How to wire a 4g63 MPI Relay and the ECU & Fuel Pump. Wiring Diagram Below.
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- Опубліковано 8 лип 2024
- MORE 4G63 DSM MPI WIRING DETAILS BELOW:
In this video I show you how to wire a 1G DSM 4G63 MPI relay. A 1G DSM includes the 1990, 1991, 1992, 1993, 1994 Mitsubishi Eclipse, Eagle Talon, and Plymouth Laser. When doing a 4G63 turbo engine swap into another car, this MPI relay is usually the most confusing part of the wiring harness. I do my best to show you what the MPI relay does, and how to properly wire it.
4G63 Wiring Diagrams Here: www.hotrodwiki.com/index.php?...
4G63 MPI Wires:
- Pin 1 - Empty.
- Pin 2 - Black w/ green stripe - Goes to the fuel pump from the MPI relay. Many people rewire their fuel pump with 8 gauge wire to make sure it has a strong battery-fed power feed. If doing this, you can use this factory black w/ green stripe on pin 86 of a Bosch relay. Learn how to properly hard wire your fuel pump in this video: • How to Wire a 5 Pin Au...
- Pin 3 - Black w/ white stripe - Should be given Ignition power. This wire on the MPI relay also goes to pin 110 at the ECU, the Ignition Coil and Power Transistor.
- Pin 4 - Red wire - Goes to Pin 107 and 102 on the ECU. It also jumps over to Pin 5 on the MPI relay, and sends power to the Mass Airflow Sensor, CAS, Wastegate Solenoid, ISC, O2 Sensor, Injector Resistor, Purge Control Solenoid, Fuel Pressure Solenoid, and EGR Solenoid.
- Pin 5 - Connects to Pin 4 on the MPI relay
- Pin 6 - Black wire - Goes to ground.
- Pin 7 - White w/ red stripe - goes to pin 56 at the ECU
- Pin 8 - Black w/ blue stripe - Goes to Pin 63 and 66 at the ECU.
- Pin 9 - Black w/ yellow stripe - This Goes to Pin 108 at the ECU AND the small wire on the engine's starter relay. This should ONLY be given power when the engine is cranking from the starter. The moment you let go of the key (when the engine starts up), this wire should go dead.
- Pin 10 - Black w/ red stripe - This should go to a 20A fuse fed right off the battery.
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Thanks for the swift reply your really a 4g63 guy I appreciate your time invested in shearing information thanks so much have a great day pal
I love learning things like this about our dsm's! Enjoying the awesome vids!
April Stanley thanks! I’m enjoying making them as well!
@@WiringRescue hey jeremy i tried making a profile on hot rod coffe shop but no one has approved me yet. Could you do it? Oh and is there any info about using a 2g harness for this swap? Alli can find is 1g harness info.
Legend just what i needed
YENABO - Thanks! I’m glad that I could help you out.
I have a problem with my 6G72 Montero v6 but not sure what's the problem. I don't ground from the ECU to keep fuel pump running unless I have to ground that wire to the MPI
very good info
Thank you! I appreciate it!
Tq for your explain..now i understand about this...😅😅 god bless you...
Thanks for watching the video. I appreciate it!
This is interesting! Is the relay the same with the 4G15 or 13?
Man, this helps a ton. But it'd be really cool if you did a video going over the harness showing what you do and don't need. So it could be cut out for a cleaner look!
I can definitely do this, but it may not be for a bit, because I have some other big projects in the works.
@@WiringRescue that'd be really cool if you did lol I'm swapping a 4g63t out of a 91 eagle talon tsi awd into a 93 colt. I believe I could get it running off this video alone but you would be highly appreciated if you'd go into great detail what all has to be plugged into the harness, and everything you can cut out and the motor still run and function properly. It would be the most viewed 4g63t swap video ever!!
@@chuckd387 - have you seen my website www.hotrodcoffeeshop.com/forum/viewtopic.php?f=8&t=72 or this 4G63 Wiring Diagram I made? blog.hotrodcoffeeshop.com/wp-content/uploads/2012/08/4g63ecudiagram_1.jpg Both will answer all of your questions :)
Jeremy, my question is about the white connector with the red wire with the black tracer at 1:30 in the video.
Where in the car would that connector/wire be hooked to. The ignition switch?
I take it should be hooked to a switched positive power source?
tpcoachfix - good question! On a 1G DSM there is a white wire that comes off the battery to an 80A fusible link (#1 in the fuse box). That fusible link feeds power to a bunch of things, including another 40A fusible link (#6 in the fuse box). That fusible link has a white wire with a red stripe coming out of it that feeds a bunch of fuses in the fuse box, including 10A fuse #19. That fuse has that red wire with a black stripe that powers up the Ecu.
So - in short, you want to feed that pin 103 at the ECU (known as back-up power) ALL the time, BUT make sure it is on a 10A fuse.
On my last 4G63 swap, I added a 10A fuse circuit to my factory fuse box under the dash. That way everything was totally factory looking/working and generally awesome.
Hey good day can you help me the connector for the idle control valve broke up and I get a new one but i can seem to wire it back up can u help please
Need a help
No signal from (fuse pump relay) pin at ecu
I changed the control relay and ecu and still no signal and pump can not powered after crancking .
Only powered during cranking .
The coil only activated at start position during cranking
The mpi relay has 2 coils right? Are both suposed to click on at the same time or only 1?
SR..where I can buy this full set off harness wire off Mitsubishi adventure...2009 model.
You’ll want to call up local junkyards. That’s probably the only place you’ll find one.
Hey ratty nice video i want to find it the 1994 galant wire harness is the same i thinking doing a swap ..all information will be useful .. bless
If you hook up a cas and spin it, it will also turn on the fuel pump, as the ECU will look for the cas pulses to verify the motor is running.
Joe Riggieri - you are totally right!! Once everything is wired, and turned on, spinning the CAS will turn on the mpi relay. When you stop spinning the CAS, the relay will wait about two seconds and then turn off. If my harness wasn’t cut, I would have loved to have shown this !
wow, how luck that your on the exact harness I'm working on, I'm in desperate need for help, I got rid of all harnesses and basically cut up the mpi relay to power the main engine harness, and figured out that pins 3,4,5(mpi) are switched power supplies that run to pins 102,107,110 on the ecu side and pin 9(mpi) is the constant that goes to pin 108 on ecu side, as well as pin 103 will get separate constant power. I looked at forms and that's what I was told as well as looking at all pins and running the wires back, the problem I now face is that I'm not sure to to wire the switched to the ignition so when I use the starter it sends the signal to the ecu to do its thing, is it as simple as adding another line from the starter signal wire that goes on the starter to go to the 108 pin on the ecu.?sorry for such a complicated question and hopefully u can help me.
do you have more on this and how to make it nice and run good pl i would like to learn more and see more pl
Hi Jeremy this tutorial can work for 4g64? I need to do the wiring for the ECU MD304089, but I don't know if this tutorial works on my case?
Francys Pérez Mora - unfortunately this is definitely not the same as a 4g64. It has a different cylinder head, and therefore different sensors. Some of it may be similar, but it’s probably a small amount.
@@WiringRescue thanks for the quick responde. By any chance do you have or knows where I can find the wiring diagram for 4g64? I have been searching everywhere but nothing 😔 thanks in advance!!
So... I ve a first generation of mitsubishi eclipse (eagle talon) 2.0 liter 150 hp non turbo version. With high atmospheric temperatures I often had some click from the mpi relay and some"switching off" engine during the drive that off course restarted immediately. Not nice if the trip is long under the sun... Never during the "non summer" seasons. But from yesterday I turn the key and I get just click click from that mpi relay... Do I have to replace the ecu boiled from the hot, or the mpi relay? The fact that it clicking means it is working right? Many many thanks in advance...im getting desperate!
jackgaby - from my experience that typically means your ecu has issues, not your mpi relay. I believe that ecmlink still rebuilds these ecu’s if you want to have yours refreshed with new capacitors. Before you do all that though, try jump starting it with jumper cables to make sure it’s not just a dying car battery / alternator.
@@WiringRescue I ll try but I have pretty new battery...and I guess if I push the car in neutral getting some speed and then I turn the key, engine starts... Any how I try. Thanks!
Please Do you have transmission wiring diagram for Mitsubishi l200 animal 2006
I have one to do but it would have been nice if you could have shown Ac wires tack speed in and out if any out charging system maybe you could do another bid with complete wires needed for conversion please
Allan Folkes - thanks for the input. I’ve built a lot of these harnesses for people and so far, nobody has wanted the A/C wires yet! Lol. Luckily, they should be quite easy to hook up! The wires go directly from the ECU to the A/C compressor and temp sensors, which also control the fans. I believe the fans are the only thing that needs power from outside of the ECU harness. The rest is all just connections between the ECU and sensors & A/ C compressor.
The tachometer is tricky because it’s the white wire on the power transistor, but if you plug that into a tach gauge, it causes a misfire in my experience. Another option is to connect the tach gauge to the coil wires, which works, but you will need to have an adjustable gauge that can offset for waste spark. I ended up building something very custom for my 4G63 truck that looked totally factory, and worked great, but it was an epic amount of work.
Lastly - the charging system from the vehicle that the engine is being swapped into is the easiest to use because the Dsm ECU doesn’t connect to it. I have always just used whatever charging wires were already in the car/truck to make the alternator work.
Hope that helps!
-Jeremy
i am really thankful for this tutorial, but maybe you have any idea what is the problem in my build please: 4g63 from hyundai sonata year 93, wires colours are not the same, but i wire like in this vid(constant power, ignition, starter wired) and when i try to start, spark is ok, but injectors wont work, they get +12v for both pins. Also fuel pump pin from relay wont get power. So i feed it with ignition wire. Thank you
Make sure your IAC (throttle body) plug is not swapped with your egr/fpr solenoid plug. They are interchangeable and will give you this problem. Actually follow the wires from the IAC back to the ECU to make sure it’s the correct wires. It’s easy to mix them up. Keep me updated!
I dont see fuel pressure solenoid that could have any connector(only vacuum on fuel rail). And i didnt touched wires like throttle body, o just swapped engine harness with engine and ecu to another car. Feel really lost, trying to fix this problem for a week ;D
Mantas Yo - I would bet some wires are mixed up. Take a look at this wiki I made for 4g63 wiring and compare it with how your car is set up. www.hotrodwiki.com/index.php?title=How_to_wire_a_4g63_engine
Its a fact that something i connected is wrong. I will check where wires go to know what connectors it is. Wire colors of hyundai are different so its bit confusing. I have 2 6pin connectors, MAF and I guess ISC(down the throttle body) same connectors, both have 6 wires. Doesnt matter which i connect, problem still appears
It started!! but there is issue now, that MPI relay manually wont power 4&5pins, so i powered it with ignition, is it okay?
Great Video.. Do you know if the 2g Eclipse wiring harness works the same way?
Similar but not the same. Check this out. www.hotrodwiki.com/index.php?title=How_to_wire_a_2g_4g63_engine
@@WiringRescue don't works the link :(
@@raulmendoza2089- I swapped the link for one that works. Try that out.
I'm having problems with my 1g tsi. I'm getting no spark and no fuel. I think it's this relay but I can't be sure. Is there a way to test this work jumper wires to the replay, or to the plug?
Joseph Anderson - I’d bet that it isn’t this relay. It’s almost always the ecu or the CAS causing that issue. Do you happen to have a spare of either one of those?
@@WiringRescue I do not, but it is the relay. I got help from a couple guys on a forum on how to test my ecu. The new replay will be delivered to me by Friday. I got one from rock auto for $100. I'm planning on sending my computer in to get socketed and dsm link too so if by chance the pins or my meter were lying to me than I guess I'll have to send it in sooner than I planned.
I've delt with the cas, I have 2 spares and I know that isn't the problem. I didn't even check them this time. I was between the ECU and the mfi switch.
Joseph Anderson - awesome! Keep me updated with your findings. I’d love to know the final result, and hear that the car is back to DSM-reliable again!
@@WiringRescue it was the mfi relay. I ordered a new one from Rock Auto. It came Thursday, I put it in and started the car right up. I shut it down as I haven't had time to catch up on maintenance. I won't have time to next weekend to pull it out. I'll be putting a fresh new battery, oil, coolant, and filters in it in my spare time this week. Once I get her out the corner of the garage I'll be checking brakes and belts/tensioner. Then once that's done I'll be cleaning it up and getting ready for paint and sending my ecu to get dsmlink. There's no rust on my MN classic but it's faded through the clear.
Have one that I need help with
Hello dose the 1g dsm uses a injector resistor?
Yes it does!
@@WiringRescue oh bwoy, where can i get one to buy because i pulled this harness out of a 89 galant was a bit hacked up so im following ur videos to power up the harness, i have spark, fuel pump is okay and everything else is fine, is there any way possible to get my injectors to fire without harming them?
There is no signal from (fuse pump relay) pin at ecu
I changed the control relay and ecu and still no signal and pump can not powered after crancking .
Only powered during cranking .
I checked the continuity from control relay to ecu pin and it is ok.
I asked ...why ecu cant send a signal - to control relay to activate the pump after crancking ?
The 4g63 Ecu + mpi relay only sends power to the fuel pump when the engine is turning. So it sounds like you have it wired right. As soon as the engine stops spinning, the fuel pump turns off. You can test this by removing your CAS from the head, and spinning it by hand with the key on. You will hear your mpi relay click and your fuel pump turn on. Then when you stop spinning it, the fuel pump stops and the mpi relay clicks off about 3 seconds later.
I tested the pump by external battery and it is ok.
I then test the pump by opening the ignition switch and then grounded the ecu line at power relay (white red wire) and it is ok.
During cranking the control relay coils energized and after engine running for a while and at the moment i release my hand from ignition switch and it converted from ST position to ON position the pump coil at control relay denregized and engine got stopped .
There is no ground signal from ecu to power relay wire(white and red) which is the ground terminal that energinze the pump coil at relay
I have changed two power relay and distributor and still the same problem.
When i turnning the CAS by hand when the key on there is no clicking at the relay
During spinning CAS by hand there are clicking to injectors only ...no clicking at relay
@@WiringRescue ua-cam.com/users/shortsdkEJIEVXgYU?feature=share
You should do this with a 2g also. If not then maybe I will eventually. But yea. Great info.
PSI Guys - thanks! If I had a 2g harness, I would. Sadly I do not. If you know where I can get one super cheap let me know! Also I have documented a ton of 4g63 wiring info on hotrodwiki.com that may also help you out!
Jeremy N awesome dude I have been using hotrod for a few years now. I’ll be uploading videos here sooner than later. Be on the lookout. Will have dsm content. Aswell as 4g63 sealed mirages, mighty Max’s and eagle summit expo minivans. Plus some other future build plans.
I almost want to see if I have an extra 2g harness for you to make a video for others. I may have a “hacked” 2g harness
PSI Guys - if you do, I’d definitely be interested in it. I’d probably also need to dig up some 2g sensors, but it could be a fun project! I actually want to do a better 1G video too. I have everything to do that already. Just gotta get organized.
Jeremy N I’ll keep in touch. What all sensors would you need for the 2g? Just the mpi relay? Possibly cam and crank sensors?
Could u do a video on 4g93 sohc cb lancer
Javan Neverson - I unfortunately cant because I don’t have any parts for one of those engines.
@@WiringRescue ok thx
Ur fucking awesome
lpucho89 - thanks! Be sure to subscribe and tell your friends to do the same!
Can i know what is the model code of that ecu
I don’t know the part number, but is from a 1991-94 Mitsubishi Eclipse with a 4g63 turbo engine.
4g63 same with 4g92?
I don’t actually know, I typically only mess with 4g63 stuff.
The mpi relay from a 2.0 its the same for a 2.0 t
On 1g dsms "90-"94 mitsubishi eclipse, eagle talon, plymouth laser, the 2.0 dohc non turbo and turbo cars used the same 9 pin mpi relay, however do take note that the "90-"94 1g dsms with the 1.8 non turbo 4g37 base model 1g dsms used a different 8 pin mpi relay.