S10 bad ecm

General Motors (GM) engine control modules are programmed and flashed to meet your vehicles requirements. However, there are clues drivers can watch out for to determine if their ECM may be going bad. This is the computer that controls the engine. Share this post. Stored in the main memory chip (PROM) is the software (values programmed by GM or your custom tuner) that tell the computer, among other things, how much fuel and spark to deliver to the engine for a given set of operating conditions. This is the description of a Code 44 as set on GM products It is an indication of a lean mixture as indicated by the oxygen sensor readings. wanted to kno if i could swap it with a 98 sonoma motor. Temperature sensor, dont know exactly what the ECM does with the 7 Nov 2014 If efficiency of the car, fuel economy or drops in performance is unexplained after normal checkups, it is usually caused because of a faulty ECM 16 Feb 2014 Started checking fuses and the ECM fuse was blown. If you can get your hands on another ECM, try swapping that in and see what happens. It's probably the ECM B fuse that is blowing on you. If you need a pinout chart for the ECM plug, I'll need the engine size. I have tested the electrical wiring11/09/2006 · FWIW, I found this in an old post. Since then its been in the shop in the first attempt to replace the motor. To test your Honda Main Relay, first connect Pin 2 terminal on your relay to the positive terminal on your battery and the negative to Pin 1 terminal. You will have to have it repaired before you'll be able to use the truck again. ecm. ECM MODES OF OPERATION . I think your problem lies elsewhere. Each computer will use a different harness, as the ECM connectors are different, and the harness dimensions change as well. Unit runs fine. Aug 30, 2012 http://www. This section is concerned with the Getrag transmissions (transaxle and transfer case) in the AWD turbocharged models (3000GT VR4 and Stealth R/T Twin Turbo). The truck ran fine until I had a battery issue, the battery had broken inside and did not have a good enough conection to start the truck or even for the lights to come on. 3 L engine vortex will turn over but won't start. There is a ground connection near the thermostat housing. the transmission will not shift. A malfunctioning throttle position sensor will relay bad data to your car's computer and usually result in poor fuel economy. 7 tbi. Sometimes this can be misleading, because you don't know for sure if the cause is a bad solenoid, dirt in the valve body, or a bad signal from the ECM. its not under the dashboard , under the car , or under the muffler shield those are just guessing. is where you scan in diagram below. If the converter, for whatever reason, fails to signal the End-Of-Conversion (EOC) before a timeout counter runs down, the ECM assumes it is bad and sets this code. 15/06/2009 · Does this sound like an ECM failure, If the ign was on when you jump started it the BCM is probably bad. 1. No starts, Rough running, Stalling . The PCM code read that it was the crDoes sound like a full control type of problem, could be a fuel pump or you might have a bad fuel injector. . Follow the Reddiquette, above all else. Looking for best Engine Control Module for your Chevy S10? Find great deals on AutoPartsWarehouse, get free shipping over $50. You might also like /r/mini_trucks. Don't start the engine. I have replaced the ignition coil and the pickup under the distributor. 2 seconds of wheel spin and it still takes nearly a second to shift from first to second for some reason There's always some acceleration during those times but definitely room for improvement. I want to focus mostly on the other Japanese turbo models produced 1988 Chevy C/K pickup with ECM trouble code 22 (throttle position sensor), check engine light and high rpm. com, the place dedicated to that DTC (diagnostic trouble code) P0420. The following circuit wiring diagram may be of help: 1991-1993 2. I replaced the valve and now when I star to recharge the system thThis is a new section devoted to other makes and models. If replacing the ECM, be sure to transfer both the PROM and the CALPACK from the old unit. Read the posts here to learn more. Ecm 1 fuse blowing - As soon as I turn the key on my 1999 s10 blazer the ecm 1 fuse blows what could cause this? Plugs cap rotor wires and crankshaft 29/06/2013 · 96 Chevy S10 Blazer with 4. - The TSB for 1999 Toyota Corolla suggests replacing the ECM with an updated part as a repair for the diagnostic trouble code P0446. A bad fuel injector will either deliver more fuel or less fuel to the engine, or fails to operate at the right time. How can I fix it? - Answered by a verified Chevy Mechanic Yep. (Under the hood)I have a 2005 Wrangler Unlimited with an automatic transmission and my PCM went bad. A Chevrolet's ECM can sense problems as they present themselves, and it keeps an ongoing record. Eaton is a leading diversified power management company Understanding and helping our customers succeed • Listening and understanding to requirements and The throttle position sensor, TPS for short, is a sensor that is used in an internal combustion engine. Please sign up to our newsletter for the latest products and discounts! CHEVY S10 ENGINE SWAP chevy S10 and the Transmission is bad in it, will a transmission out of a 2000 S10 with a 2. This 2004 Chevy Trailblazer came in with multiple concerns. used to have a lot of switchs go bad S10 Blazer with a 4WD problem? once the controller is screwed to the ecm behind the glove box i checked every thing the The GM 16197427 ECM can be used as a stand-alone 4l80E transmission controller. RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. If the problem goes away, your diagnosis was correct. Intermittent Bad Ignition Switch Causes Low Power and No Blower Motor. Came in with 5 lbs of fuel pressure and barely running. The distributor shaft sprocket was worn down so bad that it had finally lost contact with the cam-shaft and stopped turning the distributor rotor. It has a 2 wire connector and is located in the intake manifold very close to the thermostat housing. I bypassed the wire harness and jumpered the fuel pump and it starts and runs. 3 engine work. We are not responsible for reprogramming your ECU. 8L v6 engine. Found ModuleGods and hit the jackpot. ECM number 16198259 is equivalent and can be used in its place without any problems. "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth. It will take me a while to populate it. The Engine Control Module monitors the Evaporative Emission System Vent Valve/Solenoid system wiring for opens or shorts. World's leading marketplace. Had a bad miss under load. hey guys, this one continues to set a code 32. This is an accurate sign that the ignition switch problem could be rooted in the electrical system. Symptoms Of A Bad Ignition Control Module. Pull out the "ECM-B" fuse. OK, the list of possible things that can go wrong looks pretty long but it is rare to see (or have) two different components go BAD from two separate systems at the same time. I thought these things never fail especially at only 103,500 miles! Called the local Honda dealership they're telling me $1,550 to replace. Turn the key on. 8L motor. If you suspect bad gas, drain the tank and refill it with fresh gas. carjunky. Description Chevrolet ECM Repair Electronic Control Module Repair. Tap the Cruise Control wire into the single wire on the 1 wire connector on the old vss buffer. Ignition modules are a large transistor that switches the current to the ignition coil on and off just like points did in older cars. but no ground. Buy products related to 1993 chevy c3500 fuel injector products and see what customers say about 1993 chevy c3500 fuel injector products on Amazon. a bad fuse. GM did have a lot of Engine Computer trouble around that time period, and they often acted like they had bad solder connections, but given the age of the truck, that computer has probably been replaced a couple of times already. Custom Chip / ECM / PCM Reprogramming & Tuning. The engine control module (ECM), also commonly referred to as the engine control unit (ECU) or powertrain control module (PCM), is one of the most important components found on virtually all modern vehicles. Either of these conditions can lower the engine's efficiency and cause the "Check Engine" light to glow. I had that happen on my 87 S10, the ecm is a silver metal box ECM's rarely go bad. Some of those vehicles used a “spyder” fuel injector that had 6 hard plastic fuel lines that attached to each cylinder. 2016If you have antifreeze in the ECM, that's a strong indication you have a leaking heater core. It is the central control unit of most vehicles and controls a variety of functions, such as electrical system power distribution, emissions, ignition, and fuel systems. 3L vortec motor, first thing I noticed is the fuel gauge doesn’t work properly, reads full most of the time, occasionaly the low fuel level indicator light comes on and it shows empty, never between full and empty, always one or the other Bad gas can cause an engine to run rough or stall. The same computer was used both for 305 and for 350 engines. But I can't make a whole lot of sense out of them. 3 vacuum diagram 1986 chevy el camino vacuum hose diagram 1999 chevy venture engine diagram An ECM in full control (O2 sensor cycling) is said to be in close loop because of the close-circuit action of O2 sensor-to ECM-to injector pulse control then to O2 sensor and back to the ECM. Then you can post it up here and we can tell you what ecm's you can interchange it with. 2. Sorry for the bad news but it would be cheaper to replace the 98 GoECM offers Chevrolet ECM with a lifetime warranty. 45 volts between the appropriate terminals of the sensor. I guess what i'm asking is why would GM put three different wire harnesses in an s10 for the same year same engine?CHEVYTHUNDER. But you may get symptoms of stalling,lack of power,bad fuel milage, and many mor … e things that just don't seem right If that cylinder is misfiring bad enough, it could be pouring unburned gas into the exhaust which can mess up the air/fuel mixture and cause the ECM to compensate by leaning the mixture down too 1999 CHEVROLET S10 Engine Control Computers also known as (ECC / ECM / PCM / Module / etc. IAC counts are how the ECM knows where the position of the stepper motor is, in relation to fully closed or fully open. several websites regarding these symptoms people have suggested the ECM is bad, 27 Apr 2015 fuel filter I have tried anything someone says…like loose or bad gas cap can let Everybody I know who's ever owned a Chevy S10 has replaced just The ECM grounds below the carpet on all the S-10s I am familiar with. The main issue was intermittent low power. Why? - The RPM's fluttered and it died. Most of all when jumpin the ecm connector under the dash I can no longer get the ecm to go into test mode and blink the trouble codes. SYMPTOMS OF A BAD ECM IN 2005 CHEVY SILVERADO 4. PCM reset procedure. Do not attempt to start the engine. But most people don't have that option. Quality Remanufactured Unit; Covers all listed engine sizes. bad ground. I'd bet dollars to doughnuts you have a fuel pump going bad. could the ignition switch be bad or is it something else. When the computer generates a fault code, it means that there is something wrong with one of the vehicle's critical systems—typically a sensor related to the emissions control system. The ECM checks this by initiating a conversion and timing how long it takes to complete. These can be fuel injected engines or carbureted engines. Chevy 4. 14/06/2012 · Does a GM oil pressure switch serve as a fuel cutoff ? C/K Car Forums28/11/2010 · My Chevy has no power to fuel pump. 3L. This sub is dedicated the the Chevrolet S10 pickup truck, also sold as the GMC Sonoma/S15 and the Isuzu Hombre, along with the Chevrolet Blazer, GMC Jimmy, and Oldsmobile Bravada SUVs. please and thank you. If the egr valve is bad it will cause your car to run lean(too much or not enough gasoline to air mix)Leaving your car with that type of problem will just make you burn out cylinders, then your motor is basically junk. Anyone have any thoughts, or know if a dealer can check the ECM? Thanks in advance for the help. Some of the current Chevy trucks and SUVs are the Colorado, Silverado, Avalanche, Tahoe, and Suburban. I know it does with the ECM on our Volvo Construction equipment so I thought it was worth a try. I purchased in Oct 2018. If you think your sensor has failed, here are some common symptoms of a bad crankshaft sensor that can help you in I'm going with a 350 vortec engine just have to do a little work with the ecm and Injectors wiring for them been doing a lot of reading on it don't seem to be that bad to do # 7 ( permalink ) over, how bad do you want this 1994 S10 Brake Light Wiring Diagram Ebook Download. It is important to determine if the misfire or lack of injector pulse is the result of an ECM strategy to save the engine from damage or an actual malfunction. If you can’t find the right ohms you might have to buy a few of them to get the number you are looking for. ECM's rarely go bad Verify +B 12v on connector one side heater circuit. 3L ECU ECM Engine Control Module 16244210 (Fits: Chevrolet S10) This is a OEM ECM ECU Engine Computer Module was pulled out of a1996 Chevy S10 Regular Cab 4. Tested fine. on your truck, pull the ecm down from behind the glove box. For example, if you have decided to run a 90-92 system (MAP), you can use a 1227730 ECM (mounts in the passenger compartment) or a 1227727 ECM (mounts in the engine compartment). intake hi i have a 1998 chevy s10 4 cyl 2. i am almost positive there is a short in the electrical system somewhere. The factory ECM/PCM has a Learning capability which allows it to make corrections for minor variations in the fuel system to improve performance and driveability. The first can be easily fixed by replacing the oxygen sensor and the code reset. I have the same truck and it quit running while driving on the highway. The TPS is used to monitor the position of the throttle butterfly valve. 2000 Chevrolet S10 vehicles have 24 reported problems. The computer on your Chevy S10 ultimately controls a variety of vehicle functions from air and fuel delivery to generating and storing fault codes. 2l chaged the ignintion module but it still blows the ECM1 fuse but not when the module is pluged in could a coil pak be bad i know there are no wires shorting out a … Re: 92 s10 Bad ECM? Dangerous to rely on wire colors since it is all too easy to splice in a wire of a different color, that is why i actually put in the pins on the plug. ECM = engine control , S10-S15-Sonoma / Isuzu Hombre / Olds Achieva, Cutlass Ciera / Pontiac Grand Am 26/04/2015 · Some reason you are not getting command for start up green/white wire? usually . Ok, I have a 95 S10 with the 4. could i have a bad ecm. or flaky ignition switch. How can I fix it? - Answered by a verified Chevy Mechanic19/06/2010 · Got a chevy k2500 with a 5. Other side goes to ECM which completes the path. I'm starting to lean towards it being a bad ECM (going to take it to the dealer tomorrow to see if they can test it). Where is the fuel pump fuse on a 1991 Chevy Blazer S10? The fuel pump relay is mounted on the firewall above the power steering. com/articles/When_To_Replace_PCM. The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Your Check Engine Light won’t always come on when the ECM malfunctions. We sincerely hope that whatever we give to you could be useful. Add to Cart. The guy I bought it from found a running 4. You - 1996 Chevy S10 Wiring Diagram - 1993 Toyota Camry Wiring Diagram The light blue wire leading from the fuel injector to the Electronic Control Module (ECM) could be pinched, or exposed and grounding out, causing the injector to open intermittently. Not having a good working ECM is a serious problem in keeping your vehicle running. Testing for a bad electronic control module (ECM), sometimes called an electronic control unit, requires the use of computer diagnostic equipment. the module or coil i think. ( that gives information to ECM )Ecm 1 fuse blowing - As soon as I turn the key on my 1999 s10 blazer the ecm 1 fuse blows what could cause this? Plugs cap rotor wires and crankshaft 29/06/2013 · 96 Chevy S10 Blazer with 4. We offer high quality new, OEM, aftermarket and remanufactured Chevrolet S10 Electronic Control Unit parts. 1990 s10 cold idle problems S-10 Car Forums . Cost $340 with labor and parts. One time I checked it the reading was only 8V. Some of these codes pertain to the ECM itself. The 94 Plus EEPROM is even larger. If the old ECM also indicated PROM failure (Code 51) or a bad CALPACK (Code 52), be sure to verify these components are fully operational in the new unit. There are many reasons why you could have an faulty ECU. again, how bad do you want this 1999 Chevy Ecm Wiring Diagram Epub Download. Pin 6 – To ECM/PCM Connector A11 and A24 for Fuel Pump; Pin 7 – To Battery . The auto portion of the ECM should not make the engine idle too high. I want to focus mostly on the other Japanese turbo models produced 11/08/2016 · bad torque converter symptoms Problem Diagnosis Car ForumsFICM REPLACEMENT. or flaky ignition switch. To better understand how fuel trim numbers are generated, the ECM/PCM uses the oxygen sensor or air/fuel sensor input signal to adjust fuel injector pulse-width values. Beck Arnley is a leading provider of quality automotive parts equivalent to OE structure, fit, and performance together with the hard-to-find merchandise for cars, light trucks, and SUVs. 3L V6 TBI. 89 chevy k15 TBI idle problems Page1 - Discuss Super Chevy, Tech Talk, and Chevy Technical Discussion topics in the Super Chevy forums at Super Chevy Magazine. Some Chevrolets have multiple interior fuse boxes including in the trunk - the video above will show you where the interior fuse box of your 1999 S10 is located. Bad fuel injector 4. Contact us if you think your ficm is bad and needs The ECM in my s10 Blazer has no power input for the fuel pump. 2017-09-08. The code can be caused by checking timing, bad ESC module, bad ECM, wiring problems, etc. Things are pointing to a bad ECM but before you can condemn the ECM, you have to verify all the power supplies and grounds coming into it. Some of those vehicles used a “spyder” fuel injector This is a new section devoted to other makes and models. Note about the ECM cables: when disconnected from ECM, line up red and blue cables and look into their ends from the ECMs viewpoint. I figured bad gas (bp in Des Moines looked run down), > or water in the tank. This is a wonderful pricing strategy if you are trying to purchase long-time period customers. There is no coil reaction for the fuel pump relay. symptoms of bad map sensor chevy s10 We apologize if the article about map sensor symptoms chevy is not what you expect. ECM 20A Fuse in '02 S10 was created by Bluestreak66 That fuse is for continuous ecm power as well as power to the fuel pump though a relay. 8L Chevy S10 Ignition System Circuit Diagram. Here's a short list of symptoms: Check Engine Light (CEL) on. 2002 CHEVROLET S10 Engine Control Computers also known as (ECC / ECM / PCM / Module / etc. com FREE DELIVERY 24/08/2012 · My 2002 Chevy S10 A/C unit goes on and off - The freon had leaked out from a bad vale. If a longer-than-normal injector pulse width is required to maintain the desired ­oxygen sensor signal, the ECM/PCM displays an ­increased fuel trim value in its datastream. We sell wholesale to the public. I am going to share a secrete with you on how you can bypass these systems with very little effort. The computer in every fuel-injected car must know two things before it can figure out the correct cold-start air/fuel mixture: the engine coolant temperature and the outside air temperature. org website. You should get the file at once - 95 S10 Blazer Interior Wiring 1999 Chevy s10 ECM price? So yeah, my car randomly decided to die as I entered the highway on the first day of classes. The first thing I did (when I managed to limp it back home) was change out my fuel filter, but that didn't fix the problem. A bad PCM, or power train control module, has a check engine light that does not turn off, an assortment of random codes, intermediate stalling issues and poor engine performance. 3 engine diagram 2004 chevy trailblazer engine diagram chevy s10 vacuum line diagram chevy astro van vacuum line diagram s10 4. The fuel pump is on the same circuit. The "Check Engine" light will illuminate when the ECM (engine control module) receives a signal from a sensor that is out of its parameter. On there you will see an piece of white paper stuck to it with the service number. 3/700R4 with a bad trans, and an engine that probably hasn't been run in 2 years. 7L Cummins Diesel PCM ECM ECU Engine Computer. A P0420 code is a trouble code on OBD-II equipped vehicles. 3 L engine vortex will turn over but won't start. The ECM sets the OBDII code when EVAP Vent Valve/Solenoid is not to factory specifications. Easy to use parts catalog. It is possible for the module to produce spark without the computer getting a reference pulse. The 89 4. This is a really unique security system bypass kit that you can use to override your current factory theft system on your GM vehicle. When this happened, the customer said that the Electronic Throttle Control, ABS, Traction Control, and sometimes the 4WD lights would come on. bleepinjeep. We are dedicated to tuning your vehicle's engine computer to attain maximum performance and the best drivability possible while keeping the powertrain reliable. 3L Pickup. My Chevy has no power to fuel pump. When the problem first began, it felt like just bad gas. The van has an electronic 4L60e transmission. 2 I felt a little hesitation like it was time to change the spark plugs. for 98 s10 is in the front under the hood on the passenger side right where the antifreeze resevoir is . By disabling all engine related flags and piggy-backing the harness to your existing ECM you can use your current ECM for engine management and the 16197427 for transmission control. The ECM is a computer, and features many of the same parts as the computer you have at home or at work. com FREE DELIVERY Ecm 1 fuse blowing - As soon as I turn the key on my 1999 s10 blazer the ecm 1 fuse blows what could cause this? Plugs cap rotor wires and crankshaft 29/06/2013 · 96 Chevy S10 Blazer with 4. Put a new fuel pump in it & - Answered by a verified Chevy 08/10/2013 · So about a month ago i threw a rod in my 3. Trouble Code 55 indicates that the Analog- to-Digital (A/D) converter in the ECM timed out. Bad idle control valve 5. com/ - All the best Off-road videos of YouTube in one spot without all the boring stuff - Updated Daily!! In this video I'll  Dead or Faulty ECU? Here are a few ideas and solutions www. If you have to pump the gas pedal in the morning to keep your car running, you may have a bad engine coolant temperature sensor. We can save you the time and money by testing your ECU DME before spending on costly Ecm 1 fuse blowing - As soon as I turn the key on my 1999 s10 blazer the ecm 1 fuse blows what could cause this? Plugs cap rotor wires and crankshaft 96 Chevy S10 Blazer with 4. the other diagram i left shows a fuel module. So i will ask you repeatedly, how bad do you want this Chevy S10 Wiring Diagram Radio Epub Download. Could be a poor connection at the ECT sensor, or even a ground. But we'll finish off with the most likely cause -- bad ECM. How can we help you? Please select below. then coil ignition modual, and last the spider injector. Find best value and selection for your 1999 Chevy S10 Truck Engine Computer ECM 2 2 Programmed search on eBay. 2008 Dodge Ram 6. ecm. The 1st point (inj. To make this short, sweet, and to the point; the engine is not going to start due to a lack of spark and or fuel injection when the ignition control module (ICM) fails on your 2. I don't remember if the late 80's ECM's used the EPROM or not, but you want to avoid having to swap that EPROM if you have to. So i will ask you repeatedly, how bad do you want this 1999 Chevy Ecm Wiring Diagram PDF Download. Model specific subject matter experts, classified ads and more. I bought a remanufactured P0154 02 Sensor No Activity Circuit B2S1 OBD-II Trouble Code Technical Description15/03/2012 · could i have a bad ecm - driving down the road lost all power shut down and wouldnt start and has no spark24/08/2012 · My 2002 Chevy S10 A/C unit goes on and off - The freon had leaked out from a bad vale. when the fuse goes back in, all of the lights work but the starter will not crank, then the fuse blows. TBI Wiring Harness Conversion ! First you need to go to junk yard and pull the engine EFI harness or complete system if you can. You might have a bad ground, causing voltage problems to the ECM. I had that happen on my 87 S10, the ecm is a silver metal box located on the right side underneath the dash board and is held in with a bolt. 2001 S10 4. The most commonly reported 2000 Chevrolet S10 problem is: ABS Light Due to Brake System Control Unit my 96 s10 has a blown engine. ) The 1999 Chevrolet Blazer has 1 problems reported for ecm fuse blows. The ignition switch is connected to a series of high-resistance wires and any of the terminals connecting these wires can overheat. Code 53- The ecm has detected a system over voltage. 2 there is a bad connection or too much resistance in the wire feeding the ECM. 3 TBI idle problems - CarJunkyTraduzir esta páginaautoforums. Try to find an ECM from the exact vehicle as you have. > FREE expert answers to automotive questions20/06/2009 · Chevy Forums FREE technical assistance for your restoration and repair. I have a 91 s10 with a TBI 4. 0 emulator or the emulation facilities of the APU1 to make changes while the vehicle is running. The throttle position sensor in your engine transmits information about the position of your throttle to the electronic control module or ECM. Still won't run. Does this sound like a poor ground, wire short, bad ignition column cylinder, or trans sensor or other? I have seen others with this issue on the net but have not seen a direct answer for 2002 s10 v6 automatic. A bad FICM can cause many problems for Ford Diesel Trucks. The ECM is a simple computer that runs software programs. I agree that the Crank Sensor could be a problem, But, the fuel pump needs to prime first and you should be getting Data on the DLC, even if the crank sensor is bad. If you need a Chevy ECM not listed here, call us to check availability. I would first start with checking fuel pressure at the engine with a manual fuel pressure gauge and go from there. > FREE expert answers to automotive questions14/06/2012 · Does a GM oil pressure switch serve as a fuel cutoff ? C/K Car Forums28/11/2010 · My Chevy has no power to fuel pump. A much more common cause of fuel-related misfires on fuel injected engines is too much air and not enough fuel (lean misfire). This article explains the core functions of the ECM. Re: BAd ECM Computer Will do probably in the next day or two I will just solder it to the two connectors a pain to get them on otherwise Do you think they need connected separately? 1989 s10 P/u 262 6 cyl ext cab tahoe. The usual symptoms associated with a bad ECM are Ignition or Injector issues, Idle Air Control issues, no communication and such. " - Sherlock Holmes It ran a 9. The ECM or Engine Control Module of your car monitors all the sensors in the vehicle to make sure that all the conditions are operating normally. It would surge some, and the gas pedal felt intermittent. The sensor uses two wires. over and over, how bad do you want this Caterpillar C15 Ecm Wiring Diagram 07 Full - S10 Blazer 4x4 Wiring Schematic - Renault Trafic Wiring Diagram Download So i will ask you again, how bad do you want this Mins N14 Ecm Wiring Diagram Full Download. Why? - The RPM's fluttered and it died. I have a 1991 Chevy S10 with the 4. The ECM expects to see no voltage on the EST line during this condition. The Engine Control Module (ECM) also known as the Powertrain Control Module (PCM), Engine Control Unit (ECU), or simply Auto Engine Computer (Automotive Engine Control Module) is the brain of the vehicle. Weak fuel pump 3. by the ECM. The ecmb fuse keeps blowing. If it doesn't replace the fuel pump and the connector at the top of the tank. ECM Repair and gauge cluster Repair with mileage correction. s10 bad ecm Free 1 Year Warranty and Shipping Included. htmlWhen to Replace Your PCM (and when not to) - An Article from the OBDII not one for an internal PCM fault, in which case the PCM would be saying it is faulty). I brought the crank sensor and the ignition control module to town with me this morning in hopes that the local Auto Parts store can check them. Let us repair your bad ABS module! Typically, these rascals will go bad and need to be replaced, that's right replaced. Few days ago my wile driving my 1995 S10 2. loose antenna loose ground on the fender where the antenna is mounted could also be a bad alternator. Most of the General Motors PCM, ECM and ECU module units are labeled plug & play and will not require additional programming. im just wondering if someone has a clue where it might be or has had this problem and give me advice on what they did. AutoZone Repair Guide for your Chassis Electrical Wiring Diagrams Wiring Diagrams Start here to order an Auto Ecm / Ecu engine computer . 84 with 1. Like plugs , wires , cap , rotor if bad , and service the ECM by unplugging and spraying with a WD40 like product. Tap the ECM wire into the brown wire on the 3 wire connector on the old vss buffer. The PCM code read that it was the cr Does sound like a full control type of problem, could be a fuel pump or you might have a bad fuel injector. WHEN TO REPLACE YOUR PCM (AND WHEN NOT TO) - OBD-II www. Chevy Trucks and SUVs Questions including "How do you replace speakers in a 1999 Chevy pick-up" and "How do you reset the clock time in a 1993 Chevy Suburban"23/03/2016 · Recognizing symptoms of a bad EGR valve will help you troubleshoot potential problems sooner and restore engine performance faster. If you feel a odd vibration and hear a funny noise from the area of the gas pedal, check and see if your distributor is the issue. This can result in misleading test 24 July 2000 CURING THE FUEL INJECTOR BLUES This ASNU machine used by Linder Technical Services can be used to both test and recondition CPI injector assemblies. standard cab, 4. You should get the file at once - 98 Jetta Ecm Wiring Diagram ECM is the 83-1 code while 86-1 is failure of communication with network. 3 of the same era and had it in the bed of the truck. Pursuing for Toyota Ecm Wiring Diagram Ebook Do you really need this file of Toyota Ecm how bad do you want this Toyota Ecm Wiring - S10 Fuel Filter Location A bad coolant sensor that prevents the engine control system from going into closed loop can also make the fuel mixture run rich, and possibly rich enough to foul out the spark plugs. please help, thank you. Detecting Engine Control Module Problems. Sonnax makes an overdrive servo that will hold more and cause less slippage(if the ecm sees too much slippage it will do some wierd stuff also) mostly code 1870 will pop up on check engine light. htmlThere are many reasons why you could have an faulty ECU. there is service bulletin for 1996 models to where you add a ground wire to the ecm and without this update the tcc will not lockup properly or might i had a 1997 s10 4. > was shaking so hard. It has an adjustable 1. It can be VATS, Passkey or Passlock anti theft system that is going bad causing your issue. For most GM Cars and Trucks (EFI only & for off-road-use only applications). Feb 8, 2018 Is your ECM giving you problems, call today for assistance. If that is the case try unplugging the fuel pump and crank the engine and see if it blows. 2L Four Cylinder Chevy S10 Performance Upgrades, including MagnaFlow Performance's Exhaust and several aftermarket parts in this issue of Sport Truck Magazine. You - Detroit Diesel 60 Ecm Wiring Diagram - Dvi I To Vga Wiring Diagram After a chip adapter has been installed in an ECM, tuning can begin. 2l also but it has a bad trans. Leave the key in the “ON” position for approximately 11 minutes. Generally, if you unplug the TCC solenoid at the transmission and the symptoms go away, you have found the problem. Because the ignition is pointless the timing should not change (8 deg) but check it. Are you searching for a replacement ECM/PCM for your Chevrolet S10 Pick Up Truck? You've come to the right place! We offer a wide variety of ECM models. Shop ABS-ECU-ECM-EBCM-COMPUTER-REBUILD. I am thinking that the ECM may be bad and not sending a consistent 12V to the relay. Last but not least, check for continuity from pin #2 on the DLC, to C4-#11 of the ECM, harness side, this is the serial data wire from the DLC to the ECM. Circuit description: The ECM supplies a voltage of about . There were some sensors that were bad for sure, oil sending unit, water temp sensor and the EGR valve but the main problem was the computer. TBI Fuel Injection Conversion using a GM TBI EFI system! One of the most popular EFI conversions to older Chevy engines or any engine for that matter is the GM TBI system using the 1227747 ECM. The only difference between the two engine sizes was the PROM that was used. when i take it out the starter will crank but no start, no headlights, interior lights, radio. The ECM must be getting a coolant temp signal. Bad fuel pressure regulator 2. The ECM assigns each fault and malfunction a code, which corresponds with General Motors standardized descriptions. 2008 Cadillac Escalade ECM Engine Control Module 2008 Cadillac Escalade ESCM Electronic Suspension Control Module 2008 Cadillac Escalade FPCM Fuel Pump Control Module 2008 Cadillac Escalade HVAC Heating, Ventilation, and Air Conditioning 2008 Cadillac Escalade IPC Instrument Panel Cluster 2008 Cadillac Escalade ONSA OnStar Activation I know it does with the ECM on our Volvo Construction equipment so I thought it was worth a try. The counts should be in the 10 to 15 count range, but can vary some, and will have a higher count at higher elevation, or for a fresh rebuilt engine. Most modules will be go into sleep mode within seconds or minutes after shutdown. It was also sold from 1996 to 2000 by Toyota as the Hombre. One being a ground from the ECM, the other being the resistance to ground signal back to the ECM. The ECM must be in control at all times except during warm up, WOT, power enrichment, and deceleration mode. Insert ignition key and turn to the “ON” position. 3 v6 engine diagram 2005 chevy 4. Put a new fuel pump in it & - Answered by a verified Chevy P0154 02 Sensor No Activity Circuit B2S1 OBD-II Trouble Code Technical DescriptionOur Blazer is having trouble starting and we can hear the fuel pump coming on when we try to start it. Start by checking for intake leaks, intake gaskets are a common caused of multi-cylinder misfiring. After I ran it down to under a 1/2 tank I put in some > other gas. If the obd1 code 13 remains, it means the wiring connection from the oxygen sensor to the ecm terminal is buggered up. Another symptom of a bad ignition switch is if it is overly hot when touched. The annual maintenance cost of a 2000 Chevrolet S10 is $416. 1996 Chevy S10 Regular Cab 4. Module Experts provides a full line of Chevrolet ECM Repair. Why do you need to know? So you can replace it? Bad idea, over 90% of the time they are not bad but people continue to blame the mysterious box. I put a piece of card board inbetween the crank sensor. 2 So far, the coolant temp sensor was replaced, the O2 sensor, the egr valve, fuel pump and new plugs ,wires and new battery and no change. Repair and maintenance costs vary depending on age, mileage, location and shop. I DO have the 12V from the orange wire(pin 5), which is hot all the time from ECMb fuse. Connect the scanner and check the IAC counts. Can't say how ECM controls this but 12v should carry thru sensor heater to ECM before circuit will operate. The most commonly reported 2000 Chevrolet S10 problem is: ABS Light Due to Brake System Control Unit the ecm (engine control module AKA computer) fuse keeps blowing causing the car to automatically shut off while i am driving down the street. i am almost Status: ResolvidoRespostas: 61991 Chevy S-10 4. 24/08/2012 · My 2002 Chevy S10 A/C unit goes on and off - The freon had leaked out from a bad vale. I bought a remanufactured P0154 02 Sensor No Activity Circuit B2S1 OBD-II Trouble Code Technical Description25/07/2010 · OK by CTS you mean Temerature sensor (for the ECM) not the Temp Switch (for the guage)??? That would cause a rich condition, and poor idle, driveability. . chart says bad wiring to ecm or bad ecm, wiring is ECM COMPONENTS AND COMPONENT FUNCTION A DRAC from a S10 blazer with ABS brakes. A Few Days Later I Was Out In The computer needs to receive a distributor reference pulse from the distributor module to trigger the injectors. How? According to thefactory Service manual the engine coolat temperature sensor is something that, when bad, can cause a rough idle, misfire, and general porr running of the engine. The most common symptom of a bad ignition module is that the engine dies and won’t restart. Whether or not you are looking for a Remanufactured Chevrolet ECM tomorrow or looking to send yours into be rebuilt we have your solution. i have a 98 sonoma with a 2. a bad fuse. There are a number of reasons why a crankshaft position sensor can fail, and a number of symptoms associated with that failure. Dealers and repair shops deal with these problems by what we call the shotgun approach (fixing something by replacing many things or one big thing). The ECM, or electronic control module, is the computer responsible for controlling all of the engine management functions. My 99 S10 with the 4. This is the description of a Code 45 as set on GM products It is an indication of a rich mixture as indicated by the oxygen sensor readings. Had the Ignition Module checked. There are two learning features. or start. The ECM is flashed with the new software direct from the manufacturer’s website. There's a microprocessor that receives, interprets and reacts to sensor inputs as fast as they occur. Welcome to P0420. There will be a lot of extra things, don't worry about them now grab it all as whole as you can. A bad distributor module or wiring between the module and the ECM/PCM can cause this. Average repair cost is $700 at 155,350 miles. obdii. ecm, ecu, pcm, bcm repair supply, performance programming, for ford, mercury, gm, chevy, chevrolet, pontiac, buick, cummins diesel ecu, ecu repairs near me The ECU/ECM could be the problem, but i doubt it, I am not real knowledgable with the GMs. You should chk that first before you replace the Why does the computer go bad, let me see, how long does a normal . The timing is preset and when the ECM commands sleep mode, if the device does not shut down within 5 seconds of the command, even 1 additional second will set this code. ECM problems often manifest themselves in common ways. ) Code 42 - Electronic Spark Timing Circuit (EST) Circuit Description. If cranking voltage is above 9 volts while cranking and there is still no fuel spraying the issue is in the fuel delivery system. The cool thing is, is that there is a diagnostic strategy that you can use to figure out exactly what's wrong with your particular No Start problem. If these voltages are greater than . Read some of the stories on how to do it right but the way to wire the resistor i told you is the right way. Special Price: $129. Regular price: $199. I also acquired a 94 Chevy van with 350 TBI. Ended up being a bad computer. You should get the file at once - 95 S10 Blazer Interior Wiring So i will ask you again, how bad do you want this Mins N14 Ecm Wiring Diagram Full Download. Please verify availablility of discounts and parts. And it's composed of hardware (a pretty standard circuit board) that's encoded with software usually . 2L bolt up to the 2. You should get the file at once - S10 Blazer Purge Solenoid again, how bad do you want this 1999 Chevy Ecm Wiring Diagram Epub Download. A faulty computer may cause the vehicle to intermittently have issues such 12 fev. If your car's check engine light is on, get that code read in case it's a P0420. You can burn chips using a ROM burner such as the BURN1/2. Four banger 2. If the problem persists more tests needs to be done to 1991 Chevrolet S10 - Sputtering, hiccups, stalling, bad acceleration Read more 86 1986 Chevrolet S10 Blazer Fuel Injector 2. Engine has never skipped a beat during all this RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. Vacuum leak under the hood somewhere. The ECM, or ECU, controls various engine operations in your vehicle. a excessive number of new customers. com › … › Engine Troubleshooting27/11/2009 · I have a 1991 Chevy S-10 2WD with the old ecm, or the one I got from another S-10 all the time but I had one that just ran bad @ idle & smoothed out 23/03/2014 · It is a 16144288 it's the only ecm for a 92. When the system is running on the Ignition Module, that is, no voltage on the by-pass line, the Ignition Module grounds the EST signal. Chevrolet Wiring Diagram. that situation does sound like the ECM isnt sending impulses to the injector. This shouldn’t cause the symptoms you describe. Connect the Speedometer wire to pin 11 on the new cluster harness (I'll cover that later). 3, I bought the truck with a bad knock in the bottom end of the engine. The Chevrolet V6 has become a very important Jeep conversions engine, and is swapped into many Jeeps with great frequency now. Some issues that I think may be related to a bad ecm. Simply put, it is the fuse for you cars computer that controls all or most of … the electronic engine controls. The ECM uses this information in several different ways, Welcome to our GM programming page. 1991 Chevrolet S-10 91 S10 With Blown Ecm Fuse I Bought This Truck About A Week Ago And Drove It About 300 Miles Back To My Hometown With No Trouble At All. Low fuel pressure will cause these symptoms and will cause it to throw O2 sensor codes when in all likelihood they were fine. COM wrong information, defective memcal, bad connection from memcal and ecm socket. It consists of mechanical parts which may become worn and require replacement. S. A coolant sensor – this is the sensor that tells the ECM (the onboard computer) ho cold it is and in turn the computer tells the injectors to make the air/fuel mixture leaner or richer. I did disconnect the ECM connectors and the next time I drove it the light stayed out, I drove for 30 minutes and shut it off let it set for an hour or two and when I started it up again the light was on. 87 Chevy Ecm Wiring Diagram connections routing theory of operation etc on the first gen s10 s i am under investigation it was in really bad shape Now I have Introduced in 1982, Chevy S-10 is a pickup truck manufactured by General Motor’s Chevrolet brand. Now check for continuity between Pin 5 and Pin 4 of the PGM-FI relay. 87 Burban. Sinister Performance, LLC. ecudoctors. Where do you find the ECM in a 1990 Chevrolet S-10 Blazer? Where is blower motor relay on 2001 s-10? Where is relay switch for the air compressor 97 s10 pick-up? Where is starter fuse link on 1997 Chevrolet S-10 located? Where is the AC drain line on a 2003 Chevrolet S-10? Where is the AC high speed relay on a 2000 Chevrolet S10? Chevy S10 - $2017 Challenge and beyond. It got so bad that it would cut out at traffic lights. The best way to test for a bad ECM, is to substitute a known good ECM. If they are not, they too will have to be replaced. Beck Arnley Crankshaft Position Sensor. 00. Use this contact form to provide us with the make and model of your vehicle. Re: 92 S10 trouble codes Reply #2 – Tuesday, Nov 01, 2005, 07:31 PM The ECM isn't going to know anything about the electric transfer case on a 92, but here's a list of the codes. Even replaced the Spark Control Module. 3 have a TBI fuel injection system and the ecm on the 98 will not work and the bad news is that the ecm on the 98 also controls the transmission shift points and the 89 will not, so even if you swap the ecm to have the 89 4. We The 1986-89 ECM contains a 128K EPROM, 90-92 ECM's use a 256K EPROM. The computer tells the Control Module in the Distributor how much to advance/retard spark, but the Control Module actually tells the Coil when to fire based on information from the ECM and the 2000 S10 2. 2L Chevy Cavalier or Pontiac Sunfire, the car will suffer a misfire condition or a No Spark No Start Condition. some chain stores have a roll out alternator tester they can check for AC voltage on the battery circuit. I had to do that 10 minute test three times so it could jive with the ECM. But I think there is a sensor with engine temp linked to the throttle body. 3L V6 ENGINE TURNS OVER BUT WILL NOT START - Chevrolet 2005 Silverado 1500 2WD question 2004 Chevy Blazer S10/S15 ECM ECU PCM Engine Computer. I replaced cap rotor plugs wires, mainly because they looked bad. If no leak is found the next step is to replace the spark plugs. Thank you for visiting the altcar. 2 Liter broke down on the road and after checking I replaced the fuel pump but still wont start. Once the form has been submitted a technician will respond by phone or email to discuss your options. I have a sales question I need technical assistance I need the status of my order Dependable remanufactured ECM - Electronic Control Modules, ECU - Electronic Control Units, at a fraction of the cost of a new unit. 5L out and switch the Ground in wires to ECM terminal 1 and 21 Open in wires to ECM terminals 21 or 22: Code will set as soon as malfunction occurs ===== 34 Vacuum Sensor (Manifold Absolute Pressure (MAP) ) "Spark knock" "No power" "Poor fuel economy" Ground in wire to ECM terminal 20 Open in wires to ECM terminals 20, 21 or 22 Short in wires to ECM terminals 20 and 21 Ground in wires to ECM terminal 1 and 21 Open in wires to ECM terminals 21 or 22: Code will set as soon as malfunction occurs ===== 34 Vacuum Sensor (Manifold Absolute Pressure (MAP) ) "Spark knock" "No power" "Poor fuel economy" Ground in wire to ECM terminal 20 Open in wires to ECM terminals 20, 21 or 22 Short in wires to ECM terminals 20 and 21 Difference Between A BAD Fuel Pump And An Anti-Theft System (PassLock) Failure One of the things that can have you replacing a good fuel pump is an anti-theft system (PassLock) failure. com/ecu-fault. Dependable remanufactured ECM - Electronic Control Modules, ECU - Electronic Control Units, at a fraction of the cost of a new unit. I really think I can squeeze 8 something 0-60 times out of this bad boy as is. The parts store now says I may have a bad ECM. ASAP Speedometer Repair - Speedometer Odometer and Module Repair in Phoenix AZ - PHONE: 480-464-ASAP. 3-liter Vortec V6 can prevent the propane from being evenly dis-tributed among the cylinders. 8L V6 GB Remanufacturing Read more Chev / GMC Misfire, poppet injector diagnosis, troubleshooting and replacement Read more The Chevrolet V6 has become a very important Jeep conversions engine, and is swapped into many Jeeps with great frequency now. It could be a faulty sensor or the … sensor may be doing its job reporting a problem to the ECM. 2008 Cadillac Escalade ECM Engine Control Module 2008 Cadillac Escalade ESCM Electronic Suspension Control Module 2008 Cadillac Escalade FPCM Fuel Pump Control Module 2008 Cadillac Escalade HVAC Heating, Ventilation, and Air Conditioning 2008 Cadillac Escalade IPC Instrument Panel Cluster 2008 Cadillac Escalade ONSA OnStar Activation ECM = electronic control module. The oxygen sensor itself is bad The purple wire connection to the ecm is no good. Free shipping in continental U. Feb 12, 2016 2 open injector drivers, 2 injector drivers firing twice every cycle. Return to Chart If you get no response, bad ECM or a bad wire/fuse going to or from it. Here is a better diagram to look over. the ecm (engine control module AKA computer) fuse keeps blowing causing the car to automatically shut off while i am driving down the street. ECM are: <c> IAC Idle Air Control, <c> Fuel Pump Relay, <c> the two fuel injectors, <c> and the spark timing. ECM, it cetera. I bought a remanufactured . 1998 chevy s10: cyl. P0154 02 Sensor No Activity Circuit B2S1 OBD-II Trouble Code Technical Description Chevrolet is known for its medium-duty commercial trucks and sport utility vehicles (SUV). F wires are on the left of the blue connector, E's on the right. Often it will often restart once the engine and module cool off. I have a 96 s10 that keeps blown the ecm battery 20amp fuse, no code but random misfire, do i need a new ecm or is it a short??? 4 Answers. Ecm 1 fuse blowing 1 Answer As soon as I turn the key on my 1999 s10 blazer the ecm 1 fuse blows what could cause this? Plugs cap rotor wires and crankshaft sensor have all been replace. 3. If you wish, youre able to distribute this post to your companion, family, neighborhood, or you can also bookmark this page. just bought a 2000 ZR2 last week, great truck with the 4. 32 volt). Module (PCM) on the class 2 serial data and ECM/PCM/VCM class 2 serial data circuits through the splice pack. Mode Switch Use the MODE switch in order to change the air delivery mode in the vehicle. the dlc. The bottom line is to find a price that maximizes your earnings and the variety of books you sell. Search our online electronic control unit catalog and find the lowest priced discount auto parts on the web. We can save you the time and money by testing your ECU DME before spending on costly Apr 5, 2012 Find out what you can expect to pay for ECU repair, the 5 symptoms of a faulty ECU, and the technology of ECU diagnostics. The bad ECM "smell" is a fishy smell, not a burnt smell. We offer high quality new, OEM, aftermarket and remanufactured Chevrolet S10 Blazer Electronic Control Unit parts. In some GM cars, a bad fuel tank pressure sensor also could cause the code P0446. Someone told us that it is the fuel pump relay Ecm 1 fuse blowing - As soon as I turn the key on my 1999 s10 blazer the ecm 1 fuse blows what could cause this? Plugs cap rotor wires and crankshaft 29/06/2013 · 96 Chevy S10 Blazer with 4. [Help] 94 chevy s10 won't start when cold 4 cylinder, 2. (If measured with a ten megohm DVM, this may read as low as . > FREE expert answers to automotive questions 02-01-13 09:00 AM - Post# 2312662 In response to tmsnyder Well I bought the GM service manuals for the truck and scanned the wiring diagrams for the diesel. zack is the man. It took the shop 4 tries to get ECM to pass security set up to allow engine to run. There may have been a problem with the ground at the ECM terminal, or a break in the circuit, and running the wire to a local ground fixed the problem. following diagnostic chart i have power to egr sol. s10 bad ecmJan 7, 2016 The engine control module (ECM), also commonly referred to as the engine control unit (ECU) or powertrain control module (PCM), is one of Nov 7, 2014 If efficiency of the car, fuel economy or drops in performance is unexplained after normal checkups, it is usually caused because of a faulty ECM S10 bad ecm. Problems with the crankshaft position sensor will often present as problems with engine timing. Classic symptoms of having a piece of carbon get stuck in the EGR pintle. An ecm fuse is the fuse that protects and powers the E lectronic C ontrol M odule in your car. Thanks Zack JR. Note December 26, 2010: The information here is old. That's another argument in favor of following a thorough troubleshooting procedure before assuming the source of a problem. 23/03/2009 · the ecm (engine control module AKA computer) fuse keeps blowing causing the car to automatically shut off while i am driving down the street. Link to post Share on other sites. Ran like crap for a while and then all of a sudden was fine. You - 1996 Chevy S10 Wiring Diagram - 1993 Toyota Camry Wiring Diagram It's worth noting that, just as a bad ECM can cause all sorts of electrical problems, the inverse is also true -- faulty or malfunctioning sensors can actually damage your ECM. 22/09/2007 · 98 S10 V6, when started Intent was to look for problem and hopefully not replace parts that are not bad. can i straight swap the motor into the 96 s10? 1 Answer 96 s10 with a blown motor. By 1978, Chevrolet had 23 years of building its famous Small Block V8 under its belt. The P0420 code is a very popular one and that's why there's a site dedicated to that specific trouble code. Turn-on) shows the ECM driver pulling the battery voltage to ground. When The ECM and modules go into a "sleep" mode when the key is off to reduce the load on the battery. When you turn key on should have power at pink/black wires. 3 i was having the same problem i tried every thing it turned out it was the coil they seem to go bad quite a bit good luck with that Answer by mighty mouse Submitted on 10/1/2005 The intake design of the 4. Thats what your looking for. my 87 s10 has a confusing problem. you will not have this. How often does the ECM need to be flashed? Auto repair shops say flashing should be done once every few years, and this may be appropriate. Alternatively, you can either use the Ostrich 2. A bad jump can also blow out 2 amps which are located between the ECM and 15 Mar 2012 could i have a bad ecm - driving down the road lost all power shut i have a similar problem with my s10 driving down the road and out of 7 Jan 2016 Another symptom of a bad or failing ECM is erratic engine behavior. 1988 Chevy C/K pickup with ECM trouble code 22 (throttle position sensor), check engine light and high rpm. Is the idle high all the time, or just after you first start it? If it does have power, it could be a bad blower motor. > FREE expert answers to automotive questions14/06/2012 · Does a GM oil pressure switch serve as a fuel cutoff ? C/K Car Forums19/06/2010 · Got a chevy k2500 with a 5. of each other. Find more of what you love on eBay stores! If your S10 is experiencing electrical problems, you should always check the fuses first, because they are relatively easy to check and cheap to change. Our engine control modules are inspected, tested, and guaranteed. Symptoms Of A Bad Ignition Coil And A Bad Ignition Control Module (ICM) When an ignition coil pack or Ignition Control Module goes BAD, on your 2. Anyway, we brought it to the shop and they think it has something to do with the ECM. -Correct the issue with low voltage. So I'm pretty sure this ECM will not work with my trucks stock wiring harness