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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...
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...
*****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...
This article is intended to be a guide for those of you who want to make your own cop setup. This is a start to finish write-up that covers the materials and tools needed, assembly, wiring, and installation to make your own coil-on-plug setup. Please note, while I used all new parts for my setup which were somewhat costly, this write-up can be followed with used parts and a homemade plate. I just happened to have extra cash in my budget for this project. Without further delay, here is the write-up.Tools/ Equipment: Wire stripper Wire cutter Allen wrench set Wrench/Socket set Soldering Iron Electrical Tape Wire wrap Rosin core solder High grade automotive wire Calipers (optional)Parts and Prices: JMFabrications COP...
TO FIND A SHORT or battery drain, first switch off and disconnect the obvious devices (eg. taillights if blowing taillight fuse) to see if the fuse still blows or the battery current drain disappears. (See below "FOR THE CASE OF AN UNKNOWN BATTERY DRAIN" for more on how to detect a battery drain.) Also try disconnecting everything that is or may be on that fuse's circuit or anything suspicious or recently worked on that's electrical or not stock (eg. aftermarket alarm or radio). Disconnect anything electrical that doesn't work since it may be the problem. Examine and wiggle the wiring and connectors on the things you disconnect to see if they are frayed, broken, melted, wet, or touching other wires or metal (and while you're...
Install a high flow cat or eliminate it all together? Tired of the check engine light? Did you try the spark plug non-fouler trick to no avail? Then build your own O2 sensor simulator.*note* You would be modifying your vehicle in a way the factory never intended. If something goes wrong and you mess something up, I am in no way responsible.First, the parts list: (all from Radio Shack)(1) 3" x 6" project enclosure (1) Universal perf board (cut it to fit the enclosure) (1) 271-1134 1m Ohm resistor (1) 272-1055 1.0 micro-farad metal film capacitor (2) 271-133 50 ohm 10 watt resistors (These are two packs. You need 4 resistors total)Step one: Remove your driver's seat and the center console.Step two: Locate the wire for the...
Oxygen Sensor Wiring:For 1g: (From DSM Backup manual for 91 DOHC turbo) Looking from the wire side, the harness round connector has pin 1 in upper left, 2 upper right, 3 lower left, 4 lower right. This would also be the way it looks on the sensor round connector if looking at the connector with the wires on it's opposite side. (Can also see here: http://www.dsmtuners.com/forums/bolt-tech/171244-o2-sensor-wiring.html#post1431571)Harness side: Red (pin 3 - goes to mpi relay for power) and black (pin 4 - goes to ground) are the heaters. White (pin 1 - goes to ECU pin 4) is signal. Black (pin 2) is signal ground (goes to engine ground on a 1g). The signal and signal ground are usually shielded.Sensor side: Every after market O2 has...
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...
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...
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...
The purpose of this install guide is to install AEM's UEGO Wideband kit into a turbo 2G eclipse in place of the stock O2 sensor without using some kind of narrowband emulation like DSMlink. There are a number of ways to install the gauge on DSMtuners but there wasn't one that focused on installing it in the stock front O2 sensor standalone. I did much research on this before and the main benefit of this is: - You don't need to weld an O2 sensor bung into your exhaust - The front O2 sensor position is a good place to install the Wideband sensor - You get the advantages of having a quicker reacting and more accurate O2 sensor for you ECU - You don't need to add an O2 sensor to your car your merely replacing one. - You get a wideband...
How to test the power transistors (aka. ignition module or ignitor):This test will check the power transistors for go/no go operation. If it fails your transistor(s) are bad. Note that the power transistors may still be weak, intermittent, or fail with temperature which this test does not check for (although you can often make bad ones fail when you heat them with a hair dryer or heat gun which I strongly recommend).Background: This test is better than the one in the manuals (which use an ohmmeter) for the following reasons:1) The manual version requires an analog ohmmeter which most people don't have and can't get easily anymore (and why buy one for just this test?). A digital one, which all people have in their multimeter, will...
Similar to vfaq's tutorial I will show you how to create a rear o2 bypass/simulator using parts available from your local radio shack.Parts needed: 1 - Mohm resistor 3 - 50ohm/10watt resistors 1 - 1µF capacitor(It is possible to use other variations than the 50ohm/10watt resistors I have chosen, like I said this is what was available. Myself and others have proven that they work perfectly fine)I began by gathering all the parts required and I personally purchased a cheap aluminum box to contain everything once finished. To establish the best connection I would highly recommend soldering each connection. (also available at radio shack)One option would be to remove the entire sensor and line from the vehicle and attach it to...
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...
I have seen a lot of threads about this, so I'm making a Tech Article.If your car occasionally has both the battery and brake light come on for a few seconds and then goes away - keep reading.As we all know the purpose of the alternator is keep the battery charged while you drive the car. Alternators are made up of 4 parts: 1) Rotor 2) Stator 3) Rectifiers or Diode pack/bridge 4) Voltage RegulatorROTOR - The rotor is basically a magnet that loops around many copper wires around an iron core.STATOR - The loops of wires around the core is the stator.RECTIFIERS OR DIODE BRIDGE/PACK - An alternator provides AC current, while the car runs on DC current - rectifiers or a diode bridge/pack consists of several diodes (which allow one...
AEM UEGO WIDEBAND Install/Review Rick InacioThe AEM UEGO wideband gauge is a "MUST" for all tuners and boosted cars. With it's 0-5v output, it has the capability of logging with just about any stand alone unit out there. The UEGO is a 52mm gauge that makes it a perfect fit for any gauge pod or any custom mounting location. With easy to read interface air/fuel LCD display, it also shows 3 diffeant colours showing me just how lean or rish my car is running. The single channel AEM unit is accurate to a 0.1 air/fuel ratio and also comes with a Bosch 02 sensor (#30-4100). The UEGO needs no laptop or any other type of moniter to make it read. It's 24 Color-coded LED display lights provide immediate reading to engine’s air/fuel ratio or...
INTRODUCTION I notice there are not that many install guides for installing the Apexi Super AFC, usually its because the links are so old you can't find them. So I decided to write one up with pictures and good diagrams. I'm doing this write up for the 2G turbo's, I am not sure if the 1G or any others car is the same. I do know for sure that that the 2GNT install is totally different as the ECU is in the engine bay and it uses a MAP sensor. I also did this with the first SAFC, for the AFC, SAFCII, or SAFC NEO I am not sure if it is exactly the same. Another note is that this install guide will cover basic installation/wiring and setup. For tuning info you'd best look at the many other guides on tuners.INSTALL TIME This took me...
This is my very first Tech article, I still do not have much access to the site but I have been a member for a long time and have learned a lot from reading at this site. I am hoping this will clear things up for anyone doing the fuel pump rewire on a 2g car.These numbers are on the relay right next to the terminals * 30 - feed wire from battery * 87A - Not used * 87 - when cutting stock 12V pump wire, this is to the pump * 86 - when cutting stock 12V pump wire, this is to the car * 85 - when cutting stock ground wire, this is to the carThis is a Diagram that shows all the connections that are made for the fuel pump rewire.In this picture on the left is the white plug that plugs into the fuel...
Here is a diagram showing how to route the spark plug wires from the coil pack to the cylinders.Special thanks to femmeDSM for making this diagram.Here is a link to a thread with more information and a discussion on the topic: http://www.dsmtuners.com/forums/maintenance-repairs/10465-firing-order-merged-5-7-a.html
This is a write up on how to wire in a GM IAT (intake air temp) sensor in a 2g and logging it using dsmlink V3. If you want to make the switch to run a SD (speed density) setup but aren't sure how to wire in your IAT your in the right place. Since you'll also need to connect a MAP sensor to go SD you'll also want to read Wiring & Logging a AEM 3.5bar MAP Sensor if you haven't already.First you'll need to get a GM IAT sensor, harness, and a 3/8" NPT bung and have it welded into a UICP. ECMTuning sells it as a kit direct from their site, just click on this link. GM IAT sensor w/pigtail and 3/8 bungINSTALLATIONOnce you get the bung welded onto your UICP thread the sensor into it and tighten it down with a wrench, then...
I recently just redid the entire audio setup in my vehicle, and it took me a few searches here and there to get the proper information needed, so I figure I throw everything together to help those in the future.This is for those of you who are planning to upgrade your factory deck and amp. For those hoping to get an aftermarket 4-channel amplifier to power some aftermarket speakers, the information here should help you out a lot.I would recommend removing the passenger seat. It's 4 14mm bolts on each corner. Pry out the bolt covers with a flathead or just carefully popping them out by hand.You should see the Inifinity factory amp. Unplug the wiring harness from the amp and the 6-pin din cable. If you are upgrading the deck along...
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 write up was done using the Street Tuned Motorsports (STM) Fuel Pump Rewire kit, it comes with all the necessary hardware you'll need. Heres a quick link to the FP Rewire kit they sell STM FUEL PUMP REWIRE KITEven though the GS-T and GSX have different wiring going to the fuel pump the rewire is the same, depending on your car just follow the diagrams below. If you can't tell by the diagrams below where the wires tap into the relay heres a quick list.#30 (blue wire) - feed wire from battery. #87A (red wire) - NOT USED. #87 (yellow wire) - when cutting stock 12V pump wire, this is to the pump side. #86 (black wire) - when cutting stock 12V pump wire, this is to the car side. #85 (white wire) - chassis ground...
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.
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