Just Bought a Megasquirt ECU

[VelocitàPaola]

You already have the wiring diagram for the MS harness, so what are you missing? The wiring diagram for the stock harness? You can download various DSM electrical guides here:

Download Useful Files - SymTech Laboratories: Design, consulting, prototyping, and manufacturing - Megasquirt - FCD's - Manifold Spacers


The relay board isn't really necessary since your car already has the necessary relays and fuses. You won't need the S-FMU, but you will need a 1:1 AFPR (unless you know what you're doing and have a really good reason to stick with the S-FMU).

Keep the missing link for now... if you have the stock PCM controlling spark, it'll help to not have it registering boost pressure from the MAP sensor. If you completely remove the stock PCM you can dump the missing link.

The camshaft position sensor is useless for any MS-I application; just leave it disconnected. If you had MS-II, you could use this sensor for things like COP or sequential injection.

 

[tcavenger99]

ok so my last question is i already cut the stock fuel regulator and all i have regulatinf the fuel is my sfmu so do i have to go get a stock fuel rail before i install megasquirt, or how can i set the sfmu up so it will work. i realy dont want to rewire everything and then have to go on the hunt fore more parts . pluss i was also given 2 coil modules part number lx-301 standard is the brand name any idea how this goes togeather with the coil

 

[Flipboi89]

Why dont you get a 1:1 afpr? Thats what msns is for to control it. Fmu and sfmu are a mechanical way to raise your fuel rate and isnt very accurate unlike msns is.

 

[Cesar]

thx for links

 

[tcavenger99]

OK some clarity please can any of u tell me do i have to make a separate hole in my goose neck for the mega squirt coolant sensor or can i just get ride of mine and use the one with the mega squirt.


second off do i have to install these in line with my coil pack or can i just run the wires direct from the mega squirt to the coil wires.

 

[VelocitàPaola]

If you're leaving the stock PCM installed, you'll need to leave the stock coolant sensor too. It's not possible to share a temperature sensor with the stock PCM and Megasquirt as Megasquirt uses a single bias resistor and the stock PCM uses two.

You must connect your Megasquirt ECU to those ignition modules. Your ECU does not contain internal ignitors and is not capable of controlling the ignition coil directly.

See here for how to connect the ignitors:

MSnS Extra Ignition Hardware Manual

 

[tcavenger99]

ok is this the correct way to hook this up and were do i connect the ?????? to

 

[tcavenger99]

I Am Also Using A Realy Bord Yet When I Hook Up Wires Are These The Ones I Cut Off The Ecu After I Have Labled Then By Color And Wrighting On Wire

 

[tcavenger99]

sorry caps lock was on

 

[tcavenger99]

think i figured it out i use the fidle on the relay board as a 12v ref and connect both 12v to it

Putting this in tomorrow.

 

[VelocitàPaola]

think i figured it out i use the fidle on the relay board as a 12v ref and connect both 12v to it

Putting this in tomorrow.

Wha? The FIDLE output can only handle about 1A maximum. You should not use it for anything other than to drive a relay.

 

[tcavenger99]

ok so were do i get the 12v for the ignition
as stated in diagram above

also i am using a jaw wideban what wire is the siginal wire?

 

[SnoopySLR]

Just a quick question after reading these postings. MS controls your spark as well? The problem I'm having with my car is my ECU will not send out a signal to coil 1. Would I be able to bi-pass my ECU controlled spark all together by installing a MS system?

 

[bullettdsm]

. Would I be able to bi-pass my ECU controlled spark all together by installing a MS system?

Yes,

MSnS = MegaSquirt and Spark

MB

 

[SnoopySLR]

awesome, thanks for the reply. I havent been on the forums in quiet a while. MegaSquirt was just coming out when I was really on here all the time. I'm shocked at how far its come along. Been doing lots of reading about it.

 

[96TurboGS]

awesome, thanks for the reply. I havent been on the forums in quiet a while. MegaSquirt was just coming out when I was really on here all the time. I'm shocked at how far its come along. Been doing lots of reading about it.

There really is no reason to use the stock ecu for anything once going MS. FWIW, I'm now using the sequential code with closed loop IAC; its amazing how much fuel you don't need. (better than stock by far) Give MS2 a try, its opened my eyes. Only problem i'm having is running out of ports to put stuff on.