Honda Civic: P0453 Finding The Bad Connection - Part I
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Date: 2021-04-13
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Comments and reviews: 9
autos
The reason pcm side is close to 5v when is connected to nothing is because pcm uses so called pull up internal resistor or some sort to connect it to 5v reference voltage internally which means when the pcm side connection is open, PCM will read close to 5v(5v minus voltage drop across the pull up resistor. If signal wire to pcm is intact, the sensor signal wire sends the signal voltage(bt 0 to 5v, this voltage will pull the PCM side voltage down to be same as the sensor signal voltage.
In Eric case it reacts the same way as I explained.
This is common practice across all computerized electronic sensing components. All are using pull up circuitry. it is fail safe, easy to diagnose. sample like when is open, the pcm reads 5v and pcm knows open wires.
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The reason pcm side is close to 5v when is connected to nothing is because pcm uses so called pull up internal resistor or some sort to connect it to 5v reference voltage internally which means when the pcm side connection is open, PCM will read close to 5v(5v minus voltage drop across the pull up resistor. If signal wire to pcm is intact, the sensor signal wire sends the signal voltage(bt 0 to 5v, this voltage will pull the PCM side voltage down to be same as the sensor signal voltage.
In Eric case it reacts the same way as I explained.
This is common practice across all computerized electronic sensing components. All are using pull up circuitry. it is fail safe, easy to diagnose. sample like when is open, the pcm reads 5v and pcm knows open wires.
reply
Yawwee
Sure are a lot of SMA videos with mouse turds in the vehicle! Are there Mouse ride sharing pickup stops scattered along Avoca's roads? Maybe a Mouse village, city or town that people live in around Avoca? I can't imagine going to work and having mice scurrying all around under the dash, and inside the glove box! I live in Florida pan handle and have never seen any squirrels, raccoons, opossums, musk rats, bobcats, mountain lions, anacondas, pelicans, geese, ducks, pigeons, cranes, or alligators in our dash areas or in the glove box! Must be a New York thing! Let's see what part two brings! Anticipation, anticipation, it's making me crazy!
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Sure are a lot of SMA videos with mouse turds in the vehicle! Are there Mouse ride sharing pickup stops scattered along Avoca's roads? Maybe a Mouse village, city or town that people live in around Avoca? I can't imagine going to work and having mice scurrying all around under the dash, and inside the glove box! I live in Florida pan handle and have never seen any squirrels, raccoons, opossums, musk rats, bobcats, mountain lions, anacondas, pelicans, geese, ducks, pigeons, cranes, or alligators in our dash areas or in the glove box! Must be a New York thing! Let's see what part two brings! Anticipation, anticipation, it's making me crazy!
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Nodak81
Such a crock that state inspections instantly fail your car if the CEL is on. Modern cars can have the light on for many things that have NOTHING to do with emissions. My Taurus kept having the light come on because the fuel level sensor wasn't reading correctly, something that has zero impact on the emissions system. Should be illegal for them to have blanket policies like that, they should have to prove the CEL is on for emissions reasons.
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Such a crock that state inspections instantly fail your car if the CEL is on. Modern cars can have the light on for many things that have NOTHING to do with emissions. My Taurus kept having the light come on because the fuel level sensor wasn't reading correctly, something that has zero impact on the emissions system. Should be illegal for them to have blanket policies like that, they should have to prove the CEL is on for emissions reasons.
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Supersonicf111f
Referral = We watch you're videos, but don't want you to know that.
Also, really good troubleshooter are born with the logical skills hardwired. Just like people highly skilled at other endeavors in life. Who hasn't wished they could do something they can't? Always wished I could sing, but couldn't carry a tune if you could put it in a bucket!
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Referral = We watch you're videos, but don't want you to know that.
Also, really good troubleshooter are born with the logical skills hardwired. Just like people highly skilled at other endeavors in life. Who hasn't wished they could do something they can't? Always wished I could sing, but couldn't carry a tune if you could put it in a bucket!
reply
DaddyBeanDaddyBean
It makes so much sense to test at the sensor end first, and then jump all the way to the Box O' Magic Smoke and test at the other. Everything in between is a lot harder to get at, so taking a shot at eliminating all that mess all at once with a single test at ECM is just good wrench-bending. Well done, sir, well done.
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It makes so much sense to test at the sensor end first, and then jump all the way to the Box O' Magic Smoke and test at the other. Everything in between is a lot harder to get at, so taking a shot at eliminating all that mess all at once with a single test at ECM is just good wrench-bending. Well done, sir, well done.
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Bill
As mush as I love the Brake clean videos ( I don't know why) these types of diagnostic/Easter egg hunt see if you can find me videos are my favorite, I think Eric O must have grown up wanting to be part Vulcan, Logic people Logic, it's my best friend.
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As mush as I love the Brake clean videos ( I don't know why) these types of diagnostic/Easter egg hunt see if you can find me videos are my favorite, I think Eric O must have grown up wanting to be part Vulcan, Logic people Logic, it's my best friend.
reply
Black3ternity
What'ya want me to do with it?
Suck on it?
I love the way you proof your thesis and figure out that stuff works.
I work in IT - not on cars but this different approach is lovely and inspires me to think outside the box.
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What'ya want me to do with it?
Suck on it?
I love the way you proof your thesis and figure out that stuff works.
I work in IT - not on cars but this different approach is lovely and inspires me to think outside the box.
reply
BobFob
Isn't there a method where you inject an AC signal (e. g. 1V peak-to-peak) into one end of a broken wire and then go along that wire with a capacitive probe to see where in the wiring harness you can pick up that signal and where not?
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Isn't there a method where you inject an AC signal (e. g. 1V peak-to-peak) into one end of a broken wire and then go along that wire with a capacitive probe to see where in the wiring harness you can pick up that signal and where not?
reply
mag1vl
Hey what am I hearing here Wrong hole - Sucky Sucky - Blow - Where are you baby - Get in the hole baby - Come here honey - Hold still - Gotcha all taken out of context, but seriously can't wait for the fun to begin in part 2.
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Hey what am I hearing here Wrong hole - Sucky Sucky - Blow - Where are you baby - Get in the hole baby - Come here honey - Hold still - Gotcha all taken out of context, but seriously can't wait for the fun to begin in part 2.
reply
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