2002 Isuzu Rodeo (misfire, low power case study, reversed O2 connectors)

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For more information about O2 sensor and fuel trim diagnostics, refer to Sections 4 and 5 in my eBook available at www.scannerdanner.com.
Link to the Hyundai case study I mentioned in this video • P0133 O2 Slow Response...
In this video I cover the following:
loop status (open loop, closed loop and open loop faults)
How to test an O2 sensor for response
Is the O2 sensor lying?
Rich and lean air fuel ratios
Short term and long term fuel trim
For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdan... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

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21 окт 2024

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Комментарии : 106

@eliudgarciagonzalez8002 7 лет назад

Hi Paul, I've been following you for a while, I have your ebook and a premium channel subscription. You changed my life man. I have a couple of questions about this video. At the 16:29 mark I understand that the right side graphs are the downstream sensors and that the cat on bank 2 (top right) is better than the cat on bank 1 (bottom right). But the bottom right graph PID says O2S12. Is this the name for an upstream sensor for bank 2? If so, could it be that the O2S12 is a cold or bad upstream sensor? And the top left graph O2S21 PID is bad cat on bank 1? Thank you for your amazing lessons.

@ScannerDanner 7 лет назад

O2S11 = bank 1 sensor 1 (upstream) O2S12 - bank 1 sensor 2 (downstream) O2S21 = bank 2 sensor 1 (upstream) O2S22 = bank 2 sensor 2 (downstream) Thanks so much for your continued support! And for your kind words. To hear things like "you changed my life man" is absolutely amazing. I am so thankful when you guys share this type of stuff with me. It makes it all worth it.

@eliudgarciagonzalez8002 7 лет назад

Thanks for your reply. I’ll pay close attention to wiring harness and PIDs to keep me from making a bad call. I have great respect for your hard work and effort. Your material is top notch. I’ve been able to accomplish so much thanks to you. God bless you.

@nashkabir4050 3 года назад

i guess I am kind of randomly asking but does anybody know a good website to stream newly released series online?

@hankcooper7124 3 года назад

@Nash Kabir I would suggest flixzone. You can find it by googling =)

@jasonfrank4991 3 года назад

@Hank Cooper definitely, I have been using Flixzone for years myself :)

@williamtust5186 4 года назад

The BESt explaination I have ever observed... I'm a ECU developer but not automotive type... yet!! Thank You for education!!! You are a 10++

@cordis65 6 лет назад

I have tried everything to fix these symptoms on my Isuzu Trooper. Began after a transmission rebuild. All makes sense now. Thank you for such a good post and diagnosis.

@ScannerDanner 6 лет назад

Awesome! Thank you

@rclaycawley7386 4 года назад

Charles Elder Same here!

@strongarmteebee 5 месяцев назад

i have a trooper the obd2 cant be read/connected its 1997 v6

@sivucit 11 лет назад

Paul I am waiting for this video for atleast 3 years and finally saw this video, this is worth of a million dollar.. because you always told me in pm, that o2 is crossed, but only today i understand the concept..

@dolanellis 3 года назад

Wow! I have been trying to figure this issue out for the last couple of weeks. Swapped the plugs and my passport is running like a charm!

@ScannerDanner 3 года назад

Glad it helped!

@leandroleyva4487 11 лет назад

Mr Danner I love all of what you do to help all levels of mechanics in general. Thanks.

@marksponge9852 11 лет назад

Very helpful video...Came across a guy having the same problems with his Rodeo last week after his vehicle was fitted with a second hand engine...Ill have to give him a ring...Cheers!

@LynxStarAuto 9 лет назад

I had this happen to a buddy's Nissan Frontier. He purchased it from a DIYer after it suffered T-belt failure. He redid the entire top end this drove us crazy for a bit, until we figured it out. On the Frontier it was a bit more obvious the connectors were swapped because they both live right next to each other, and go secured on top of the valve cover. Swapped then, and truck ran like a dream. This is why I like to use a marker, and run a line across similar connectors at different points. When assembly time comes, you can distinguish whether the two connectors belong together or not.

@ScannerDanner 9 лет назад

+Lynx Star Automotive (Gabe V) nice

@ChicoDeon Год назад

YOU ARE THE MAN,THANK YOU VERY VERY MUCH For SHARING The KNOWLEDGE.

@jarinwilson9539 11 лет назад

Wow a negative short term fuel trim number of 65, I have NEVER seen negative fuel trim numbers like that before, that is intense. Great video once again Paul

@donkeyboywikiwr.8696 4 года назад

wow man you just helped me diagnose the same issue we had with the 2002 isuzu that we did a transmission rebuild on last year those harness' really don't look like they can get crossed.thank you thank you thank you,,,,,,,subscribed!!!

@moto616714 9 лет назад

great video have same truck and same problem only the wire harness had been changed do to fire change all 4 o2's still same problem watched this video and went out and changed wire harness around runs great very helpful thanks

@stevey500 2 года назад

Absolutely wonderful video. I've got a 2004 3.5 GDI isuzu rodeo with a pretty unknown history. Starts up and idles great. When cold, it'll increase RPM to max ~4000 with some misfiring. Once warm, it wants to stall if any throttle is applied. It'll increase RPM only with WOT but very rough, barely fires- idles mostly fine with a bit of a stumble. Only code is stating high circuit on MAF, previous owner states MAF was just barely replaced to try and resolve this issue. Will chase for bad grounding- maybe pop the ECU open and tear apart the harness to check for bad wiring and traces.

@ericdube836 Год назад

When I got my 2002 Isuzu rodeo sport it had a lot of obscure electrical issues different things would happen stuff would turn on and off I regrounded all the grounds 4 or 5 grounds there were a lot it fixed electrical issues I also found a speed sensor on the left side of the transmission wires were broken re wired it and no more high idle shifts at about 3200 rpms also EGr valve get stuck and behind the throttle body there is a EGr aka nox tube mine had the tiniest hole through it it a pain in the butt to clean the tube but with a drill and a piece of breaded steel wire you can fray the end as to act like a brush or a gun cleaning brass 30cal will work also if you remove the EGr valve there is a hole that leads into the intake manifold tube u can spray carb or break cleaner in it and blow it out with and air compressor

@ericdube836 Год назад

You can also clean the mass air flow sensor too should help unless the sensor is broken

@ScannerDanner 11 лет назад

for sure, looked like this one was okay though. Also don't forget about converter damage.

@ScannerDanner 11 лет назад

I am jealous! I got to see the Vantage Pro at a conference over the weekend.

@Puertoricojunn 11 лет назад

Good video, I always had a problem reading the fuel trims lol, your videos are definitely helping, thanks and keep putting cool videos like that one !!

@cholacmk 7 лет назад

Awesome video I suspected this after a gearbox drop but the video confirms this.great help

@ScannerDanner 7 лет назад

awesome! thanks for watching

@alexdeegan81 11 лет назад

really john doe? anyway paul iwas going to get with you on buying the newest verus pro loaded out while trading in solus ultra and vantage pro but after using it for a couple of days it was a no brainer with you and your great instructual vids! it so much more user friendly and has cut my time down exponentially. thanks again!

@ElectronicWorkshop 11 лет назад

Once again, great instruction Paul

@hethaerto1 6 лет назад

Outstanding troubleshooting!!

@shigerunakahara6995 5 лет назад

i did check on my rodeo , and saw that in fact had reversed connector , thanks for the info regards .

@ScannerDanner 5 лет назад

sweet! nice find

@ScannerDanner 11 лет назад

refresh my memory my friend. I don't remember. Have you and I talked about this before?

@nestorfresno1 11 лет назад

Another great video Paul,..I have being watching your videos for the last year i've being traveling alot to Mexico due to family situation, and your videos are awesome you use alot of good techniques I'm from Fresno and my freinds from AESWAVE.Mario, Gorge ,Carlos recommend your book,which I will defentely purchase it when i get back to Fresno,thank for sharing your videos and your experience Paul you are great instructor

@ScannerDanner 11 лет назад

I may have misspoken, but I have seen a jumped belt cause positive trim numbers on a 4 cylinder. I do not know if I have seen one go rich on a separate bank. I suppose it is possible on a dohc v type engine.

@sivucit 11 лет назад

Yes Paul. My id in youtube got changed to my full name from sivucit. I bought lot of vidoes, books and bothered you a lot at many occasions. I specifically asked this question being one bank going rich and other bank be low when i bought a video from you. you gave me the answer but only today i got the insight.. Thanks much.. I think you are gifted to explain most difficult part as a very simple one. Trust me, this is a difficult subject to explain.(atleast to me)

@LynxStarAuto 11 лет назад

With cost savings the way they are today, most manufacturers use the same connectors for multiple sensors. Isuzu is definitely not the only one. Most vehicles I have seen share identical O2 sensor connectors. The only difference being if they are upstream or downstream. In defense though, if you look closely, that harness had a mounting ring where it was bolted somewhere, at some point. This falls more on sloppy tear down/rebuild, than identical connectors.

@marksponge9852 11 лет назад

Yes you were spot on...He had the wires around the wrong way..Another problem solved.. Cheers!

@luisgeras72 11 лет назад

Hi Mr. Danner, do you have any video on wrong O2 installed? I came across a 00 cal. emiss. camry with an HO2 instead of an A/F ratio sensor and I caught it thanks to what I've learned in your exellent videos.

@abbeyrham4220 11 лет назад

great video, excellent explanation. Paul is there any possible way you would have caught the problem without a scan tool?

@tek2471 3 года назад

At 16:33 Paul mentions briefly while looking at the rear O2s that bank 2 has a better working cat than bank 1, but from what I can tell bank 2 is running leaner, shouldn’t the voltage be near .700-.800 on a rear O2 that has a good working cat? Any help would be appreciated.

@sailorbob74133 6 лет назад

Great vid! You mention in the video that you've seen this reversed fuel trims problem also caused by timing issues. I've got this exact problem, although less severe, and I've already verified the O2s are correctly connected. Do you have a video showing this problem when it's caused by timing?

@camshaftcarb 11 лет назад

He spoke the truth. Any bank to bank imbalance of airflow on a V-type engine can cause opposing fuel trims. If the cam timing is off, one bank doesn't open the intake valves soon enough and doesn't consume all of the available air. This air can go to the other bank causing your imbalance. You could see similar issues with one side of the exhaust restricted, one side of the engine worn out, and so on.

@ScannerDanner 11 лет назад

thanks Curt!

@ScannerDanner 11 лет назад

What year, make, model and engine? Thanks

@XcomProbo 11 лет назад

Hey ScannerDanner thanks for your vid! What does it mean if you've only got 1 O2 sensor but your bank 2 fuel trim sits around 25% and then jumps around 30-40%? This is for a Ford inline 6 engine.

@ScannerDanner 11 лет назад

Nice! I'll bet it is the same problem

@butch19471 11 лет назад

Scanner where can I get the printed vesion of your book?Love the videos and I'm only DIY guy but watch all of them.

@fmwiebe 11 лет назад

Wow fantastic video. Thanks for the the upload. This will be a great help!

@ScannerDanner 11 лет назад

I haven't but I have heard of that.

@CaddoComanche-gp2pr 7 месяцев назад

Hey thanks for u info y help me fix my problem i had the same issue on mine , thank u very much for u entire video🧑‍🔧🧑‍🔧

@ScannerDanner 7 месяцев назад

You're very welcome!

@strongarmteebee 5 месяцев назад

i have a ls v6 3.2 1997 trooper. i am having trouble in connecting the obd2. but the obd on my motorcycle is fine that is why i think my trooper have a obd port problem

@jamesford8952 11 лет назад

Maestro danner . muy buen vídeo .podría hacer algunos en español se lo agradecería mucho

@alexdeegan81 11 лет назад

I'm pretty sure you meant versus pro. My snap on guy gave me really good trade values but still a bit pricey. But I love it. I'm sure you should get good trade in being as you are advertising for them and basically sold me. Pitch that to them

@luisgeras72 11 лет назад

not so sure about that but in this case it didn't, the owner had installed te HO2 himself and obviusly the MIL came on again, so when I checked it in the shop the last thing I suspected (before connecting the scan tool) was the HO2 because it look new. By the way, scan data was fix at 3.27 v which make me think that this car was a cal. emiss. so we had to call the dealer to confirm cause there was not emission label under the hood.

@ericdube836 Год назад

I have this same Isuzu it started acting weird it ran relatively well but would be sluggish after spending way too much time underneath the truck I discovered my back 2 o2 sensors had come undone i plugged them back in ran like when I bought it

@DennisBohannan 8 лет назад

man if you have pay pal I will send you 20 bucks. I swapped the clutch out on my rodeo and had the front right and left rear backwards. It for so natural but was wrong. did take me some time to find the color diagram though, but boom she is running good. hope I didn't jack up the cats ran it running bad for probably 200 miles.

@tomdewey9907 11 лет назад

Paul, on a side note (per my previous comment), if this vehicle uses dual cat-converters, I would bet the one on the over-rich running bank is trash now based on the on the OBD scope wave-forms shown. Let us know... Thanks,, Tom D.

@xFranK91 11 лет назад

could the rich condition ''where fuel was being dumped constantly inn the wrong bank'' cause o2 damage? from contamination of fuel saturation over long periods of time?

@spelunkerd 7 лет назад

At 18:00, after the fix, there is still a major difference between the two downstream O2 sensors, downstream bank 2 is rich, bank 1 lean. Why? Is it because the cat on bank 2 was flooded with fuel for so long that there is residual fuel still dripping through the cat, overwhelming the cat? Would that be expected to clear over the coming days as the residual fuel is blown away? Or is it evidence the cat has had permanent damage because of the persistent rich condition on that side?

@ScannerDanner 7 лет назад

It's been a while man. Maybe what you saw was the result of me not clearing the fuel trim memory?

@spelunkerd 7 лет назад

Thanks for responding, Paul. Great channel!

@gvvq-pi5ml 9 лет назад

Hi Paul i just wanted to say, that we in the uk, say when a 4 cylinder car is running on 3 cylinders, we don't call it a miss fire, we call it a dead cylinder, we call a misfire when it runs on it sometimes and not others, just kind of missing on that cylinder...if its totally dead we don't say it has a misfire...don't think i am criterising because I'm not...Fred in England.

@gvvq-pi5ml 9 лет назад

+Tom Smith PS i know it has nothing to do with this video before someone comments...

@ScannerDanner 9 лет назад

+Tom Smith thanks Tom

@cougar10ag 10 лет назад

Had one come in that just had the trans replaced. Same issue, o2s reversed.... They dropped the ball on this one making it easy to accidentslly swap the o2 harness

@JoelAutomotiveInaction 11 лет назад

awesome video

@damonking6853 2 года назад

Good job man

@8power0 11 лет назад

It seems to me a lot of shops do not know fuel trim operation strategy.

@saffronwales 10 лет назад

that was actually a really interesting video, thumbs up :)

@XcomProbo 11 лет назад

It's an Australian car. 2003 Ford Falcon BA XR6. 4.1L straight six cylinder DOHC with variable cam timing. Known as a Barra 182.

@dalix1951 11 лет назад

Paul-Great info as usual and never mind that stupid comment from Dohn Joe, this person should be thankful you're teaching him something instead of criticizing you for pointing at 2 different graphs. By the way Mr. Dohn don't include US in your comment I'm pretty sure you're the only one being annoyed.

@ahill007ny 11 лет назад

AWESOME VIDEO AS ALWAYS!!! I REMEMBER THE HYUNDAI :)

@ScannerDanner 11 лет назад

some luck, a wiring diagram, and a visual inspection of the wire colors

@AaronWerner 8 лет назад

I am wondering if anyone reading this might be able to help me. I purchased a 2002 isuzu rodeo that had an engine swap with a honda passport. The people who swapped the motor got everything hooked up but the o2 sensors because they had different connector on the ends. They used the engine harness wires from the Honda thinking they would just plug up to the isuzu but when they made it to the o2 sensors they realized they did not fit. My question is...can I just swap out the 02 sensors to the ones with the correct mounts that match (honda) or will I have to replace the entire engine wiring harness? Also, is there a way to identify what o2 connectors go to what sensors? When I got the vehicle all the wires were just dangling from the transmission. Anyone know of an online wiring diagram in the event I can keep the existing wiring harness so I know how to connect what wires to what o2 sensor? Thanks for all your help

@ScannerDanner 8 лет назад

+Aaron Werner Yes you can (get honda O2 sensors) As far as wiring goes, there is a DIY version of the program I use called Mitchell1 DIY. Look it up. It's about $15 to purchase a three day pass for your car. Then you can print up the diagrams you need.

@AaronWerner 8 лет назад

Thank you for your video and all the help I had another question. If the o2 sensors were not connected with a cause the motor to run at about half the power and just not run very well another mechanic suggested that the timing may have been off when they returned it and I'm just trying to determine if its the timing or if its the o2 sensors

@AaronWerner 8 лет назад

+ScannerDanner So, in your video this isuzu was misfiring etc...with the crossed o2sensor wired. If I had no o2 sensors hooked up would the engine run in a similar manner. I am working on an isuzu rodeo that I purchased with a swapped engine and the o2 sensors are not hooked up (have to order the sensors with correct connectors). They also timed the engine before they swapped it...could it also be the timing?

@yasharrezakhan433 7 лет назад

it was perfect like always.

@jammerk65 5 лет назад

MY PROBLEM WAS A DIRTY AIR FILTER, CHANGED IT AND LIGHTS WENT OFF, POWER CAME BACK !!!

@wildimpo 10 лет назад

so even if a o2 sensor is bad it may throw a misfire code? does anyone know what the most common problem with these ? plugs ok coils ok.

@johnmckamy6398 8 лет назад

nice catch

@luisbalmaceda03 4 года назад

I have an isuzu axiom that just gave me a reduced power light and when i gas it it doesnt do anything.

@ScannerDanner 4 года назад

you have codes when that happens, follow your codes

@tomdewey9907 11 лет назад

Hi Paul; Another great video.... Got to love other people's repair attemps ending up as a "rats" nest in your back yard (LOL). It seems a little weird that Isuzo engineering would have made such a real BASIC mistake in that the bank-1/bank-2 wiring harness connectors were not UNIQUE and could be interchanged??? After running this engine post-FIX, I wonder if there was any long term engine damage done (totally whacked out fuel mixtures--bank.1 & bank.2) Tom D.

@Mark1944089 11 лет назад

What did u guys learn from this?

@JohnDoe-yj5ng 9 лет назад

It looks like the bank 2 cat is no good and needs to be replaced. The downstream voltage O2 sensor is following the upstream sensor, therefore the cat is not doing its job.

@ScannerDanner 9 лет назад

Keep watching brother

@71geomar 8 лет назад

ok buddies i have isuzu rodeo 04 the bank 2 all the 3 cilinder dont working when all the coils are connected but if i disconnect the 3 coils of bank 1 they ,re working ider way if i disconnect the bank 2 the bank 1 work good wtat is the problem i my scanner gave me this code P1312 for the ion sensing module circuit line 2

@ScannerDanner 8 лет назад

Thats an unusual system. First thing. You have to use a factory spark plug on these systems. Does it have factory plugs in it? Also we need to finish this on my forum because we can share pictures and wiring diagrams. scannerdanner.com/forum/post-your-repair-questions-here.html

@ScannerDanner 11 лет назад

Either from me if you live in the lower 48 or from aeswave. Send me a pm

@curtlockhart4413 11 лет назад

great info Point any way you want to as long as I can gain knowledge I am all for it, finally got subscribed to the channel had to use my yahoo email to do it but I got it done. thanks again, ( critter )