O2 Sensor Heater Wiring Test
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- Опубликовано: 17 окт 2024
- Explains the O2 Sensor Heater Wiring Test using cost effective procedures. Good for the Professional Tech or DIY .
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Absolutely mandatory before replacing an O2 diagnostic probe (downstream). I achieved the tests on PCM and probe. Good job, thanks.
👍
Very professional and technical excellence. The biggest headache on modern combustion engine vehicles near or exceeding 100k miles is the dreaded "check engine light". I didn't even know there was a heater inside these O2 sensors. Just a pain-in-the-ass to remove if not had anti-seize grease prior. That's just one issue now there's more headache with a heater issue. i.e. PO131 OBD2 code.
Best after purchasing any vehicle with 100k miles is to replace all of the O2 sensors for any unforeseen breakdowns ahead.
Ok
Thank you for your attention to the diagnostics questions. Your videos are nice and professional.
Thank you
Hi. I have four wire sensor. Which i understand the two same color which are white are the heater. But my question is, to do this test, how would i know which one is the heater ground? Thanks in advance.
Doesn't really matter, it's a good question, but it's a heater, so polarity doesn't matter. However, beware because the other two wires, one is black, which could be signal, and gray which could be ground. For some reason, these older aftermarket O2 sensors the black was signal and the gray was ground. Go figure... Good luck, Mandy. autodiagnosticsandpublishing.com/
Thank you, this video is amazing! I would like to ask, I have a motorcycle engine with a failed heater on the downstream 4 wire sensor, but I can't find an original used or oem part for replacement (I cant afford 450USD right now) but I see that Bosch once made a universal 4 wire O2 sensor ... is it reasonable that if I find a cheap O2 used sensor from a similar size engine from some other manufacturer - that I would be able to use that sensor if rewired correctly - are they all basically operating at the same output voltages?
Absolutely, yes and it doesn't even have to be the same size engine. The O2 sensor senses Oxygen independently of engine size. A new universal O2 sensor is probable less than $100.
Also, make sure your bike doesn't have an AFR or air fuel ratio sensor. They look the same, but are different. Good luck.
@@ADPTraining The bike is a 2008 Varadero 125, it has the smaller 12mm thread for the O2 sensors, so was thinking to get a reducer and use an 18mm O2 sensor but so far have been using the bike with the sensor missing - lots of secondary combustion on heavy de-acceleration, not sure if that's from the missing sensor or the less restricted aftermarket down-pipes (installed as a result of destroying the original during an engine swap) in any case, I really appreciate you putting these videos together, very well explained on the theory and the troubleshooting. 🙏Thank you!
hi please may i know if the two wire of heater can be interchangeable plus and minus.? thank you
Generally yes, but I'd try and properly connect the two.
Hi,! I have a question in itself, what are the resistor for? What are you doing?..
Instead of using a dome lamp to test the heater power and ground, could you use an old fashion 12 volt probe tester? The one with a wire that clamps to ground and a small bulb that lights when the probe is touched to 12 volts.
Great, make a vid about it then.
Thank you for the information.
Could you share with the wiring diagram for crankshaft position sensor for MR20 engine ?
Request here.
www.autodiagnosticsandpublishing.com/
Great video, I done a live test on my oxygen sensor, it comes on for like 30 secs then no response, I fitted a new sensor. Can this test find the fault. AUDI 1.8t engine, AGU, it’s been swapped into a mk1 golf/rabbit
You also have to make sure the O2 heater is working. Also, see if you have an AFR or a regular O2 sensor.
Searching for the options to remove P0446, I replaced 2 oxygen sensors (along with many others). 2001 Saturn SL2, 130K. After 10 mi got P0038. I thought defective downstream O2 sensor, but maybe it is just bcs the heater doesn't work in that car. But w/original sensor there was no code P0038. Can you clean those sensors w/some carb cleaner? So it will be more time to find a proper sensor, if it is not that broken heater of course. I would appreciate any opinion on this problem. Thank you for the
informative film.
Code P0446, otherwise known as Evaporative Emission Control System (EVAP) Vent Control Circuit Malfunction, indicates that your car's computer has detected (or believes it has detected) a problem with the function of the EVAP system.
This is a circuitry code. This has nothing to do with the O2 sensors.
@@ADPTraining Thank you, it is good to know that they are not related.
My oxygen sensor has 4 wires, 2 black, 1 white, and 1 blue. How do I determine which wire represents the terminal of HT, +B, OX, E1?
Depends on manufacturer.
great, useful video. I am hunting P2237 and P2238 for bank 1 sensor 1 on my 2008 Toyota 4RUNNER V6.. Bank 1 is a passenger side. I replace both upstream AF sensors a year ago for unrelated OBD II code with OEM Denso, I doubt the code I experiencing now are the faulty sensor itself. Sometimes these codes are going away and comeback several weeks or days after. Need to pinpoint.
I'm willing to bet on a Reflashing issue. It all points to that.
@@ADPTraining what is reflashing? You mean with ECM? I did not do anything with it, not even disconnect the battery.. Can you please elaborate? Thank you for taking your time to read and reply.
Greetings, I have Ford Focus 1.4 16V from 2003. My problem is that I only have error code P0420 and find out that my heater circle on both upstream and downstream are not working. There is 12 volts on heater element but the problem is ground which controls PCM. Is there any way to bypass PCM ground?
Not really. Need to find root cause.
I think that problem is in PCM because there is 12 v on pcm ground connector. But when I connect light bulb (12v 21w) and start my car bulb is not flashing. When I connect amp meter in series with heating element of O2 sensor by turning car key there is "spike" of 0.86 Amps and then lowers to 0.02 Amps. When car is running ampermeter shows constantly 0.02 Amps. I think that transistor or somethimg controling ground in PCM is burned. I was thinking bypassing PCM ground with chip 555 and some power transistor.
Ok. One question. The AFR heater (lsu 4.9 afr sensor) resistance or/and current value differs from light bulb resist/current. Will ECU will see that difference? If yes it will not close circuit and bulb will not flash...
Low current. Milli amp range
Great discussion
This video is very good to know tqvm Brother
what if the sensor's ground is computer controlled and it is short to ground. ??? p0141 . Ground is on all times , 12v wire is on all the time with Ignition on . code p0141 registered. how to find short to ground of the sensor's ground.? thank you 🙏
Well that's exactly how it works. Heater Gnd can't no on all the time. So, yes there is a short to ground. Sensor ground is on all the time, but the heater is either power controlled, ground controlled or PWM controlled on newer AFR sensors. www.autodiagnosticsandpublishing.com/
Interesting it would be nice if someone can do a video on the heater RELAY . Thanks.
There is no relay. Positive comes from the battery and negative from the ECU (computer). The heating element is constantly on when the engine is running
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Where can I get access to this software?
www.autodiagnosticsandpublishing.com/auto_repair_software_catalog.html
Very good movie. Thanks.
each wire turns black when clicking....makes sense. Would be a bad idea if to make them different colors, that would get confusing.
Great video Sir
Exselete. Video. Amigo. Nice. Video
Thank you...
sir may i ask your favor if ever i need a wiring diagram of car toyota landcruiser 1gr-fe
Yes, this is my product for that.
www.autodiagnosticsandpublishing.com/Automotive_Interactive_Wiring_Diagrams.html
Why not just use an ohmmeter to check the heater element or wiring?
Resistance testing us not loaded. Meaning there's no current flowing. Any issues will not come out Ohming out the circuit.
I think Lean condition is low voltage and rich condition is high voltage, But you are telling opposite, Pls. correct me if i'm wrong..
That is what i see. 0.1 v is lean. Therefor i got code P1273. so low voltage is lean °. Are we wrong=
Yes
Afr opposite of o2
can the heater wires be interchanged.? thanks
Yes, but why do that?
ADPTraining The answer is a little long but because you have the courtesy to reply my question I will explain, my daughter hit an street bump and the O2 conector disapear leaving the 4 wires rubbing the street, the car harnes conector was damaged, so I decide to connect the wires with but splicers and found the two heater wires are not color coded as the signal are, and because after clear the MIL, it came back with some heater low voltage code the only I can think it may be the problem, but I guess is not, Ihave to keep investigating, thanks so much and any help will be super appreciated
thanks for making such a good video.
No problem
Before teaching people try to teach yourself because you are teaching people wrongly, A high voltage signal indicates an imbalance in the air-fuel ratio - a low oxygen concentration in the exhaust gas (and an excess of fuel running through the engine) that means it is a rich condition not the lean condition, thanks
I hear you.
Asian cars can you make the wiring digram?
Sure, here's where to get them. www.autodiagnosticsandpublishing.com/Automotive_Interactive_Wiring_Diagrams.html
Thanks for the video.
Thanks Laurence...
Good info
How to fix p0420 code ??
thanks for this video
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Way too complicated... Just measure the amp at the fuse box and see what the current draw is. 5 minutes job. If you don't have an amp meter remove the sensor from the exhaust. Start the engine and hold the sensor with one hand. If you smell burning flesh, the heater works perfectly, if not replace the damn thing.
Hundreds of sensors get replaced needlessly. A loss for the consumer, shop owner. Thanks for posting. See our training downloads here.
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Swift sx4 check engine light is not working relay is ok plugs not get current and injector can't fire
Ok, the CEL not working is key here. Look for missing power or ground, but really look. That's the only explanation for CEL not working. Then of course if CEL not working, means no power/ground, no injectors, no spark, etc. Check and please repost back here, Mandy.
Lolpp Fhd check power and ground for pcm/ecm
Thank you
rig up some random headlights ?...that i just have sitting around to just do the test? this is way too complicated. testing procedure setup is too time consuming. how many people have random spare headlights sitting around their garage. maybe we can go to junkyard buy some for $30 which is the same as o2 sensor.
Cost nothing.
thanks very much
Cool
thanks this vedio
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Very confusing vocabulary, whats a headlamp? Does he mean a light bulb?
Exactly a Headlamp
Kripya Karke Hindi mein bataen
Yeah
thank you