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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 7:07am On Apr 04, 2017 |
2001 HONDA CIVIC P0730 |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 7:07am On Apr 04, 2017 |
2001 HONDA CIVIC P1457 |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by rebella(f): 10:11am On Apr 04, 2017 |
AutoElectNG:Hi AutoElectNG, any feedback please |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by MPVGoddess: 11:40am On Apr 04, 2017 |
AutoElectNG: |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 12:09pm On Apr 04, 2017 |
olaboy1: After reviewing your case, it is clear that since it took longer than expected to resolve, we forgot the bolded otherwise we would have postponed the emission test. Hope you have seen the instructions for resolving the bolded, please provide feedback when done! Apparently apart from that there are no other problems in the emission test report! |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by laserjet: 12:23pm On Apr 04, 2017 |
AutoElectNG: Yes...thats me kindly help decode these error codes and how to fix. thanks |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 4:53pm On Apr 04, 2017 |
AutoElectNG: I like your analysis on solving high HC and CO at idle. I have decided to give the car a comprehensive servicing first, actually it's something I do when I buy a used car but for some reason I just took the words of the previous owner as golden...will never make that mistake next time. As for the comprehensive service I bought all from Toyota company direct brand new to avoid incompatible after market parts or wrong part numbers. I have changed air filter. Mine uses 17801-0D011, the car had LX 1286 I have changed spark plugs, and in the process I noticed one of the wire harnesses of plug no2 was sitting tightly under the plug cap of no3, so maybe the wire has been compromised or ripped off. I couldn't tell as the wires were secured by a a wrap and I didn't want to tear open the wrap to see the conditions of the wires inside....either way I am going to carry out thorough inspection of the plug wires. FSM recommended just two plug numbers and what I found in the car was the right make of plug but different part number (NGK IFR6T11) FSM says Denso SK20R11 or NGK IFR6A11 I am changing oil and oil filter, fuel filter, PCV valve because when I took out air filter box, the other extension was very oily inside which leaves me to believe that the PCV is not doing a good job of sucking off the oil or taking off the pressurized oil from the crankcase and recycling it through the right channel into the combustion chamber, but rather due to the pressure at the crankcase it is sending OIL back the same breather hose it should be getting AIR from which is the hose connected to the air filter box. And I think it's better to replace inexpensive parts for a car this mileage. I will have my mechanic also take out the AGR/EGR valve for proper cleaning as this and PCV valve are known to cause high emissions and fail emission test. Lastly I have also ordered for OEM thermostat and I will flush out all the engine coolant and replace with fresh anti freeze engine coolant with a new thermostat. I am doing this because the car had too little engine coolant before and I don't know if the engine coolant was ever changed, and when I drove around for like 25 mins monitoring my engine coolant temperature it was just showing 70* celcius and my FSM says it needs to be 80-95 when it's warmed. However once I'm parked and leave the engine running then it starts going up gradually up to 85, so I'm not satisfied that my engine coolant on motion is reading lower than specified and I believe 80km/h for 20mins should be enough to get the car properly warmed up. Once I'm done with this service I will get back to you on STFT and LTFT. I did not change air filter, engine oil and oil filter before my emission test, and I did not drive it for 1hr before the test, the guy at the center drove it for like 35 minutes or so. I don't think my MAF is bad because after cleaning it, the grams on my OBD live data changed immediately from 2.96grams to 3.65grams. I know this analogy may sound funny but it's the truth. I have a Bosch coffee maker the one you use tablets for, and at some point it got clogged and no water would come out. I took out all the parts and cleaned off all the debris and it's working like brand new again. So I'm thinking if this car hasn't worked properly and combusted fine due to oxygen sensor problems then most likely we may have carbon build up and getting out those carbons would make a big difference, but ironically when I pulled out the old plugs from the car, they had no carbon at all, more like the threaded parts little wet with fuel and not oil and just inactive. Isn't there a way to decarbonise a car completely without taking parts out. From my OBD live data my timing advance is at 10 degrees and FSM says ignition timing of cylinder 1 should be between 5-15 degrees, so can we rule out ignition timing issue, but I don't know about timing chain (crankshaft and camshaft timing) or are they same thing. I will also find a way to do the smoke test for vacuum leak, what do you recommend since I don't have any propane machine. My STFT and LTFT for bank 1 are in the single digit of + or - 9, while my STFT and LTFT for bank 2 are in the double digits of + or - 14. I am trying to find EGR system in the FSM PDF files. I need info on EGR vacuum solenoid, VSV and the modulator, just to be 100% sure my EGR system functions properly. |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 5:58pm On Apr 04, 2017 |
Kindly help me analyze the data of my sensor from my OBD wifi live readings. See pixs attached
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 6:02pm On Apr 04, 2017 |
Pay attention to what the ECU 1 says about present oxygen sensors.
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 6:10pm On Apr 04, 2017 |
This next pix showing all the 4 sensors voltage readings from the OBD wifi live data. Are the sensors installed properly and is the OBD wifi reporting correctly the sensor positions. from the pixs what volt should the upstream sensors have and also downstream sensors. From the previous post showing two sensors NOT USED, the measurements are in % and not voltage, I am getting even more confused. I just wanted to make sure the sensor side is perfect and I guess if it wasn't ECU should have set some DTC's I guess.
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 5:49am On Apr 05, 2017 |
I got the answer for the NOT USED seen in those pixs. The scanners are designed to disregard the PIDs of the downstream sensors as they are not responsible for fuel trims. So I'm covered all my sensors are intact and working good. |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 7:58am On Apr 05, 2017 |
olaboy1: This might help http://auto.howstuffworks.com/ignition-system.htm and this video https://www.youtube.com/watch?v=arWoIjk6seA |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 8:26am On Apr 05, 2017 |
2001 HONDA CIVIC FINAL COMMENTS |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by J0hnTrevolt(m): 11:10am On Apr 05, 2017 |
How one person go jus dominate a public thread beats me |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 4:15pm On Apr 05, 2017 |
I did the spark test on the ignition coils and only thing I heard was spark or tapping sound and I couldn't see with my naked eyes any sparks on the 4 coils. How I performed the test. I unplugged the ignition coil but still connected to the wire harness and put a spark plug in it and then I started the engine. At first I saw spark coming out on the first coil but the spark was not coming from the tip of the plug rather from the side, then other attempts no spark anywhere just the tapping of spark sound. More like you can hear but you can't see. The ignition coil are so expensive so how do I make sure 100% the fault is from the coils and not the wire harnesses or voltage source to the coils, what other things do I need to troubleshoot for in a complete ignition system before I condemn all my ignition coils. As for MAF sensor I had 2.5grams from the beginning and after cleaning it I had 3.5grams, and then after changing my air filter I have 4. Something grams now.
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 4:48pm On Apr 05, 2017 |
rebella: Please your Honda Civic is for which market? So I can determine which Factory Service Manual to follow in fixing your issue! That is holding me back now! Plus of course time to spare from other commitments |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by rebella(f): 8:21pm On Apr 05, 2017 |
AutoElectNG:It's Japanese, thanks a lot, I really appreciate your help |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 10:37pm On Apr 05, 2017 |
J0hnTrevolt: The codes have been explained. The fix will be posted tomorrow. Juggling several tasks and trying our best to please you as well! |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 10:41pm On Apr 05, 2017 |
rebella: Has any work been done on the fuel tank? Or around it? If yes, what work. Has the rear passenger seat been taken off before? Have you ever replaced the fuel pump on this vehicle? |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 5:05am On Apr 06, 2017 |
I believe my MAF sensor is partly or wholly responsible for the car's poor performance. Before first cleaning I had -21.9 in STFT, after first cleaning it came down to -8, second cleaning around -0.78 to -3. The first time I cleaned it I didn't realize there was a second filament inside, I was too careful because of some videos I saw of a guy cleaning it with so much care. As a matter of fact I only sprayed it with cleaner and never scrub it. Second cleaning I sprayed the other newly discovered filament inside and STFT became better. So I have seen a YouTube video on the proper way to clean it with disc brake cleaner, and I'm positive this cleaning would bring down both STFT and LTFT. My question is if my STFT and LTFT are in the range of +/-3, does this mean my car is healthy and I will no longer experience any drivability issues and less gasoline consumption and finally pass the almighty emission test? What exactly should I be concerned about from the following components MAF sensor MAP sensor IAC IAT They all seem to be controlling air. |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 7:42am On Apr 06, 2017 |
olaboy1: The most important factor or subsystem is the MAF sensor, see these videos https://www.youtube.com/watch?v=Z3QuuEPef4k https://www.youtube.com/watch?v=4iWH4zyV5u4 Does your vehicle use a MAP sensor? We think not! Does your IAC valve have a problem? We think not! And we believe that m_05_0086 agrees with us! Does your IAT have a problem? Well see m_05_0064 to understand how it functions. We don't think so Having replaced the air filter and cleaned the MAF, please report the STFT and LTFT using the format earlier provided to you! We have seen all your posts - as will respond as time permits.
Your STFT and LTFT should be less than 10! Let me quote aa1car for you: What Fuel Trim Values Should Be Ideally, the STFT and LTFT should be within a few percentage points of zero when the engine is idling or being held at a steady RPM. Remember, STFT can bounce around quite a bit as when you suddenly snap open the throttle or decelerate. But LTFT can tell you if the average fuel/mixture is running rich or lean. Good LTFT values should be as close to zero as possible, though they can range from 5 to 8 percent depending on the condition of the engine. If the LTFT is getting up around 10 percent or higher, it usually indicates a problem that needs to be diagnosed. Source: http://www.aa1car.com/library/what_is_fuel_trim.htm |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 3:42pm On Apr 06, 2017 |
I have done the final cleaning and at this rate no more cleaning of MAF sensor. The OBD2 data below for the fuel trims. BANK 1 STFT @ IDLE (740RPM) +3.12 ---> -2.34// BANK 1 LTFT @ IDLE (740RPM) +7.03 BANK 1 STFT @ (1500RPM) +3.91 ---> -2.34// BANK 1 LTFT @ (1500RPM) -1.56 BANK 1 STFT @ (2500RPM) -3.91 -----> -8.59 // BANK 1 LTFT @ (2500RPM) -1.56 ================================= BANK 2 STFT @ IDLE (740RPM) +3.12 ------> -1.56 // BANK 2 LTFT @ IDLE (740RPM) -1.56 BANK 2 STFT @ (1500RPM) +3.12 -----> 0 // BANK 2 LTFT @ (1500RPM) -4.69 BANK 2 STFT @ (2500RPM) -3.91 -------> -9.38 // BANK 2 LTFT @ (2500RPM) -4.69 Anytime my radiator fans kick in my STFT and LTFT drop to the close to zero you wrote up there. By the way my valve cover gasket is leaking oil, could that also be responsible for loss of engine fire power |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 5:38pm On Apr 06, 2017 |
Also I have oil leakages on my valve cover gasket. I cant see the other side where you have the manifold, it's so tight to see clearly. Can this cause loss of engine fire power. Do I really need a new gasket
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Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by rebella(f): 11:25am On Apr 07, 2017 |
AutoElectNG:I have changed the fuel pump, rear passenger seat has been taken off. |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by J0hnTrevolt(m): 8:03pm On Apr 07, 2017 |
AutoElectNG: |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by J0hnTrevolt(m): 8:04pm On Apr 07, 2017 |
This Olaboy1 is so so annoying on this thread. Psffff |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by AutoElectNG: 1:33am On Apr 08, 2017 |
J0hnTrevolt: Chasing Dollars You know the economy is not far to those earning Naira But I will see how to sort you out this weekend. I could easily write a one-liner but I will consult the factory service manual, I will consult third party fix databases, is this problem common to this vehicle, what do mechanics around the world have to say about those codes as they relate to your vehicle, what else should you be aware of, are there updated part numbers, are there any applicable technical service bulletins, boy you are getting for free what people pay top dollar for, so be patient with me.... And stop hating on my first nairaland client... you should try to be like him instead! |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 10:06am On Apr 08, 2017 |
J0hnTrevolt:John no need to take this personal, when OP started this thread I was the only one here for some time until others joined, and by no means am I taking over the entire thread. Go back and read Tunde's post on his Lexus jeep and you would see I am also concerned about everyone here. Just like a good student I've thoroughly explained my car's problems the same way my teacher AutoElectNG has been very thorough in his reply considering this diagnosis is done online. I believe in him so much and exactly what he says would most probably be 95% of the fix, I imagine if this gentleman has physical access to your car, it would probably be fixed within 1hr. So please be patient with him, for now I will let him respond to you more. Pls give more information about your car's problem to him. |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by dandollar1: 8:20am On Apr 11, 2017 |
Hello bro, I have been having these codes in my Honda Accord 2007 model that uses a drive by wire system for up to a year now: P0123 P0223 P2101 P2176 The codes have been coming on from time to time, sometimes in a space of one week, sometimes in a space of one month(as the spirit leads). Each time it comes up, idle becomes erratic,the engine revs on its own without touching the accelerator pedal, very high idle, and sometimes the car stalls. It jerks when I shift from P to D or R, and when if I drive the car, it accelerates on its on up to 40km/Hr. I can only control it with the brakes, as there is usually no throttle response then. I understand it has to do with the throttle body assembly. I have replaced the throttle body about four or five times. The latest one, I had to order a new throttle body online which was fixed two weeks ago. One week later the codes with its attendant issues resurfaced. I really do not know what else to do. I am in an area where I do not have access to a variety of mechanics or auto electricians and I'm just wondering if this fault can be fixed for good. Please, any suggestion on what could be the problem? Thank you. |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 9:32am On Apr 11, 2017 |
Hello, while you are waiting for the guru in the house to break down the DTCs for you, when you replaced your throttle body did it come with new throttle position sensor and IAC sensor. Have you checked the wire harnesses to those two sensors. |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by dandollar1: 10:00am On Apr 11, 2017 |
olaboy1:yes it came complete with the sensor and the IAC. I replaced the harness sometime in February , just to rule out the possibility that the problem might be coming from there |
Re: On-Board Diagnostics (OBD II) - Questions And Answers Thread by olaboy1: 11:23am On Apr 11, 2017 |
Note that the throttle body (TPS and IAC) all work together with other components that our teacher many times has referred to as sub system, some of those are MAF and MAP. So give your MAF a check. Also check that you bought the correct part number of your entire throttle body assy, and I think you need an expert to re-program it to work with all the existing parameters stored in your ECM. The problem you described is a complete symptom of a bad TPS, you need your vehicle's FSM to know your exact part number, if it doesn't match it will never work well even if it's same make model and year of your vehicle.
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