll be taking another stab at this today.
Splitime is offline   Reply With Quote
Old 08-28-2007, 08:17 PM   #17
Junior Member
 
Join Date: Mar 2006
Location: Sydney Australia
Posts: 138
Total Cats: 0
Default

What if the tach signal is different to the ecu signal?
Maybe try to connect 2 cop wires directly to the tach (ie: 1 and 3) with the other 2 cope wires (2 and 4) to the ecu. That way there would be less drain of the signal.

I'm just thinking out loud here and could be way off.
ampz is offline   Reply With Quote
Old 08-28-2007, 08:26 PM   #18
Senior Member
iTrader: (1)
 
Join Date: Aug 2006
Location: Illinois
Posts: 1,011
Total Cats: 7
Default

Quote:
Originally Posted by ampz View Post
What if the tach signal is different to the ecu signal?
Maybe try to connect 2 cop wires directly to the tach (ie: 1 and 3) with the other 2 cope wires (2 and 4) to the ecu. That way there would be less drain of the signal.

I'm just thinking out loud here and could be way off.
+1

Good idea.
lazzer408 is offline   Reply With Quote
Old 08-28-2007, 09:26 PM   #19
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

The tach signal for megasquirt comes from the CAS, it has nothing to do with the coils.
cjernigan is offline   Reply With Quote
Old 08-28-2007, 10:14 PM   #20
Miotta FTW!
Thread Starter
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,292
Total Cats: 26
Default

<-- currently eating a big fat crow.

With COP in. And Tach signal only coming from 1 and 2.
Ecu I get rpm in Cluster... MS I get no rpm in Cluster.

With COP OUT.
Ecu I get rpm. MS I get rpm in Cluster.

WTF
Splitime is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Bizarre connection issue? nick470 MEGAsquirt 1 09-30-2015 11:32 PM
01-05 Fab9 PNP COPs (used) FrankB Miata parts for sale/trade 6 09-30-2015 12:48 PM
Odd Steering issue interestedofold Suspension, Brakes, Drivetrain 5 09-29-2015 02:42 PM
Are my coils failing? viriiguy General Miata Chat 5 09-28-2015 08:39 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 02:15 AM.