It's a good idea to make sure that the sensor is connected properly before removing/testing/replacing. I went through the hassle of ordering a replacement, worrying about damaging my car when I was driving it while I waited, etc. Eventually I figured out that the sensor had just come loose. Could have saved myself a lot of trouble.
Concise, thanks friend. Great tutorial. I've also learnt that the sensor is piezoelectric and connecting one lead of the multimeter to the sensor and the other to ground and knocking the engine with a hammer will create an AC voltage if its good.
Excellent description of the problem. I would also point out that you could reference common on the block for the voltage test in case you have a bad ground on the block. Chances are you would have several other fault codes in that condition but it’s always a good check.
Thank you and excellent tip as well. Yeah Subarus are known for having ground issues just in general and I believe there are kits available to solve this issue.
If you had a bad ground on the Block would that only give you a low sensor reading? I am having p0328 high sensor input. I am, wondering if that isn't it because I know there is one of those ground wires hanging loose on the side of the engine
Couldn't you have just tested from the connector terminal to the bolt on the block with the ohmmeter to verify the whole circuit in place without taking the sensor out?
alex laverick you could have but there’s a chance that you would have another resistance in parallel which would ultimately give you a lower resistance and a possible false reading. This eliminates that possibility. The one test you can do with the sensor still connected is the voltage test from the sensor supply in the harness to the bolt on the sensor. This gives you a chance to see if the engine block is properly connected to common rather than referencing the negative side of the battery.
do you know if the knock sensor connection is with one or two wires?, i have a nissan x terra, and i don´t know if is only one wire or the second wire is broken. thanks, great video!
In Nissan models, one pin is ground and the other is the signal. If you check continuity with a multimeter, one show 0 ohms and the other maybe 10 ohms or nothing if the sensor is damaged.
what happens with my car is it loses power between 3000 and 4000 rpm, then after 4000 it accelerates normal, when i drive the car slowly for 2 days it goes away, and this happens more in heat weather..above 30 degrees celcius, once i replaces the sensor it cost me 80$... but when i drive the car aggressively it breaks again.. so i take it slowly.. especially not for long period
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It's a good idea to make sure that the sensor is connected properly before removing/testing/replacing. I went through the hassle of ordering a replacement, worrying about damaging my car when I was driving it while I waited, etc. Eventually I figured out that the sensor had just come loose. Could have saved myself a lot of trouble.
Concise, thanks friend. Great tutorial. I've also learnt that the sensor is piezoelectric and connecting one lead of the multimeter to the sensor and the other to ground and knocking the engine with a hammer will create an AC voltage if its good.
Pretty in depth video, all i was looking for was the testing stage, which was hard to find in this video.
Good video for beginners.
Excellent description of the problem. I would also point out that you could reference common on the block for the voltage test in case you have a bad ground on the block. Chances are you would have several other fault codes in that condition but it’s always a good check.
Thank you and excellent tip as well. Yeah Subarus are known for having ground issues just in general and I believe there are kits available to solve this issue.
If you had a bad ground on the Block would that only give you a low sensor reading? I am having p0328 high sensor input. I am, wondering if that isn't it because I know there is one of those ground wires hanging loose on the side of the engine
I wonder if several knock sensors could be used on a door knocker to trigger a bell.
Nice Video.
Do you have an idea what´s might be the problem when I still have failure 22 after replacing the knock sensor?
Couldn't you have just tested from the connector terminal to the bolt on the block with the ohmmeter to verify the whole circuit in place without taking the sensor out?
alex laverick you could have but there’s a chance that you would have another resistance in parallel which would ultimately give you a lower resistance and a possible false reading. This eliminates that possibility. The one test you can do with the sensor still connected is the voltage test from the sensor supply in the harness to the bolt on the sensor. This gives you a chance to see if the engine block is properly connected to common rather than referencing the negative side of the battery.
Can a knock sensor cause a misfire? Popping from the intake
No
I'm doing a head gasket on my 2001 2.5 Subaru..and the sencor,is cracked pretty bad..so no need in testing,,if still good, it won't last long
do you know if the knock sensor connection is with one or two wires?, i have a nissan x terra, and i don´t know if is only one wire or the second wire is broken. thanks, great video!
In Nissan models, one pin is ground and the other is the signal. If you check continuity with a multimeter, one show 0 ohms and the other maybe 10 ohms or nothing if the sensor is damaged.
what happens with my car is it loses power between 3000 and 4000 rpm, then after 4000 it accelerates normal, when i drive the car slowly for 2 days it goes away, and this happens more in heat weather..above 30 degrees celcius, once i replaces the sensor it cost me 80$... but when i drive the car aggressively it breaks again.. so i take it slowly.. especially not for long period
excellent presentation, short, compact,,,, to the point. many thanks from Lismore NSW Australia.
The wires coming out of my car are reading 3.3 volts. Is this too low? What does this mean?
Mine too. Can't find the answer for this anywhere
i did everything you said. Change out with thee old, in with the new, but still getting that Error code for the knock sensor
Dom you can also test the sensor connected to the engine. Look for an actual voltage or frequency from the sensor. If none it's toast.
Excellent, thank you, probably saved me a bunch of money 😂
Awesome to hear, happy I could help!
Hi, Good video! I have a 2001 outback 2.5 my code is po327 knock sensor voltage low input, does that mean my sensor is bad? thanks.
+jlc7300 I would double check the voltage going to the sensor first before replacing it as it's a pricey part to replace if it's not the issue.
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Mine says 510 M ohm is that the same as k ohm?
M means megohms which is larger than K or kilohms, so the sensor is still good.
Ok thanks. I ended up just cleaning the ground connection on the sensor and my light went off
No 5 volt not. Reference
550k is it good reading?
+deadcandance The sensor needs to be a minimum of 400k in order to determine if it's still functioning correctly. So 550k is a good reading.
+4DIYers Thanks for reply but I've found a significant crack on sensor so this one goes to trash.
Thanks!
صباح الخير اين مكان حساس الطرق في تاهو2003
genial tu video saludos