If an overheating issue is left unchecked, it can cause a more serious problem such as blown head gaskets (assuming that’s not the root cause). You can check for vacuum leaks using a smoke test. If you were to ever have a bad ECU, then many noticeable symptoms would present themselves. All you need to do is connect a voltmeter gauge to it. They denied they washed the engine and the owner later said he did it himself with vapor. Make sure any new starter that you purchase has the right sensors which can communicate with the ECU properly. High fuel consumption and black smoke could be an indicator that the car is running rich. It wouldn’t take you long to realize the ECU was responsible. Since the misfire keeps returning I’m wondering if the issue lies elsewhere. I am on the correct pins and following the instructions to the “t”. Called the AA & they said the thermostat sensor needed replacing. I recently bought a 00 civic with a B20 swap. Since you already smoke tested and verified you have no leaks, I would take a closer look at the fuel system. You might consider pulling the injectors and either have them cleaned or tested to make sure they aren’t clogged, but since the misfires were across multiple cylinders I am more inclined to believe it is an issue with the fuel pressure regulator or fuel rail on bank 1. last week I got another check engine light with p0301 & p0306, cylinder 1 & 6 misfire. 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. I found this “4.8L, 5.3L, 6.0L or 8.1L your fuel pressure should be 55 – 62 psi with the key on – engine off”. The engine light won’t shut off. Checked the back pressure of the one cat and it was good. I have them replace the transmission with a brand new one. 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. If I were in your situation, I would start my troubleshooting at the very basics, assuming I had no info about the problem at all. Then hours or days later I’ll start it up and have it only at 600 RPMs again and wanting to stall when I put it into geae. If it’s newer than 1995 you can scan for OBD2 codes to see if that tells you anything useful. swapped components and checked it again and now the misfires were on two other unrelated cylinders. They then call me and tell me that my starter was now making a loud noise so that would need to be replaced as well. Think of it as the vehicle’s brain. ECU is located by the passenger side floor either under carpet by where your fit go or closer to the door ish. It’s a huge worry! So, I had a constant reoccurring of #6 misfiring for the longest time. The starter was fine with no problems when I dropped my van off to them. Once the thermostat cools back down below its designated temperature, the wax solidifies and the valve closes again via a return spring. You were right in steering away from the ECU. I’m driving my van when all of a sudden the battery light came on. Won’t crank. Smoke Tested also… found no leaks. If the corrosion is not cleaned away quickly, it will cause these components to get damaged. Think of it as the vehicle’s brain. Then all of a sudden the #6 misfire went away as 2 other misfires appeared. The average ECU is expected to have at least 9 volts, but preferably 12 volts. I’ve had a car that wouldn’t start because the corrosion was so bad. Then you will have a malfunctioning ECU. Hi I have a Citroen c4 hatchback 2010 I have an intermittent problem . Gauges and warning lights keep coming on. What do you think? In your professional opinion is this sufficient enough? I change the cylenderhead gasket and oil seals due to leak but when i install all the parts and wirings and start the engine the engine only works in seconds and stop. Nothing would work not even the locks on the doors. There monitor say everything is within range, but when I do the multimeter test from the manual I’m not getting the same values actually way out of range. Check all fuses to make sure none are blown. So anyhow, I”m going to replace the ECM. Browse the Outback forums for people who had the same issue. Checked for actual spark… and that was good. Though the power did get better it’s still has a hard time getting out of it’s own way. Had it tested and the system overall is good but a command from the ECU is disallowing the compressor to engage. It started while I let my foot off the throttle as I approached a stop light. They tried to jump start it (don’t know if smth stupid happened there, incorrect connections) and when I went there I air-sprayed at ECM cables and drops of water came out. 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. Mechanic told he has no idea why fuel trims off and that I should change the ECM. It’s possible the ECU could misdiagnose, but it’s highly unlikely. 2. The ECU is the engine control unit of your vehicle. At that mileage, if it wasn’t damaged it is probably a manufacturing defect that should be covered under warranty. are there other common causes to ecu failure?? It idle is a little rough and has no power. Check the simple stuff first – make sure the battery is good and hooked up properly. 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. My 2015 Nissan Altima was having issues. 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. I asked him what was the possible cause of the early ECU malfunction but he said he didn’t know as well. Which new part is causing the issue? It sounds like you have your bases covered with the simple tests; you certainly covered all my initial suggestions. 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 . Did I simply break something while I was in there? 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. 14 months ago I was getting a check engine light and found the error code p0306, cylinder 6 misfire. Wondering if maybe you could explain why when I test a specific sensor on my ECM(ECU) for my 2010 Subaru Forester I am not getting the same results as the dealerships Special Scan Monitor. 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. Replaced the ECU… same problem still exists. Through a numerous array of electronic sensors, chips, and components within the vehicle, the ECU can transmit data feedback to the engine. If any of the cells in your car battery are dead, then your ECU is going to fail soon afterward. It keeps blowing asd fuse. I have intermittent issues with low idle RPMs and stalling while idling and while driving. I agree with your second mechanic; I have no idea why fuel trims are off but don’t think it’s the ECM. Hi Sean… I’ve been looking around the internet and came across the fuel pressure specs. Can someone please give me some advice thanks. Garage now says I now need a new ECU, battery and alternator. Scan for codes, they may give you a clue what the problem is. In either case, Citroen may be of help. Then I changed some fuel lines, fuel filter and the injectors. If you heard a loud pop, something should be obviously broken or out of place. 09 VW CC. I don’t really know what I should do; Cut my losses and run or go the whole pricey hog and get it fixed, if that is actually possible. I know very little about the swap that's what's causing the most problems, but I'm gonna start dig into the internals, fluids, tranny, and so on over the next few days to get her up and running perfectly. Check to make sure your multimeter is set correctly. Many vehicles have starters with their own sensors in them. There are lots of internal causes which could contribute toward this. I recently bought a 00 civic with a B20 swap. Most thermostats are mechanical devices, not really sensors. Strong compensation one way or the other could mean a vacuum leak, clogged or leaky injector, etc. This device will be able to detect how much voltage is running through the ECU. Could it be the ECU? I’ve seen an ignition switch failure that triggered the airbag light, ABS light, check engine light, and stopped the power windows from working. When I start giving it the gas the short terms go up and the long terms go down but the average together is around 25%. I would get a second opinion on that diagnosis. the subaru dealership diagnosed another bad ecu. I have a 2019 Hyundai Kona with less than 10k mileage. This Honda Jazz engine management ECU will commonly cause a constant engine misfire, engine management warning light and stored fault codes for injector circuit malfunctions... Failure of the Honda Civic i-Shift clutch actuator will prevent gear selection and even prevent the vehicle from starting, commonly storing fault code P0810 - Clutch Position Problem. The Subaru community is a very active and helpful one. Is a new part defective, incompatible, or hooked up wrong? The engine and drivetrain are the most dependent on the ECU. Once the vehicle is safely parked, you will need to remove the ECU fuse located under the hood. Thank you for your help . Moisture is a bad thing to have in an ECU because corrosion will form on its components. I’d poke around a bit more, then check for the presence of fuel and spark when you crank it. It’d probably be best to take it to a shop. We changed the battery and alternator same problems exists. If you hooked up the jumper cables backwards it could be any number of things. But, now I have what seems to be a constant misfire on #2 and 6. Glad to hear the injectors worked! Make sure the terminals are tight and free of corrosion. The ECU is the engine control unit of your vehicle. Didn’t check the other cat though. I found a good source for your car that may help: https://www.club3g.com/threads/how-to-testing-iac-idle-air-control.140906/, Hi I was driving my when the temperature idle went to the limit & the warning was engine too hot. This will require you to get the ECU repaired or possibly even replaced. This site uses cookies to offer you a better browsing experience, by continuing to browse you agree to the use of cookies - find out more/change settings ECU acting up do you think? Are these ECU symptoms? I am thinking that it might be the ECU. Maybe this is the problem??? This electronic module is a built-in computer which your vehicle depends on for managing a variety of its systems and functions. See if the factory manual has a procedure for testing the ECU. My Toyota sienna 2001xle show security indicator light on dashboard refuse off and is not starting. Then one day it just stopped. 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. You must log in or register to reply here. For a better experience, please enable JavaScript in your browser before proceeding. However, I think it is more likely that there is a parasitic drain. I was going 20-30mph. Fast forward just 6 weeks. You won’t be able to even start your vehicle and get the engine running. Hi Sean… the new fuel injectors worked for the fuel trims. That’s very strange. My 2010 Toyota Corolla has a misfire in cylinder one.I have got new coils and my injectors are good.I have checked for a head gasket that is also good to.What could it be.The motor is a 1.8.
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