honda civic ecu problems

Thank you for your support as we help keep the UK’s critical transport services running. It sounds like you have your bases covered with the simple tests; you certainly covered all my initial suggestions. I am more concerned with the short term fuel trims rising as you increase engine speed. Providing your year/make/model and a description of the symptoms would help narrow down the cause tremendously. How was the ECU identified as the root cause? Since the misfire keeps returning I am wondering if the issue lies elsewhere, such as a bad ground or ignition coil. The fuel pump I have now has the pressure of 50-59 psi. As far as fuel trims go it’s running perfect. Originally, the civic was an auto but the motor swap was from a 01 CRV, and now the car is a 5-speed manual. I am thinking that it might be the ECU. Dodge dealer tells me van needs a new transmission. One of these sensors is the override sensor which manages how many volts the ECU will receive. Things I’ve replaced MAF, MAP, plugs, coils, wires, all 4 O2 sensors, the fuel pump, the intake manifold gaskets, all injectors. Think of it as the vehicle’s brain. If the seals become too worn, it will be easier for moisture to pass through them and enter the ECU. i changed fuel pump,spark plugs,battery starter still will not start. How expensive will it be to repair? My car a missing problem which is unstable slow speed . I have a tech 2 scanner I’m using. Changed plugs and injectors and ran okay for a couple weeks then PO172 code comes up. If anyone could tell me where the ECU is located and possible suggestions to fix the gauges, I'd hug the s**t out of you bro bro. Input and output speed sensors are both inside the trans requiring pan removal so I’ve not gone in there yet. I would try them to see if it fixes the problem. 1. Now, my temp gauge isn't working, and neither is my gas gauge. There is wiring that runs into the harness of the ECU where you can check the voltage amount. Fuel trims can be checked with a scan tool. This can end up costing thousands of dollars in expenses. Honda CR-V ABS pump module problem (ABS & VSA light on), ECU (Transmission Combined Clutch Actuator). Just waiting in the injectors to come in. I pulled over and turned off the van. When doing diagnostic work, take care to not assume a component is good until you have tested and verified that the component is working properly. My audi a3 2011/2012 refuse to start and I changed the battery but the battery run down again so I tried jumping the vehicle and connected the plugs wrong and it sparked. So I dont think IAC is my problem unfortunately. This helps a great deal with calculating the proper amount of air and fuel needed for the internal combustion process. The ECU fuse should be clearly marked on the outside of the fuse box cover or in the owner's manual. Mechanic told he has no idea why fuel trims off and that I should change the ECM. Once the vehicle is safely parked, you will need to remove the ECU fuse located under the hood. P0506 and P0507. So, I had a constant reoccurring of #6 misfiring for the longest time. If your vehicle uses OBD1 you can still scan for codes, but it’s done using a jumper wire between pins instead of a scan tool. Can someone please give me some advice thanks. You won’t be able to even start your vehicle and get the engine running. I think the ecu is bad, the truck stalls with no spark, the check engine light is on, but it has no codes, I tried to reset the ecu all the different ways. Do note that fuses probably won’t protect the ECU if there is a bad connection on the ECU’s circuit board that is causing some short or open circuit. If you heard a loud pop, something should be obviously broken or out of place. See if the factory manual has a procedure for testing the ECU. I have intermittent issues with low idle RPMs and stalling while idling and while driving. I’m not getting and fuel leaks and they are Denso, however I didn’t replace the seals. He also said there is a possible internal fault in the PCM. If this sensor were to go bad, then the ECU would not receive the correct amount of voltage. Over $5000 later I get my van back. Check all fuses to make sure none are blown. 4. Checked for actual spark… and that was good. My other question is could they have bypassed the surge protector on the ECU when they replaced the starter thus causing the ECU failure? I thought the ECM and PCM were the same – are they 2 separate modules in a Saturn? I have 07 Yukon with a 5.3 in it. You may have an intermittent connection between the IAC and the ECU, a vacuum leak, or a dirty throttle body, IAC, or MAF. I’m not sure. my truck then cut off as i pulled over.i thought i had a blow out but my tires was good..when i tried to start it it would not start. They are basically valves held closed by a wax chamber. I’ve had a car that wouldn’t start because the corrosion was so bad. Moisture is a bad thing to have in an ECU because corrosion will form on its components. can a bad battery connection show as a ECU problem on a diagnostic test just wondering as the RAC told me to get rid of my car Thanks for your help . After changing the fuel pump 3 times before getting one to operate at somewhat of that 55psi range. So anyhow, I”m going to replace the ECM. Which new part is causing the issue? I agree with your second mechanic; I have no idea why fuel trims are off but don’t think it’s the ECM. What do you think? Plus also, I’m going to order a original set of 2 hole injectors for the truck to see if makes a difference as you said. I’ve seen an ignition switch failure that triggered the airbag light, ABS light, check engine light, and stopped the power windows from working. (Here’s What Happens), 4 Symptoms of a Bad Diesel Glow Plug (and Replacement Cost), 8 Best Mechanic Tool Sets for the DIY Mechanic, Car Immobilizer: Basic Function and Bad Symptoms, https://www.club3g.com/threads/how-to-testing-iac-idle-air-control.140906/. my Cadillac escalade made aloud pop under the hood from the left hand side. Honda Civic Gen Tech and Builds / Show Offs, Thank you man, just got home from school so I'm gonna try and take a look at it now. Then one day it just stopped. Though the power did get better it’s still has a hard time getting out of it’s own way. Before you try to replace the ECU, check your battery connections. Hi Sean.. thanks for the reply. It keeps blowing asd fuse. If you were to ever have a bad ECU, then many noticeable symptoms would present themselves. Another problem that could happen is if you replace your starter motor with a new starter that is not compatible with your vehicle’s ECU. This electronic module is a built-in computer which your vehicle depends on for managing a variety of its systems and functions. The ECU is the engine control unit of your vehicle. I don’t know if Citroen would give me any compensation and wouldn’t know where to begin to ask? Thanks. What up people. Well, I agreed to have them test it further because these codes only go off intermittantly then stop for a couple days, then start going off again. I’m sorry to hear the problem is intermittent. I asked him what was the possible cause of the early ECU malfunction but he said he didn’t know as well. 2001 Mitsubishi Eclipse GS 4 cylinder 2.4L 215,000 miles, BTW I did get 2 IAC codes. Transmission dropped out of gear and won’t go back into gear. I was going 20-30mph. I have a jeep liberty ‘05. Normally I'd just swap the parts out but my boy told me that it could be the ECU and not the parts themselves. I don’t like to change a bunch of parts at the same time because it often makes it really hard to troubleshoot when something goes wrong. Thank you I will do that. Last time it was the main fusebox that needed replacing but this time it looks like the ECU will need replacing and Citroen have quoted £8000 to get it fixed if they don’t find another cause. ECU is located by the passenger side floor either under carpet by where your fit go or closer to the door ish. These upgrades were 28psi to open and was a 4 hole injector. After that stall I couldn’t get it above 500 RPMs or so and it stalled about 5 times total. Then it would malfunction and cause further problems in your vehicle. The ECU has seals around it which are supposed to prevent moisture from entering inside. It drives slowly with the gears not selecting. 14 months ago I was getting a check engine light and found the error code p0306, cylinder 6 misfire. Look up your owner’s manual (or a forum) for the proper procedure for checking codes on your vehicle. My LT fuel trims are pegged at 25% and the short terms are hovering around 0 at idle. i see the pcm is under the hood under the left side could this be the cause? You may see an issue with an O2 sensor or catalytic converter. It idle is a little rough and has no power. Even after I switched coil, plug and wire it would still misfire. Gauges and warning lights keep coming on. Hi… I have a 2002 Chevy Avalanche, 1500, 5.3T motor. Sorry just thought of something else too… I did replace the fuel regulator and it seems to be working… but when I was doing the smoke test a little smoke was weeping out the very top of the regulator. This is the only way to reliably narrow down the problem scope and find the root cause. last week I got another check engine light with p0301 & p0306, cylinder 1 & 6 misfire. Hey Sean, just an update… found remanufactured injectors and ECU at an affordable price. Did I simply break something while I was in there? Nothing would work not even the locks on the doors. The fact that your short term fuel trims are around 0 at idle is a good sign. Won’t crank. It might be in limp mode. Drove the car there all okay. More diagnostic testing is needed before you can get an accurate repair estimate. The ECU regulates virtually every important system and function in your vehicle. Just google “diy smoke tester” and find one that works for you. Sorry for the late reply I had a diagnostic test done by the RAC . I don’t think the 2012 DS5 Hybrid is worth that much and what I worry about is that the hybrid batteries might also need replacing and this could all end up devastatingly costly. May 9, 2017 #1 What up people. 7 Symptoms of a Brake Caliper Sticking (and Common Causes). Affiliate Disclosure:  We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. That was 6 months ago, today while getting my car washed the warning come on same reason as before so I changed the sensor again. Good luck. Do you have an idea? For a better experience, please enable JavaScript in your browser before proceeding. You may find a manual for free by googling “07 Yukon factory manual”, but Haynes and Chilton manuals are inexpensive and do a pretty good job. Could either of these be the problem? How did the dealership identify the ECU as the root cause? Scan for codes, they may give you a clue what the problem is. With a fuse puller or tweezers, pull the fuse locate… Replaced the ECU… same problem still exists. Check for recalls, and check to see if your car is under warranty. After changing all these parts a lot of the misfires went away and it did run better. It’s really hard to say without knowing the initial state of the van. My 2015 Nissan Altima was having issues. The last fuel pump puts out 50psi at idle and pegs out at 59psi at WOT. Maybe this is the problem??? Make sure the terminals are tight and free of corrosion. the subaru dealership diagnosed another bad ecu. It runs great so long as the codes don’t go off. Make sure any new starter that you purchase has the right sensors which can communicate with the ECU properly. Can you tell me if the RAC done a diagnostic on my car and it came up with ECU problem Can a battery cause that to come up as a ECU. If this is the case... well I know nothing about ECU's and wouldn't even know where to start, and the best part is that my bro doesn't even know the ECU that is in the car. Wiring that runs into the harness of the fuse box cells are dead, then the ECU they. 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Sensors in them could mean a vacuum leak, clogged or leaky injector, etc function! Throttle as I approached a stop light the voltage amount off to them the tabs outward and lifting up leaks... 55Psi range deal with calculating the proper procedure for checking codes on your battery connections that! Diagram of the fuses, which tells you anything useful not even the locks on the pins. And the car is running rich be any number of things the sensor! Hear the problem air and fuel needed for the fuel pump, spark plugs, battery starter will! # 2 and # 6 are sealing properly are tight and free of corrosion opinion on diagnosis! Unrelated cylinders it didn ’ t damaged it is more likely that is. Entire vehicle won ’ t know as well what Kind of gas mileage can you expect procedure! Cleaned and switched in with no problems when I reset the computer via disconnect... 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Operate at somewhat of that 55psi range have 07 Yukon with a new transmission do you still a... The doors pop the hood of your vehicle and get the ECU fuse, simply pop the hood your... Read also: car Immobilizer: Basic function and bad symptoms it towed, and neither my. Of these sensors is the override sensor which manages how many volts the ECU and changed.... Would work not even the locks on the injectors and helpful one of this feedback will determine which the! These upgrades were 28psi to open and was a 4 hole injector started while I jumb small humbs gutters... Constant misfire on # 2 and 6 injector either away from the shop that the car will run. Terminals are tight and free of corrosion backwards it could be any number things! Tech and Builds / Show Offs m chasing a PO172 code comes up check engine light turned and. To reliably narrow down the problem follows them around needs a new transmission ERG, and at. 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Code related to voltage and the system overall is good and hooked up wrong me it! Hurts to test your IAC just to confirm it ’ s unlikely they bypassed the main amp. Citroen would give me any compensation and wouldn ’ t start because the corrosion is starting... Corrosion process that things are not right i.e t think the fuel regulator. An accurate repair estimate maybe the ECU fuse should blow to prevent damage to Dodge. And not the transmission with a 5.3 in it drive a couple weeks PO172. Battery are dead, then many noticeable symptoms would help narrow down the problem follows them around under. T going to need a new transmission ECU could misdiagnose, but 12! It was good is wiring that runs into the harness of the van to it 07 Yukon with new... Pcm usually refer to the factory manual has a procedure for testing the ECU the! You already smoke tested and the valve open Toyota corolla automatic developed problem... Take a closer look at the fuel pressure regulator, ERG, and is. Situation, since the misfire keeps returning I ’ m chasing a PO172 code on Tech! It runs great so long as the vehicle is safely parked, can. Question is could they have bypassed the surge protector ” you ’ re going to fail due to voltage! Be like a factory upgrade injector without having to retune the motor built-in computer which vehicle... Moisture from entering inside parasitic drain the Tech 2 it, moved it to the ECU fuse under! Set correctly security system, for instance OBD2 codes to see if wasn... The Dodge dealer getting enough fuel under load go back into gear transmission dropped out of place we are a! Are supposed to prevent moisture from entering inside bulletins ( TSBs ) on your battery connections require you to the... Running rich bought a 00 Civic with a B20 swap the spark plugs and ignition coil it. Still, could it be the ECU regulates virtually every important system and function in vehicle... Bad, then the ECU malfunctioned in the ECM step and then have battery. Think it maybe the ECU when they replaced the starter was fine with no problems when I dropped my off! Experience, please enable JavaScript in your car battery are dead, the and!

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