The Trainer
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- Опубліковано 19 тра 2024
- Do you find yourself troubled condemning a catalytic converter simply due to dreaded stored DTCs P0420 and/or P0430? Welcome to the club!
Many technicians today still don’t quite grasp the functionality of the catalytic converter. In this episode of The Trainer, join Motor Age Magazine’s Technical Editor, Brandon Steckler as he demystifies the catalytic converter’s functionality.
Because the catalytic converter functions as it does due to a chemical reaction, it has certain requirements to function properly. The feed gas that leaves the internal combustion engine drives its performance.
A catalytic converter has two main areas that operate to chemically convert the harmful post-combustion gases (Hydrocarbon, Carbon monoxide, and Oxides of nitrogen) into non-poisonous gases (Carbon dioxide, nitrogen) and water (H2O2). These areas are the reduction section and the oxidation section. Each of these contains different combinations of precious metals that will react to rich and lean feed gas mixtures differently.
The catalytic converter’s job is to store oxygen and use that oxygen for the chemical reaction. This means very little oxygen should leave the catalytic converter if it is functioning properly. The PCM monitors the signal from the rear (post-CAT) oxygen sensor to determine the CAT's ability to store and use oxygen. Currently, there are two ways the PCM can determine this:
• Switched-Index Ratio
• Oxygen Storage Capacity (OSC)
As diagnosticians, we can learn to leverage graphed scan tool data to make diagnostic decisions right from the driver’s seat! Follow Brandon as he carries out this simple and easy-to-perform process using global/enhanced scan tool data.
Brandon will demonstrate the operation of a known-good catalyst, using both the OSC test and the Switched-Index Ratio test. Pull up a chair, stay tuned, and learn the techniques that made Brandon successful and efficient as a driveability diagnostician in the trenches!
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Tutorial outstanding, BRANDON STECKLER MOTOR AGE
My Mentor
Can't wait for the next training video
👍
SHARP ,BRANDON STECKLER MOTOR AGE
From Nick Ayivor from London England UK 🇬🇧 ⏰️ 21:17PM Good Evening
Thank you, Nick!
Ty sir for taking the time out and giving us a refresher!
It's my pleasure, Honestly
Tremendous amount of detail in a very easy to follow learning curve ! Thanks again Brandon ! Thanks for “feeding “ our appetite for mastering automotive diagnostics .
👊🏼 🔥 🐱 💻 📈
Thank You!
Precision with COMPREHENSION and awareness of variables
Winner winner every time
💲♦️🇺🇸🎓😁
Thanks for the video 👍
MOTORACE
Thanks! And it’s my pleasure!
Great refresher by Brandon Spectacular
Thank you ver much!
Ty for a great educational program!!!
Thank you!
1998 4.6 crown Victoria P0420 P0430 correcting the problem reprogramming the ECM!
extraordinary video and very interesting as always, thank you for sharing your knowledge
Thank you so much!
Never seen this method. Usually see 5 gas analyzer tail pipe testing. Thanks for another option. Also hope Pete is doing well
Pete is FANTASTIC, as always!
as usual a lot of good information. I really enjoyed the forst section describing how the cat works. it helps me understand why the post cat o2 sensor does what it does.
my question is how do you check a cat with a wide band sensor that hardly moves on the screen. it's one thing I can't wrap my head around.
NICE Job again!
Thank you!
Abundance of knowledge thank u
It's our pleasure, thank you!
Thanks again very good description very good scope patterns indicating problems
My eyes are so used to graphing using an oscilloscope. I would have loved it's use here.
Excelente!👏👏👏
Thank you!
Is there a rule of thumb on the lag time if you were to use a scope?
That’s a great question. I have never seen anything documented but I’ve seen older vehicles with a lag of 7 seconds and brand new cars with a lag of about 3 seconds.
I have never seen less than 3 without pending DTCs (P0420 or P0430).
Oh I thought this was a video of animals that say meow.
Meow is what you say when me have to pay for a expensive converter
Appreciate the video.
Very nice tool
Great video thankyou for posting
Thank You!
Good video and explanation!
Thank you!
Retired ASE mechanic changing my 68 C10 pickup over to a 6.2, 6l80 trans system, I'm opting to stay with variable valve timing, maybe a very slight tune, but staying with cats and slightly concerned about taxing the cats with a tune change.
Variable valve timing is a win/win for performance and emissions (450 HP stock or lower)!!
Any thoughts on your end??
All bets are off unless the tuner can compensate. The difference between poor-performing CATs and a MIL is in the software.
If the tuner tells the PCM to keep its eyes closed…no MIL
Dear friend. You think than the problem with catalic maybe in the software (computer)? I buy one but I need to find some technic than program it. Some technic said than there is the problem. Here in Puerto Rico is difficul find a good one. Thanks for your information.🙏
I would really need to see some data to make a decision. I’m sorry
Sorry my friend. The second question was not for your. I thick than other persons coment and I can send a question. Sorry again.
Hi Brandon, great video and, once again, saved it to my UA-cam diag folder.
Two questions come to mind...
1- Do you have a rule of thumb to determine at which point the time difference is to short and you are confident to condemn the CAT?
2- Should I back this up with scope data? I ask because although I can see there is a time difference on scan tool graph data, I don't really see the time base so ti makes it hard to judge.
Thanks again for all your do for the industry.
First of all,...Thank you! And great question. I wish I had a better answer for you, though. I typically view the data LIVE, so I get an idea of how much time has elapsed.
Makes sense... I guess it's one more case of "look at known good until it's familiar enough to spot when it wrong"
Thanks again.
thanks mate 🙂
Thank you!
This is what I call UA-cam University if you select the right classes, you will graduate with A+. Thank you! Motor Age classes are the best. thumb up! please share like and subscribe.
Thank you very much. We are very happy you are finding the content useful!
Nice 👍
Thank you!
Hello friend. Hector from Puerto Rico. Good explication. I have a question about catalic. I have a camry 2004 3.3 with 115,000 miles . Have the code P0430. I do a tune up and add a catalic cleaner. The light ve on but later come off. Three days later come on but was the bank 1 sensor 1 and buy one original. Seven days later come on with the code P0430 again. The car run perfect, the only issue is the light. Some technic from here and outside tell me than the problem is the computer. In base of your experience, what you thick? Bad catalic ir Bad computer. I hope than bright me some explication m. Thanks a lot.🙏🙏
I will need to see data to make diagnostic decisions