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Articles: Electrical & Wiring

Member-submitted articles related to DSM electrical and wiring.
This article is designed to help 2g owners identify all the plugs in the engine bay.The photos and wire colors were based off of a 1999 Eclipse GSX, so other years and models may vary in location and wire color.I would like to give a HUGE thanks to turbosax2 for helping with the photography and the documentation for the article!!The way the tech article will be set up will be as follows:This post will have the master list of all the connectors. Each connector will then have it's own separate post below which will contain a little description and a few pictures and diagrams. The first picture will be an overview shot to show the general location of the plug. The plug will be circled in green. The next picture will show the...
*****IMPORTANT***** Note that the wire color layout diagrams accompanying each picture are as seen FROM the CONTROL HARNESS SIDE of the connector with the release tab (for a male side connector) or locking notch (for a female side connector) on top. That is, you are looking at the wires going into the connector, OPPOSITE the side that is pictured. Like this: How to identify ECU pin numbers. *******************This is the ENGINE CONTROL harness. If you want information on the ENGINE COMPARTMENT harness, see: The 1990 Engine COMPARTMENT Wiring Harness.As we all know, the 1990 model year had many quirks to it when compared to the later model 1Gs. Because this was a single (and the first) year of the Eclipse/Talon/Laser trio...
*****IMPORTANT***** Note that the wire color layout diagrams accompanying each picture are as seen FROM the CONTROL HARNESS SIDE of the connector with the release tab (for a male side connector) or locking notch (for a female side connector) on top. That is, you are looking at the wires going into the connector, OPPOSITE the side that is pictured. Like this: How to identify ECU pin numbers. *******************Consider this part two of The 1990 Engine Control Wiring Harness; this article covers the remaining electrical connections in the 1990 2.0L engine compartment as well as the handful of connectors that run to the interior on the driver side. For reference, the main diagram below is as viewed from the front of the vehicle; the...
So you want to ditch your 30 year old coils and plug wires for something cleaner, but don't want the issues that come with running 300m coils in wasted spark, or the problematic CDI's that tie in with the 300m COP.The EVO community has been using Denso coils for COP with great success in 800+ hp setups with no CDI required. They're a cheap, reliable and comparatitvely powerful coil to the stock DSM coils, however these can eliminate the factory ignition control module, factory coil packs, and the spark plug wires all in one.If you're looking for an ignition improvement over the factory DSM coil packs, chances are these are not going to improve over good OEM coils.There are a few guys that have been successfully running these in...
The 94-96 cars (correct me if I'm mistaken) have a separate cam angle sensor and crank sensor. Other years have them both in one unit on the passenger side of the head.Here is where the CAS is located on these cars:Closeup:You'll first have to make a wiring harness to connect the 1gCAS to the cam angle sensor and crank sensor connector. (Link on how to make this harness: RRE Instructions) step 1 is to cut the wiring harnesses for both. Cut them so you have as much wiring as possible to work with as you have to route the wiring around the back of the motor. Here's where I cut the cam sensor:This is what the connector looks like for the cam angle sensor:Here's the whole pigtail I cut off.If you're...
I see more EVO 1, 2, 3 in North America lately. The engine and drivetrain are very similar to DSM/GVR4, so I think there is no problem to find info for repairs, but I see some people are struggling with electrical issues because of a lack of info. It seems there is not many FSM shared on the internet or I'm not sure if they even exist in English.I have the factory electrical circuit diagrams. But those are paper books and in Japanese. I decided to make it as a PDF file little by little while staying home due to the covid-19 mess, but I would take long to complete since I need to translate from Japanese to English. So if there is someone who really needs some diagram as soon as possible, just let me know. I would take a pic of the...
I started a thread on an electrical issue i was having. And came across lots of 2g 95-96, 97-99 wiring information. But it was across many threads and websites. so i would like to put it all in one place for everybody!This is what i have so far!!!I would like this thread to contain as much electrical as possible for the 2g dsm both 95-96, 97-99 eclipse gst, gsxplease add any and all wiring information or labeled diagrams/pictures you can to this post. if you have a better quality image then someone else please add to the thread. Thanks!-how to post:year of 2g (ex. 95-96, 97-99) short description of what your posting automatic/manual transmission (if known)95-96 2g factory electrical service manual97-99 2g turbo factory...
This article presents the procedure for the ignition system wiring changes when swapping a 1991-1994 ECU into a 1990 car with a 90 wiring harness, gauges, and coil. This procedure corrects the tach signal so your tach works with a 91-94 ECU. This procedure was covered on the KeyDiver web site which I give full credit for presenting the original wiring schematics. The procedure has been removed from the site and this article is provided to replace it. There is another procedure used for the ECU swap ignition wiring but that way is much longer and requires many more parts.converting a 1990 to a 1991-1994 ECU systemFor this process the only part needed is a power transistor from a 1991-1994 2.0 engine (N/T or Turbo).The 1990 coil...
Hey I had to change my O2 sensor so i figured i would make a tech for it while i was doing it.:)You might need to change you O2 sensor if you fouled your old one or just if you want to replace a old crusty one with a fancy new one.tools you might be needing: O2 sensor socket Ratchet with extension Torque wrench anti-seize compound(local car parts store or comes with sensor) New O2 sensor, wires, connector (the o2 sensor im using is the Denso: First time fit, it seems to be the best no reason why you shouldnt get this one, it can take leaded gas and has extra water protection among other things, all for $94 shipped) i got mine from machVthis is what your looking for on the car
We all know an EGT gauge is necessary when you start changing boost levels and fuel trims. It's one of the cheapest forms of insurance we've got. This little gauge allows us to measure the temperature of the exhaust gases leaving the engine via the exhaust manifold.Installation is pretty straight forward. You need to tap the exhaust manifold, screw in the probe, run the wiring inside the car, and wire up your gauge. I took some pics of the process below:Here's a shot of the exhaust manifold before we got started. We removed the heat shield and got marked our number 1 runner.
Materials needed:-15 feet of 4-gauge power or ground wire. Available in many color options from car audio suppliers. Any color but red is okay. Red is universally used for the positive side battery connections so be very careful if you want to use red wire. -8 pair of gold plated ring connector ends for 4-gauge wire from same place. -Rosin core solder. -Wire ties (optional)Tools Needed: -Metric wrench. Socket wrench is good for most connections but you will need a flat wrench for the alternator connection. -Heat source for soldering. A small torch is good. -Wire cutters -KnifeProcedure:1. Cut eight lengths of cable: 1 Battery to firewall. 9” 2 Battery to R strut. 13” 3 Battery to throttle body...
This article is to cover the major points in installing an EGT gauge on your 1g dsm. The 2g dsm installation is the exact same.If you want to install an EGT chances are that you already know what it does and different people want it for different reasons. I got this gauge mainly because I just installed a new motor and ecu and since I didn't have a datalogger at the time I invested in this setup. As we all know this is a very economical setup to make sure you are not running too hot internally.I got this setup for a very nice price ...the list of parts is below:*autometer lite 'pyrometer' gauge *autometer 2 gauge a-pillar pod *TRE EGT probe *Electrical wire (i forget what gauge wire i used) *and of course very important...
We'll start this with the standard disclaimer: This is a modification made to our car. The following article shows you how this was done. You alone take full responsibility for any modification you make to your own car.After having many cars pull out in front of us, seemingly not seeing our low-slung DSM, I wanted to have some lights to help us be seen. When I remembered, I would turn on the parking lights, but often I would forget, until some moron pulled a stupid move.I'm not generally a fan of Daytime Running Lights (DRL), but with all the work that goes into our cars, an insurance check and a body shop are not going to get us our cars back using today's Book values. So, I decided that the coolest I could make DRLs look...
Original Author Richard Montalvo - FacebookPosted here to save the information and make it searchable."Here are total costs associated with this upgrade I just did. - Bosch Throttle body $150 (Amazon) - Billet throttle body flange $90 - Bosch wiring plug $12 - Pedal from a 4G eclipse $15 (Junkyard) - Vibrant cast elbow $35 (local shop) - Torque Solution clamp $85 - Fab work, piping & Labor $200 - Tuner adjusting the Haltech $125 : $712 no tax.Now take into consideration that I did the fab work and welding myself, but I would charge someone $200 to do all this fab work if they brought me their car. Other people may charge less or more. These are straight costs for how I did it. You can save money by not using a cast elbow and...
Since there are a few members that would like to know how a simple relay functions, I drew up this rough drawing to show just how a simple relay operates. I hope it helps out those that are "electrically challenged". Marty
This article is meant to serve as a general guide to get the horn to work with an Nrg short hub or aftermarket steering wheel. Credit goes to this particular article for the idea of using a hose clamp: https://www.dsmtuners.com/threads/how-to-get-your-horn-working-with-an-aftermarket-steering-wheel-using-a-clamp.373149/ Also take note of the picture from this article to see a hacksaw blade used instead of a hose clamp: https://www.dsmtuners.com/threads/cruise-control-switch-relocation-and-horn-connection-with-aftermarket-steering-wheel.222394/ ********Note: I will not be going over srs light or how to maintain airbags Useful Videos: -For disassembly//assembly of nrg setup wheel-To understand the general concept of how the horn works...
Hello fellow DSM folks. I wanted to post this thread to show how to wire the horn with an aftermarket steering wheel without getting the wires all tangled up inside the hub. Hope this helps other people out with the photos and video I took!Tools needed : -18 AWG stranded Wire -Heat Shrink (optional) -Heat Gun (optional) -Wire strippers & crimpers or solder gun (whatever you prefer) -Butt Connectors -Ring Terminals -Female pin terminal (get the ones with a rubber protection on it, so if it touches anything the horn won’t go off) -Hose clamp1. Remove the steering wheel (optional) (find it easier with it off since it’s not in the way)2. Remove the steering column. (2 or 3 screws underneath the column.)3. Find your horn connector...
Disclaimer: I am not responsible for anything done to your car/equipment. Use this information at your own risk. It is possible to damage components if you don't know what you are doing and don't use common sense. Keep in mind do these things at your own risk!That being said, lets get onto the matter at hand:This article explains how to remove connector pins from the ECU harness connectors (as well as other connectors.) You should note that a majority of the harness connectors employ replaceable pins.The reason for this article is to help keep wire cutting/splicing to a minimum, not to mention a cleaner, more professional look. Typical uses for removing pins from connectors includes: clutch cut wire install, and knock light...
ok the pictures are going to be posted in order...so when you see Picture 1...that is picture one and 2 is next one uploaded...here ya go...did it tonightHave a general idea of where you are going to place the unit…..I am putting it on my steering column on top of my turbo timerFirst off you need to find a place to pull all your hoses and connectors through. I found that he steering column boot works well. PICTURE 1You need to tee the boost pressure host for the unit fromt the fuel pressure solenoid which is here ( PICTURE2 So it looks like this PICTURE3 Then run the hose through the firewall to the back of the unit and don’t forget the filter included. This is how I put my boost controller...
Just about every thread that you search will tell you to get bulb 74 for your little Toshiba V-2 sockets for your gauge cluster.This is not the correct bulb size. Do not waste your time buying the 74 bulb.A 74 bulb will fit VERY tightly into the socket, so tight that it will expand/swell the socket to the point that you can't even reinstall it back into the cluster. You could theoretically expand the hole in the gauge cluster or dremel the Toshiba V-2 socket so that there is less material, but why even bother with that when you can get the correct bulb in the first place.If you need to replace a gauge cluster bulb, make sure you purchase the 2723 bulb. This bulb fits perfectly into the Toshiba V-2 socket and installs just like the...
Here is the simple install of a MAFT for blow-thru use. When using DSMlink the white and purple wire are not used. So cut them shorter and tape the ends off (I tucked the 2 wires under the MAFT when I mounted it to the firewall).All you need to do is plug the connector from the translator into the stock MAS plug, make sure the pink wire from the translator lines up with the red wire on the stock MAS plug.The other plug goes to the actual GM MAS.Pull your stock MAS plug from the stock location back to where it comes out of the main engine harness. Then point it towards the firewall. I am going to attach pics to show where to mount the MAFT and how to run the wires so they are all tucked away nicely.
Little break down on why and how i got to this stage. My cars in the UK so we are similer to EU rules and regs so we have only Amber indicators in the rear but when the car was imported so many years ago they rewired some bits took some wires out for the rear and it needed tidying up.So I lost the 4 rear bulbs that are USA regs for brake and indicator, the front wings get side markers and the bumper marker was an indicator. When i recently redid the wiring to get rid of old wires and clean it up i ditched a few bulbs as i dont need them no more and this caused me some issues even before LED bulbs! I bought some LED bulbs that had build in resisters but clearly were not enough for the system and not able to compensate for it.The fix...
I wanted a small and obscure switch to turn on my fans, and I found it right in front of me.Step 1: acquire cheap flashlight from harbor freight.step 2: take the rubber grommet off and pull out the switchstep 3: remove rear wiper plug and mark spot to drill. Be careful, it's a tight fit. Final hole size is 5/16"step 4: solder some wires to the switch and epoxy it instep 5: enjoy your small cheap switch with a very satisfying clickNote the quick disconnect connector. It'll make installing and removing the vents alot easier.On a 2g the ecu controls the fan. Connecting pin 20 to ground will activate both fans on hi and connecting to pin 21 will activate the cooling fan on low. pin 20 is the green/orange on the...
I have fought with DSM alternators for years and I'm sick of the $120+ cost of replacing a weak 65amp stock unit. There are rewound units that put out 105 and 135amps but at a cost of $175-$250 I say no thank you. If you have a few basic tools a a little bit of time here is your answer.Tools needed:basic hand tools: wrenchs and sockets small grinder or dremel soldering ironParts needed:Saturn Alternator from a 93-99 Saturn 1.9L dohc ( 1996 Saturn SC2 dohc )I did the mock-up on a spare motor and have also done this on my car. It took about 30 minutes using a dremel.The benefit is a more powerful and CHEAPER alternator.Saturn, meet Mitsubishi:The alternator needs to be clearanced to allow it to rotate...
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