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P0325 Knock Sensor

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boosted.rolla

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Discussion starter · #1 · (Edited)
Hi guys,

I've got a code P0325 and I know its the knock sensor. I've checked it and its plugged in tight so I'm thinking it is broken. While waiting for the dealer to deliver the item to me, Techstream showed me this:



Can anyone explain to me, I can't seem to figure it out. Does my engine get damaged?

BTW, its an engine swapped to my AE101 and the engine came from JDM Celica
 
#2 ·
Looks normal, long term trim is a little high at -10 but nothing awful. When there's a problem like that it'll run on a timing map that's very conservative and safe to reduce the chances of knock. Drive it gently till you get the problem resolved and you should be safe.

AE101 Corolla with a ZZ? 93-97 Corolla?
 
Discussion starter · #3 ·
Bitter said:
Looks normal, long term trim is a little high at -10 but nothing awful. When there's a problem like that it'll run on a timing map that's very conservative and safe to reduce the chances of knock. Drive it gently till you get the problem resolved and you should be safe.

AE101 Corolla with a ZZ? 93-97 Corolla?
Click to expand...
Okay great. I was too worried that the ECU won't save the engine since I was running on the freeway at that time and rev it around 5k not trying to hit lift though.

Does the code same if I put it the wrong gas causing detonation?

To be exact '94 corolla :)
 
#4 ·
I'm not sure what code you'd get if you use lower octane than called for, not even sure you'd get a code except maybe a lean or rich code or random misfire code, but probably the ECM just sees too much knock and pulls to a low octane timing map and you get crap gas mileage, lower power, but can keep driving safely. Might be harder on the cat converter though.
How the heck did you get a 2ZZ in a 94 Corolla? Why not a later 98+ Corolla that came with the 1ZZ? The 2ZZ is backward from the 7A-FE! Are you on Toyotanation in the Corolla forum there? Do you have a build log somewhere? I'd love to see!
 
Discussion starter · #5 ·
Bitter said:
I'm not sure what code you'd get if you use lower octane than called for, not even sure you'd get a code except maybe a lean or rich code or random misfire code, but probably the ECM just sees too much knock and pulls to a low octane timing map and you get crap gas mileage, lower power, but can keep driving safely. Might be harder on the cat converter though.
How the heck did you get a 2ZZ in a 94 Corolla? Why not a later 98+ Corolla that came with the 1ZZ? The 2ZZ is backward from the 7A-FE! Are you on Toyotanation in the Corolla forum there? Do you have a build log somewhere? I'd love to see!
Click to expand...
Okay 'cause we had an issue on 4AGE's using lower octane made the knock sensor crap. Its completely bolt-on except for the passenger engine support and of course you need to fabricate a new headers. Its the only car that I have and I had a good offer from my previous engine (4EFTE) so yeah ;)
 
#6 ·
Very cool, I bet it scoots! You should make a thread about it here or somewhere, I'd love to see some more about it.

Anyway, as far as I know knock won't hurt the knock sensor but I do know what you're talking about. Other cars have had issues with severe knock or even mechanical noise 'deafening' the knock sensors and causing problems or codes. Not the case with the 2ZZ knock sensor. Just make sure you get the correct 1 or 2 wire knock sensor depending on the year of ECM you're using.


4E-FTE is a pretty cool engine too. Going to boost the 2ZZ?
 
Discussion starter · #7 ·
I'm upping this thread since I've got the same code again after replacing the sensor a year ago! Does 2zz knock sensor known to go bad this easily?

If not what are the causes the knock sensor failed again? I haven't checked the wiring yet though.

Car is rarely driven so I'm changing the oil every 6 months including plugs with fully synthetic
 
#8 ·
It's punishment for not making a build thread or at least posting some photos of the thing! :rofl:

Maybe it's wiring, not the sensor? Check the wiring integrity between the sensor and PCM.
 
Discussion starter · #9 ·
Bitter said:
It's punishment for not making a build thread or at least posting some photos of the thing! :rofl:

Maybe it's wiring, not the sensor? Check the wiring integrity between the sensor and PCM.
Click to expand...
lol. I wish I did made a build thread before my old phone died at me. Hopefully I'm able to resurrect it and upload the photos here.

The odd thing here is that if I turned off the car and NO a/c the car runs fine no lights, no hesitation or whatever. Could it be the single wire knock sensor is sensitive to other noise? My a/c compressor is quite noisy, just in case.
 
#10 ·
It could be, the AC compressor shouldn't be loud enough to set knock codes. I'll see if I can lookup the trouble shooting flow chart when I'm home tonight and figure out how to send you it. It'll be for a Celica but since that's the engine/pcm you're running it should work for you.
 
#12 ·
I completely forgot to look that up, I'm sorry. PM me your email address and that'll remind me, I need it anyway cause it'll be a PDF I'll need to send.
 
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