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Old 03-15-2007, 02:28 AM   #1
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Default Injector Harness & Ign Coil Outputs

For my '99 I have a CAS from a '97 and from this schematic
http://users.forthnet.gr/ath/twikicore/extwir2.jpg
via Reverant I noticed that the CAS connects to the injector harness. Being a '99 this is not stock wiring for me. Where would be the best place to tap into for this connection when installing the CAS?

Last edited by cjernigan; 03-15-2007 at 04:35 PM.
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Old 03-15-2007, 03:13 AM   #2
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so you are going to use it to trigger megasquirt right? I believe there are 3 wires needed: Power (12v I think), Ground, and the output signal. As long as you use a common ground, you could run any 12v source to it and run the signal wire back to the megasquirt.

Edit, just looked at that schematic, its different from others I have seen. Anyway, it looks like the CAS has 4 wires actually, because there is a CMP and CKP signal. Both of those wires would need to be run back to the megasquirt.
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Old 03-15-2007, 03:17 AM   #3
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K i'll look into that then.
Could you reference me in the general direction of some other schematics that you speak of. Thanks
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Old 03-15-2007, 04:16 AM   #4
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http://www.madracki.com/miata/wiring.html

That site has been very helpful to me. Its really not as complex as it seems, just follow the wiring back to the source. At first when you look at diagrams, it can be confusing, but it makes sense after a bit of studying. For a CAS, you only need it to trigger an RPM signal for the megasquirt and that will be its sole function. When you realize how all those wires work, you will see that it is just a few sensors to determine what the engine is doing (CAS, Temp, Etc) and a few output signals which tell the coils, injectors, etc what to do and when based on what the sensors are telling the ECU.
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Old 03-15-2007, 07:14 AM   #5
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Quote:
Originally Posted by cjernigan View Post
For my '99 I have a CAS from a '97 and from this schematic
http://users.forthnet.gr/ath/twikicore/extwir2.jpg
via Reverant I noticed that the CAS connects to the injector harness.
It's not the injector harness, it's a +12V supply (see how it comes from the main relay?). Get a +12V from the MS board, you need this one to have power while the car is cranking or it will not start!

ALSO, I have certain spark mods done a bit differently (as well as a knock sensor circuit and 3 stage shift lights, so please don't take this diagram as-is, you may burn stuff!

Jim
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Old 03-15-2007, 04:27 PM   #6
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Quote:
Originally Posted by Reverant View Post
It's not the injector harness, it's a +12V supply (see how it comes from the main relay?). Get a +12V from the MS board, you need this one to have power while the car is cranking or it will not start!

ALSO, I have certain spark mods done a bit differently (as well as a knock sensor circuit and 3 stage shift lights, so please don't take this diagram as-is, you may burn stuff!

Jim
Yeah I see how it is connected to the main relay for 12+V thanks for clearing up that confusion. So your spark mods are different I'm having trouble finding good pinout numbers for the coil outputs then. Your's are 3 & 36. Kags are 27 & 29. I'll be running the internal MAP sensor so there are no complications there.


Kags Pinouts
20 - Air Intake Temp (ECU 2P) (red-green)
21 - Coolant Temp (ECU 2Q ) (Blue-White)
22 - Throttle Position sensor (ECU 1N) (Red)
23 - 02 Sensor (ECU 2N) (Red-Blue)
24 - RPM Signal (ECU 2E) (white)
25 - 1A RPM Signal (ECU 2I) (Black-White)
26 - TPS signal 5vref (ECU 2L) (Lt Green White)
27 - 1B Coil (ECU 1G) (Brown-yellow)
28 - Power 12V (ECU 1B) (White Red)
29 - 2A Coil (ECU H) (Brown)
30 - Idle Air Control (ECU 2W)
31 - Not used
32 - 33 - Tied together Injectors (ECU 2U) (Yellow)
34 - 35 - Tied together Injectors (ECU 2V) (Yellow Black)
36 - Not Used - This ignition is not used in my setup (see 27 / 29)
37 - Not Used - I am wiring the FP to come on when the ignition is on at Diag port

Need help with this one, not sure which to use.
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Old 03-15-2007, 06:09 PM   #7
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As per DIYautotunes tech article. Sorry guys, being dumb again.


The Primary tach input (CKP) (Reported to be White on Miatas) is connected to pin 24 on the MegaSquirt's DB37

The Secondary tach input (CMP) (Reported to be Yellow on Miatas) is connected to pin 25 on the MegaSquirt's DB37

When wiring up your ECU later: Spark Output A will come out on pin36, and Spark Output B will come out on pin31.
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Old 03-15-2007, 06:21 PM   #8
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I don't currently remember which pins I used for the spark output on the DB37 connector because I have too many mods (CAS, external MAP sensor, second baro MAP, EGT, launch control, switchable tables) forcing me to take a bit different route than what the diyautotune article said.

Jim
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Old 03-15-2007, 06:32 PM   #9
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your fancy *** megasquirt runs batch injection?
:gay:
Oh, sorry, it's now
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Old 03-15-2007, 07:30 PM   #10
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Quote:
Originally Posted by Ben View Post
your fancy *** megasquirt runs batch injection?
:gay:
Oh, sorry, it's now
wtf? the early stock car runs batch? Sequential is an improvement, but it's hardly the be all ....
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Old 03-15-2007, 07:47 PM   #11
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look at the wiring diagram posted. it shows batch injection, but I don't know what it's from.

Yes, the 1.6 cars are batch injection.
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Old 03-16-2007, 05:20 AM   #12
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Quote:
Originally Posted by Ben View Post
your fancy *** megasquirt runs batch injection?
:gay:
Oh, sorry, it's now
Yes, can you tell the difference between sequential and batch?

Jim
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Old 03-16-2007, 03:11 PM   #13
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Quote:
Originally Posted by Ben View Post
look at the wiring diagram posted. it shows batch injection, but I don't know what it's from.

Yes, the 1.6 cars are batch injection.
what it's from? its the outputs from the Megasquirt with MSnSE. that's why they're Batch as that's all it can do.

why the hate?
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Old 03-16-2007, 04:13 PM   #14
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he's jealous.
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Old 03-16-2007, 04:41 PM   #15
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just an observation.

you MS guys are sensitive like teenage girls. :gay:
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Old 03-16-2007, 04:49 PM   #16
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I have an overly large ****.



(Clerks 2- The Movie)
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Old 03-19-2007, 01:31 AM   #17
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Quote:
Originally Posted by Ben View Post
just an observation.

you MS guys are sensitive like teenage girls. :gay:
its beyond your comprehension, stick with your overpriced named brand, while i still smoke you in my ms powered cars


it may show batch, but everyone and their mother wire it semi-sequential 1-4/2-3
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Old 03-19-2007, 04:39 PM   #18
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Quote:
Originally Posted by Ben View Post
just an observation.

you MS guys are sensitive like teenage girls. :gay:
but you're observing something we're already well aware of, the MS runs batch Injection. Then you precede that with gay smilies.

Who's the immature teenager?
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Old 03-19-2007, 05:15 PM   #19
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Quote:
Originally Posted by richyvrlimited View Post
but you're observing something we're already well aware of, the MS runs batch Injection. Then you precede that with gay smilies.

Who's the immature teenager?
ME
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Old 03-19-2007, 05:30 PM   #20
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Jeezus, not just sensitive, but also sandy 'ginas! I made an observation. I was surprised--that's all.

I welcome to meet any of you MS guys on or off the track.
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