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 Post subject: "Wiring up a MegaSquirt", For Dummies
PostPosted: Tue Nov 06, 2007 11:55 pm 
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In light of some people recently asking how to wire up there megasquirt, I figured I would make a dummies guide. I will be using my stickied thread from the 1st gen forum to help with this also. See my sticked thread for pcm pinouts.

Megasquirt Pin #/ 1995 Neon PCM Pin #
Pin 1 - not used
Pin 2 - not used
Pin 3 - Shift Light Output / N/A
Pin 4 - Fan Relay Control Output / Pin #19 K17 DB/PK - connect this wire to ms only if using it to control fans
Pin 5 - Boost Control Solenoid / N/A
Pin 6 - Tachometer Signal Output / N/A
Pin 7 - Ground
Pin 8 - Ground
Pin 9 - Ground
Pin 10 - Ground
Pin 11 - Ground
Pin 12 - not used
Pin 13 - not used
Pin 14 - not used
Pin 15 - not used
Pin 16 - not used
Pin 17 - not used
Pin 18 - not used
Pin 19 - Ground
Pin 20 - Mat Signal / Gm IAT or Pin # 6 K21 BK/RD - only connect to this pin if using stock IAT sensor
Pin 21 - CLT Signal / Gm CLT or Pin # 28 K2 TN/DB - only connect to this pin if using stock CLT sensor
Pin 22 - TPS Signal / Pin # 10 K22 OR/DB - send this signal to both ms and stock pcm
Pin 23 - O2 Signal / Wideband Signal or Pin # 8 K41 BK/DG (upstream o2 sensor) - only connect to this pin if using stock o2 sensor
Pin 24 - Tach Signal / Pin # 25 K24 GY/BK - send this signal to both ms and stock pcm
Pin 25 - Knock Sense or Table Switching Input / N/A
Pin 26 - TPS VREF / N/A - this is a 5v reference
Pin 27 - EGT Sender Input / N/A
Pin 28 - 12v To MS / Pin # 54 F18 LG/BK - this is 12v in start and run
Pin 29 - Launch Control Input / N/A
Pin 30 - Fast Idle / N/A
Pin 31 - Ignition Output B / Pin # 1 K19 BK/GY - connect to ms only
Pin 32 - INJ1 / Pin # 4 K11 WT/DB (Injector 1) - connect to ms only
Pin 33 - INJ1 / Pin # 24 K14 LB/BR (Injector 4) - connect to ms only
Pin 34 - INJ2 / Pin # 23 K12 TN (Injector 2) - connect to ms only
Pin 35 - INJ2 / Pin # 3 K13 YL/WT (Injector 3) - connect to ms only
Pin 36 - Ignition Output A / Pin # 21 K17 DB/TN - connect to ms only
Pin 37 - Fuel Pump Output / Pin # 38 K31 BR - this is fuel pump relay ground

Megasquirt Pin #/ 1996-1999 Neon PCM Pin #
Pin 1 - not used
Pin 2 - not used
Pin 3 - Shift Light Output / N/A
Pin 4 - Fan Relay Control Output / Pin # 54 C27 DB/PK (1996) - connect this wire to ms only if using it to control fans
Pin 4 - Fan Relay Control Output / Pin # 18 K173 DG (1997+) - connect this wire to ms only if using it to control fans
Pin 5 - Boost Control Solenoid / N/A
Pin 6 - Tachometer Signal Output / N/A
Pin 7 - Ground
Pin 8 - Ground
Pin 9 - Ground
Pin 10 - Ground
Pin 11 - Ground
Pin 12 - not used
Pin 13 - not used
Pin 14 - not used
Pin 15 - not used
Pin 16 - not used
Pin 17 - not used
Pin 18 - not used
Pin 19 - Ground
Pin 20 - Mat Signal / Gm IAT or Pin # 37 K21 BK/RD - only connect to this pin if using stock IAT sensor
Pin 21 - CLT Signal / Gm CLT or Pin # 26 K2 TN/DB (SOHC) - only connect to this pin if using stock CLT sensor
Pin 21 - CLT Signal / Gm CLT or Pin # 26 K2 TN/BK (DOHC) - only connect to this pin if using stock CLT sensor
Pin 22 - TPS Signal / Pin # 35 K22 OR/LB - send this signal to both ms and stock pcm
Pin 23 - O2 Signal / Wideband Signal or Pin # 30 K41 BK/DG(upstream o2 sensor) - only connect to this pin if using stock o2 sensor
Pin 24 - Tach Signal / Pin # 32 K24 GY/BK - send this signal to both ms and stock pcm
Pin 25 - Knock Sense or Table Switching Input / N/A
Pin 26 - TPS VREF / N/A - this is a 5v reference
Pin 27 - EGT Sender Input / N/A
Pin 28 - 12v To MS / Pin # 20 F12 DB/WT - this is 12v in start and run
Pin 29 - Launch Control Input / N/A
Pin 30 - Fast Idle / N/A
Pin 31 - Ignition Output B / Pin # 3 K17 DB/TN
Pin 32 - INJ1 / Pin # 16 K11 WT/DB (Injector 1) - connect to ms only
Pin 33 - INJ1 / Pin # 16 K14 LB/BR (Injector 4) - connect to ms only
Pin 34 - INJ2 / Pin # 17 K12 TN (Injector 2) - connect to ms only
Pin 35 - INJ2 / Pin # 7 K13 YL/WT (Injector 3) - connect to ms only
Pin 36 - Ignition Output A / Pin # 2 K19 BK/GY
Pin 37 - Fuel Pump Output / Pin # 74 K31 BR - this is fuel pump relay ground

The Neon pin numbers are for the connectors at the PCM. I have also been thinking recently about making some plug and play super420a's but in order for me to do this I would need you megasquirt and an old PCM, Alternator Voltage Regulator, and I would need to know what all sensors you would be using. This would completely get rid of the stock computer and just leave the megasquirt as the only controlling device. Since this would be a complete standalone, if you needed to pass smog you would have to put a stock computer back in because the MS doesnt have OBDII compatability and would cause you to fail.


Last edited by speedjunkie on Sat May 24, 2008 10:53 am, edited 3 times in total.

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 Post subject:
PostPosted: Wed Nov 07, 2007 5:15 am 
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Problem is, there's no standard for some outputs. MS wiring
diagram suggests one, RS uses another, and the 420a mod
sheet uses several, IIRC.

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 Post subject:
PostPosted: Wed Nov 07, 2007 12:07 pm 
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When I wrote this I used the Wiring diagram that rs autosport has on there site for the super 420a. http://www.rs-autosport.net/catalog/docs/RSA_V3-WIRING_Super420A.gif


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 Post subject:
PostPosted: Wed Nov 07, 2007 9:03 pm 
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no one else has anything to add to this? I mean if you think i wasted my time tell me, if i got some of the wires wrong tell me. let me have some feedback


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 Post subject:
PostPosted: Wed Nov 07, 2007 9:58 pm 
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I think it's excellent. I ran an MS in my old '95 Neon Sport for a month or two to prove to myself that it was the factory electronics that were causing my issue. This pinout info would have been very handy. :)
The only suggestion I can think of.. Some pins are just described, while others are ones that you actually have to hook to.. Make the ones you use bold so they stand out better. :) Maybe mention if the connection needs to be CUT, or if you can just piggyback into that signal.. Like the crank sensor, you should just piggyback it.. But the injectors, they'll need to be cut.. etc..

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 Post subject:
PostPosted: Wed Nov 07, 2007 10:25 pm 
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yes please do, I'm getting ready to wire mine up and that would be very helpfull

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 Post subject:
PostPosted: Wed Nov 07, 2007 10:36 pm 
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Una wrote:
...This pinout info would have been very handy. :) ...
...Make the ones you use bold so they stand out better. :) Maybe mention if the connection needs to be CUT, or if you can just piggyback into that signal.. Like the crank sensor, you should just piggyback it.. But the injectors, they'll need to be cut.. etc..


X2, Couldn't have said it better. So would you charge a flat price or base price and like 2.00 per addition? I'd definitely be interested... 8)

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 Post subject:
PostPosted: Wed Nov 07, 2007 10:59 pm 
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SRTMiniMe wrote:
Una wrote:
...This pinout info would have been very handy. :) ...
...Make the ones you use bold so they stand out better. :) Maybe mention if the connection needs to be CUT, or if you can just piggyback into that signal.. Like the crank sensor, you should just piggyback it.. But the injectors, they'll need to be cut.. etc..


X2, Couldn't have said it better. So would you charge a flat price or base price and like 2.00 per addition? I'd definitely be interested... 8)


are you talking about my plug and play retrofit? If so I dont know how much I would charge...but I do need some test mules if your interested pm me.

- edited original post -


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 Post subject:
PostPosted: Thu Nov 08, 2007 10:44 am 
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I'll send all my stuff to you, just let me know what you want and how much you'll do it for. I HATE WIREING STUFF!!!!!

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 Post subject:
PostPosted: Thu Nov 08, 2007 11:38 am 
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onebadazzsrt, pm me


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PostPosted: Thu Nov 08, 2007 1:09 pm 
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onebadazzsrt wrote:
I HATE WIRING STUFF!!!!!

You Sir picked the wrong product then lol

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 Post subject:
PostPosted: Thu Nov 08, 2007 8:20 pm 
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I know but it's the only product we can successfully use when going turbo.

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 Post subject:
PostPosted: Thu Nov 08, 2007 10:57 pm 
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speedjunkie wrote:
no one else has anything to add to this? I mean if you think i wasted my time tell me, if i got some of the wires wrong tell me. let me have some feedback


You have the second set of pin-outs listed as 1996 and up but It is only applicable through the 1999 models.

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 Post subject:
PostPosted: Fri Nov 09, 2007 12:02 am 
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sorry I have been meaning to get the 2nd gen pin outs also...


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 Post subject:
PostPosted: Fri Nov 09, 2007 10:38 am 
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onebadazzsrt wrote:
I know but it's the only product we can successfully use when going turbo.

Yeah, everyone knows there were no turbo Neons before Megasquirt came out, and all turbo Neons use it :8O: :lol:


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PostPosted: Fri Nov 09, 2007 1:08 pm 
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ominous wrote:
onebadazzsrt wrote:
I know but it's the only product we can successfully use when going turbo.

Yeah, everyone knows there were no turbo Neons before Megasquirt came out, and all turbo Neons use it :8O: :lol:


I believe he made that statement because the stock computer is not good for boost whatsoever and the majority now with 1gens are having a lot of sucess with megasquirt.

Just my two sense,
Dave

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 Post subject:
PostPosted: Sat Nov 10, 2007 11:53 pm 
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i vote sticky.

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 Post subject:
PostPosted: Sun Nov 11, 2007 12:12 am 
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Possibly make a diagram, such as the RS Super420a diagram with these pinouts? Would have been helpful when I did the wiring........too bad I just finished.....lol

Just my $.02
Dave

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 Post subject:
PostPosted: Sun Nov 11, 2007 12:13 am 
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Maybe :lol:


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 Post subject:
PostPosted: Sun Nov 11, 2007 12:17 am 
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well im bored, want me to make it....lol

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PostPosted: Sun Nov 11, 2007 1:10 am 
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sure


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PostPosted: Sun Nov 11, 2007 1:18 am 
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one thing that confuses me on this is, the injectors. Are 1 2 paired together and 3 4 or is it 1 4 and 2 3.

I will need to know this asap....lol, i think i reversed them.....oops

Dave

luckily my engine wont be in until next week.

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 Post subject:
PostPosted: Sun Nov 11, 2007 2:11 am 
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the way my megasquirt is connected in my car is 1, 4 paired and 2, 3 paired


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PostPosted: Sun Nov 11, 2007 9:57 am 
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If you are using 2 squirts, the injector pairing is important. With 4 squirts, or 1 squirt it doesn't much matter.

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PostPosted: Sun Nov 11, 2007 10:46 am 
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oh, ok, how would my super420a ecu be set up to do so?

Thanks
Dave

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PostPosted: Wed Dec 05, 2007 1:20 pm 
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speedjunkie thanks for taking initiative and putting this together helps me out since i am a wiring dummie. that's why i;m doing this though...to learn

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 Post subject:
PostPosted: Wed Dec 05, 2007 9:02 pm 
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no problemo


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PostPosted: Sat Dec 08, 2007 4:54 pm 
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i checked the connectors on the pcm...there aren;t any numbers. there's probably a simple answer but how do i find out which pin corresponds to which number so i can connect the MS wires.

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PostPosted: Sat Dec 08, 2007 9:12 pm 
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whenever i get to my apartment i should be able to answer that for sure, but check over in the 1st gen section, i posted up wiring diagrams and its stickied


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PostPosted: Sun Dec 09, 2007 12:15 am 
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found it in the 1G forum....thanks again speedjunkie wish i could mail you a six pack a beer but i can't buy any yet:?

5 more months!!! :drunk: i can buy my own and chill at bars haha

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PostPosted: Sun Dec 09, 2007 1:14 am 
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dont worry i had a few beers in me when i wrote that last reply


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PostPosted: Mon Dec 17, 2007 11:36 am 
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alright need help

i solder the megasquirt wires directly into the corresponding PCM connector numbered pins? then how do i connect the PCM connector with all the MS wires in the way? this isn't right is it...

or do i solder the MS wires on the other side of the PCM connector so it will plug into the PCM without MS wires between the PCM connector and the PCM?

ANYONE.....a pic would really help.

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PostPosted: Mon Dec 17, 2007 1:02 pm 
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You solder onto the wire not the actual connector pins...

splice solder onto the wire a little past the connector ~2-3inches

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PostPosted: Mon Dec 17, 2007 10:21 pm 
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Basic installation its almost same principle as an Apexi. Only 6 cables need to be cut. Figure out common cable on ea inj which its lt grn/or which its the +12V. Do not do anything to that cable. Check on Hayne's repair manual which cable color goes to the ecu for ea inj respectivelly. Just cut the 4 of them and connect them to MS harness. MS brings a diagram telling what goes attached to ea cable for ea inj. Use this post as reference and connect the 4 inj cables. Do the same thing for ignition box's cables. Leave grn/or cable (one in the middle) but cut the other 2 cables, make correct connection to MS ign out A and B. Cable bl/wht its the panel cluster +12V, so hook up the +V source for MS. Connect MS grounds. Then just connect the GM air sensor propertly to the MS harness. Look for a 14mm npt screw on the back of the short block but unscrew it. Use a 1/4" to 3/8" adapter to put the GM Coolant sensor or make an extension for the stock clt sensor to put it in there. Your choise what location to put stock and GM clt sensor. IMO, GM one should be on the head on SOHCs / intake manifold on DOHCs, stock one to be relocated on the back of the engine. This is if you still want to monitor temp using panel cluster temp gauge. If you dont want to use temp gauge just use GM sensor for MS. Then hook the tps MS cable to orage/dk blue cable on car's harness (the one in the middle on the plug but trace it. I'll do all connections around 4" from the ecu's plugs. I will use some extensions for GM sensors.

With this, you should be able to play MS, controling fuel & spark. Your choice if you want the MS to control rad fan. Connection should be simple too. I'll leave that to the ecu for now.

Im intalling mine. Will go to the dyno to make cable connections at all due need to remove the safc so I can pass the map hose thru the hood cable hole. Thers no room for all. Also dont want to use MS and safc @ same time. I can use afc to monitor rpms digitally, o2 sensor and etc but I think I'll get a cheap Palm III for this. I saw them used for $9.99 -> $24.99 on ebay and amazon. Good deal I think. Also getting few buck for my SAFC will help my budget to maybe go for a DOHC head swap or just make an upgrade for a 0007 or 0008 SOHC cam. Im currently using crane 14.

I'll let you know my results when I complete this. Also will post comparison from current setup w/ afx race pcm vs MS.

This install its not hard to do. Mainly need on this is patience & time if you know how to solder, laptop or any device compatible, the dyno and then have fun!

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 Post subject: please help (with pics)
PostPosted: Mon Dec 17, 2007 10:53 pm 
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before i cut up my $50 wiring harness please confirm a few things for me....

does this look right?



[img][img]http://i97.photobucket.com/albums/l202/jaxflyboy/ms-1.jpg[/img][/img]

i read that the neon already has a relay board and the MS realy board doesn't need to be used. i just wanna do whatever is easier.

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PostPosted: Mon Dec 17, 2007 11:44 pm 
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dont use the relay board


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PostPosted: Tue Dec 18, 2007 12:19 am 
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no relay board? then where do the MS wires go after i attach them to the sensors/PCM pinouts? right into the Megasquirt computer unit itself?

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PostPosted: Tue Dec 18, 2007 12:20 am 
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yes....for a more of a beginners installation you might want to check out boost junkies sticky post


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PostPosted: Fri May 23, 2008 8:54 pm 
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Theres a typo in the 95 wiring listing.

pin 21 is listed as DB/PK Radiator Fan Relay Ctrl it should be pin 19.

my diagram says:
pin 19 is DB/PK Radiator Fan Relay Ctrl
pin 21 is DB/TN Ignition Coil #2 Driver

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 Post subject: Re: "Wiring up a MegaSquirt", For Dummies
PostPosted: Fri Oct 17, 2008 3:00 pm 
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97 dohc, i have a set of wiring diagrams for the pcm and the engine, and both list that my 1 and 3 cylinders, and 2 and 4 cylinders are paired together for ignition. the ms diagrams i have list 1/4 and 2/3 pairings. which is correct? or maybe an easier question, do i connect s4 on the ms to ignition "a" on the pcm, or s4 to ignition "b"?

thanks guys

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