'12 Toyota Rav4 P2197 Quick tip & A/F Sensor operation video

[@VoltageDropDiagnostics]

Check out my amazon affiliate link to help the channel: www.amazon.com/shop/voltagedropdiagnostics

[@DanWallis86]

This would have to be hands down one of the best descriptions on operation. Thank you very much.

[@VoltageDropDiagnostics]

Thanks Dan!

[@thisisausername1265]

Good bypass to drive the circuit high and low. FWIW you can simply touch B+ or B- with lightly wetted fingers, and do the same thing. Lick your finger, touch your jump lead from B-, and hold a T-pin in your other hand to drag the circuit to zero. Use B+ to drive it high.

[@VoltageDropDiagnostics]

Will this work on wide and oxygen sensors?

[@thisisausername1265]

@@VoltageDropDiagnostics I've done it on many standard oxygen sensors. Being that AFR sensors usually don't fail low or high, instead having a bias in one direction, i don't normally have to drive them high/low with a jump lead as I can do so with other means. That said I'm pretty sure I used it on a Rav4 lambda sensor last week. Give it a try, it will pull up/down any circuit running on really low current. South main auto has shown it a few times. Lick both fingers, drag the signal where you want to. Obviously it doesn't move any current, but it will display on the scan tool.

[@rdaleyj1]

Since I don't have an led test lamp I gave this a try and sure enough it works. The a/f sensor reads from 2.6 to 2.9 key on engine off and when I touch the positive post, and when I switch to the neg post it goes to 3.3 and stays there. Does that mean the sensor is failed?

[@markinkster9257]

I enjoy ALL your videos. You are a very smart fellow and I am always happy to see a notification from VDD.

[@VoltageDropDiagnostics]

Thank you very much!

[@JarheadDiagnostics]

This is great, I enjoy the in-depth discussions.

[@VoltageDropDiagnostics]

Nice! Thanks for watching!

[@two6s722]

PJ, Please whip out the phone at every opportunity and post it up!! I maintain a a family fleet of 5 Yotas and you are easily the most valued diagnostic guy on youtube, imo... I appreciate any and all of your content, thank you!!

[@VoltageDropDiagnostics]

haha Thanks man! I'll continue making little short videos like this

[@jeffreyherbert91]

Really good style of video and one of the best descriptions of how to understand how an af sensor works and how to test

[@VoltageDropDiagnostics]

Thanks Jeff!

[@throttletherapy9998]

I really like the explanation, there are a lot off us techs out there that typically work in the independent shops and we don't always get the up to date training, especially with this virus scare, so we really have to go looking for information and like you my shop has not slowed down at all I have been working 7 days a week for the last several months just to keep from getting behind on work. A couple of years ago there wasn't much info on A/F sensors so I am slowly getting up to speed and seeing you do that test to confirm circuit integrity is a big help. Thank you again for taking the time to make these videos, they are greatly appreciated!

[@VoltageDropDiagnostics]

Thanks Keith! I'm glad that people like these style of videos! I plan on doing more. I wasn't sure if people would like this style or not.

[@jeremystone6613]

This format gives great value. A combination of the diag process demo with technical explanations gives a theoretical and practical demonstration which a lot of people will benefit from. Your explanation about current flow here is a great example. Thanks for sharing.

[@VoltageDropDiagnostics]

Thanks Jeremy! I'm glad that you liked the format!

[@exmotorsports]

Great Video PJ..I do like this type of video. Sometimes getting down and dirty along with being busy at work makes it difficult to fully explain in detail like you can afterwards with charts. Love it, Keep them coming Bro.

[@VoltageDropDiagnostics]

Thanks 👍

[@billyyoder8171]

Thank you Patrick. Good job. Have a blessed and safe week to you and your family.

[@VoltageDropDiagnostics]

Thanks Billy! I hope that you and your family are staying safe as well!

[@MPEREZZ143]

Yes, I enjoy the depth discussions.. thank you great job 👌

[@VoltageDropDiagnostics]

Glad you like them!

[@michaelbel2749]

Absolutely enjoy videos like this. Mix practical shop tome with classroom style theory is a great way to teach. Only thing I would add is screen time of work while you are discussing theory would add to the depth of the instruction. Really love these videos. I'll be watching as long as you make them.

[@VoltageDropDiagnostics]

Thanks man! That's a good point you made about adding screen time!

[@michaelfannin5456]

I like all your videos. I feel like I've learned a lot from you. You explain the way a system works that I can understand. Keep up the good work.

[@VoltageDropDiagnostics]

Im glad that theyve helped! Thanks for watching!

[@AD-T]

Doing a great job bro I think short and simple and doing an explanation later when you got more time is great . Because you got to keep making money and time is money .

[@VoltageDropDiagnostics]

Thanks Andrew! For me it wasn't about the money. We were so busy I was worried about getting home at a reasonable time lol.

[@AD-T]

@@VoltageDropDiagnostics I hear you thats why I got on salary so ill be sliding down that dinosaur tail when that clock hits 6pm just like my buddy Fred Flintstone

[@Silentb00]

I like it short and straight to the point

[@VoltageDropDiagnostics]

Nice! I continue making similar videos

[@codysautodiagnosticsprogra8706]

Great video Pat. Definitely like the style of video and going into the explanation. Sometimes you just have to get down and dirty with it LOL

[@VoltageDropDiagnostics]

hahah! I need to work on being a better one handed tech though! It is so hard to hold a phone and work on a car at the same time!

[@christopherryan1036]

Awesome video! I appreciate the information.

[@VoltageDropDiagnostics]

Thanks!

[@PaulysAuto]

Excellent video Pat, I really like how you explain everything in detail. This was extremely helpful and you do an amazing job of covering the entire circuit in depth. Also, great to see an LED test light put into use to diagnose circuit integrity. Absolutely grab the down and dirty (when able) and then follow-up with this type of instruction...top notch bro! Keep these videos coming my friend!

[@VoltageDropDiagnostics]

Thanks man!

[@PaulysAuto]

@@VoltageDropDiagnostics i mean it, this is my FAVORITE

[@DIYDaveOK]

Love the discussion on the AFR operation!! Thanks, PJ!

[@VoltageDropDiagnostics]

Thanks Dave!

[@gregeconomeier1476]

Like all styles of videos. Same ..Same is boring to me. I really enjoy a Logical detail explaination.

[@VoltageDropDiagnostics]

Thats a good point about making videos the same style over and over again. They do get boring!

[@mechauto1764]

Sincerely I have learned a lot from you . The more the better

[@VoltageDropDiagnostics]

Thanks Charles!

[@richardostrowski6420]

Great video and explanation of A/F sensors. Please keep them coming.

[@VoltageDropDiagnostics]

WIll do! I have a couple that need edited!

[@chekelley6861]

Best explanation ever!👍🏽

[@VoltageDropDiagnostics]

Thanks!

[@djosbun]

PJ saves Monday by releasing a video! Quick tips like this one are excellent!

[@VoltageDropDiagnostics]

haha! Thanks Dave!

[@mansouralblooshi3004]

Crystal clear buddy. Thanks for sharing 👍

[@VoltageDropDiagnostics]

You bet

[@bernardaflores1720]

I believe Honda's AFR is a double pump design. Great explanation of the on the workings but need to include the heater side since they are high temperature requirements for this to work properly.

[@bettylane1984]

Thanks for a good practical video on the air/fuel ratio sensor. These are brand specific and less generic than O2s. Harder to keep up with stats that are good or bad. 😁

[@VoltageDropDiagnostics]

Yeah, they are very much brand specific BUT lambda is always lambda. Which is what I use on cars that I'm not familiar with!

[@ginoroy3234]

definitely have a better understanding of this sensor now 👍

[@VoltageDropDiagnostics]

Thanks Gino!

[@loproautorepairco.363]

Thank you PJ for another great video. Excellent explanation. Would definitely love to see more videos like this.

[@VoltageDropDiagnostics]

You got it! Thanks for watching!

[@jgeorges3061]

any video /info is a good one in my book from yah u r AWESOME as always Pat and thank u for sharing. cheeeeers

[@VoltageDropDiagnostics]

Thanks for watching!

[@diegorubio1073]

Really enjoyed this video , I would like to see some of these video of you explaining scenarios or tests like this again awesome video

[@VoltageDropDiagnostics]

Thanks! I'll try to make videos like this occasionally as well!

[@Peter-hc4di]

Wow.. This is so very well explaned, its perfect! Thank you soooo much!

[@VoltageDropDiagnostics]

Glad you enjoyed it!

[@kingofspades5098]

Love this style of video

[@VoltageDropDiagnostics]

Thanks! Ill be sure to make some more similar to this. I get so many cool cars with cool failures but I just don't have the time to do a full length video. I'll start trying to do more videos similar to this!

[@odishoodisho4904]

Great video thanks for sharing your knowledge waiting for more information 👍

[@VoltageDropDiagnostics]

Thank you!

[@TemporallyHandle]

Quick and on point👍👍

[@VoltageDropDiagnostics]

Thanks!

[@tommego1]

Today I learned something new, thanks a lot.👍🏻🤝

[@VoltageDropDiagnostics]

Any day that you learn something new is a good day!

[@mekenzim6413]

Great concept for future videos.

[@VoltageDropDiagnostics]

More to come!

[@orville58]

Love any information I can get I’m a sponge keep them coming thanks for sharing your knowledge

[@VoltageDropDiagnostics]

Thank you! I am also a sponge! When I'm not making videos myself, I am constantly reading and watching other youtubers!

[@jonathanmacleith7810]

Very good explanation!

[@VoltageDropDiagnostics]

Thanks!

[@DonDenaBrenna]

Keep doing them. Great info

[@VoltageDropDiagnostics]

Thanks, will do!

[@juanportillo2201]

Great video! I am always learning from you. Thank you!

[@VoltageDropDiagnostics]

Thanks Juan!

[@kennycolden3629]

Great video. Love the idea. Would like to see more like this.

[@VoltageDropDiagnostics]

Nice! I think I'll be able to make more videos using this style. Like I said, I still want to make some full length videos, but sometimes it is hard depending on the day.

[@hamham4547]

Great video and explanation thank you, how many wire in toyota af sensor?

[@VoltageDropDiagnostics]

They have 4 wires. 2 for the heater and two for the signal

[@hamham4547]

@@VoltageDropDiagnostics thank you so much

[@fixgarage3209]

Thanks again we always like your videos

[@caliautotech21]

Love it! Great explanation! Def would like more of these

[@VoltageDropDiagnostics]

Thanks man! I can't wait to see more videos from you!

[@JoelAutomotiveInaction]

Wow that was great explanation 👏

[@VoltageDropDiagnostics]

Glad you think so!

[@theGADGETSplaylist]

learned something here! thanks PJ

[@VoltageDropDiagnostics]

Thanks for watching!

[@Hscope-User]

Great information, thank you for taking the time to put this together 👍

[@VoltageDropDiagnostics]

My pleasure!

[@danman9017]

thank for taking the time

[@VoltageDropDiagnostics]

No problem! I enjoy helping!

[@pl5882]

Good video. Definitely one to save for reference.

[@VoltageDropDiagnostics]

Thank you!

[@Waelkhalafabdelrehiem]

Great one keep on

[@VoltageDropDiagnostics]

Thank you!

[@bnewton239]

it was great info well done.

[@VoltageDropDiagnostics]

Thank you!

[@david619dc]

Very nice video I love it!

[@VoltageDropDiagnostics]

Thank you very much!

[@raviautoscanning]

Clear. Thank you

[@VoltageDropDiagnostics]

Welcome 😊

[@richardcranium5839]

great video and explanation. may i suggest the explanation first then the shop clip last?

[@VoltageDropDiagnostics]

That might not be a bad idea!

[@romanosautomotive]

Great vid PJ

[@VoltageDropDiagnostics]

Thanks buddy!

[@leninandrade7258]

Both styles are good.

[@VoltageDropDiagnostics]

Thanks Lenin!

[@DJ-tn7vj]

Loving it bro

[@Leo00893]

Great video bro can you do 1 on evap with a bad charcoal

[@IAMNOSLEEP]

Thanks for sharing... Cheers.

[@VoltageDropDiagnostics]

Cheers!

[@ivandrago2557]

Great explanation. Is it always that only higher voltage side(+) measured by PCM or could be lower side (-) also measured by PCM.

[@VoltageDropDiagnostics]

I'm not sure of other makes and models, honestly. But I am fairly certain that Toyota only uses the higher side.

[@ivandrago2557]

@@VoltageDropDiagnostics Thanks

[@bartscave]

I like both

[@VoltageDropDiagnostics]

Thanks Bart

[@andrewcimochowski]

Small videos great also...

[@VoltageDropDiagnostics]

Glad you like them!

[@georgebonney90]

Great video i really appreciate it 👍

[@VoltageDropDiagnostics]

Thanks George! You just won something too, didnt you? I think that I seen that somewhere! Congrats lol

[@johnavila7942]

Your awesome

[@VoltageDropDiagnostics]

haha Thanks! And so are you!

[@alanw5879]

Hello there,,I know this is somewhat an older post, but since youre the Toyota go-to guy, Have you ever had an older camry (2004) with an A/F sensor heater code p0031 cause a bog down type of symptom? I had one and the sensor was bad, (OL on the sensors heater), but I didnt get to fix it due to the customer refusing repair because of high mileage (270k) on the clock. But it had this bog out whenever hitting the throttle, I expected to find fuel pressure dropping out like a rock, but it was fine, cats were fine also,. I could only conclude the one front A/F sensor not getting to temp and not working was causing this issue. Its eating me up not being able to have replaced then sensor and find the actual fault if it was something else. MAF reading was good too, but I did notice the rear 02 going lean at WOT. so I know it was starving for fuel.. Just one of those that I cant stop thinking about..

[@d.d4184]

Any video we can learn from is good. PJ just wondering were you got the led test light. I can't get one anywhere so I made one for the moment. Don't say snap on as my local man is the worst.

[@VoltageDropDiagnostics]

snap on test light. 24 easy payments of $25.99 haha. Honestly, I found this at a lowes recently. It is just a craftsman led test light.

[@d.d4184]

@@VoltageDropDiagnostics 😂😂Thanks PJ. I am in Europe we don't have craftsman but I am sure I'll be able to bring one in. You need to start selling these. Impossible to buy one on the Internet. Like gold dust.

[@automotivediagramsreading9711]

Thanks for the explanation..i need help on a 05 camry 2.4l. I have a p0171 code..maf and a/f sensor has been replaced without any effect on fuel trims.. ltft 44 stft 20..i smoke test intake and exhaust system no luck..remove and test fuel injector for pattern spray and amount of fuel no luck..check for fuel pressure and volume..pressure 48 to 50 psi..volume 6 to 8 glp..spark plugs look fine..check for pcv..purge valve..booster leaking no luck..i am out of ideas..i erase the code an as soon as start the engine maybe 30 to 1 mim lean code comes back..this is the third toyota i have no found the issue within one year..help please.

[@VoltageDropDiagnostics]

I have a couple different videos diagnosing lean codes. The diagnostic process starts with WHEN is it lean? At idle, or under load?

[@automotivediagramsreading9711]

At idle its ltft 44 stft 20...3000 rpm ltft 24 stft 20...crusing ltft 16 stft 14..

[@smms5056]

👍👍

[@VoltageDropDiagnostics]

Thanks!

[@martinarrieta248]

Longer diagnosis

[@VoltageDropDiagnostics]

I'll try!

[@neema7837]

Your diagrams are inaccurate and your explanation flawed. Voltages do not overcome each other. Read the documentation on the component and further research the topic before posting videos. Your explanation about lambda is accurate.

[@VoltageDropDiagnostics]

Those diagrams are straight from toyota training. But thanks for commenting