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Knock Sensor indication and testing ?

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Old Apr 4, 2004 | 11:53 AM
  #1  
BobMax's Avatar
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From: eastern, MA
Knock Sensor indication and testing ?

Question: The knock sensor resistance should be ???

I have a mis fire problem (another thread). The computer is showing a knock sensor code. I thought the CEL would be a misfire, but it's 0304 - KS.
I tested it at the KS connector. I got infinite resistence. No connectivity. The Haynes Manual says to use a meter that can measure up to 10meg-ohm resistance, mine only goes to 2meg-ohm. But, I swear I saw another post here indicating that it should be 470ohms or maybe 470K ohms. Can anyone help me on this ?

Also... Haynes says that it *generates* an A/C current on knock... so,
if I disconnect it, shouldn't the car assume it's not knocking ? Or do I have to
put a resistor in series with one of the terminals to simulate it ?

Thanks,
Bob
Old Apr 4, 2004 | 12:31 PM
  #2  
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From: New Jersey
Originally Posted by BobMax
Question: The knock sensor resistance should be ???

I have a mis fire problem (another thread). The computer is showing a knock sensor code. I thought the CEL would be a misfire, but it's 0304 - KS.
I tested it at the KS connector. I got infinite resistence. No connectivity. The Haynes Manual says to use a meter that can measure up to 10meg-ohm resistance, mine only goes to 2meg-ohm. But, I swear I saw another post here indicating that it should be 470ohms or maybe 470K ohms. Can anyone help me on this ?

Also... Haynes says that it *generates* an A/C current on knock... so,
if I disconnect it, shouldn't the car assume it's not knocking ? Or do I have to
put a resistor in series with one of the terminals to simulate it ?

Thanks,
Bob
i dont kow if a bad KS is spposed to cause a misfire, i couldnt tell the sensor was bad until i experienced horrible gas mileage...i think your coil packs might be going bad, thats just a guess though but your KS might have already been bad and your coils might be intermittently functional,
its suposed to be 470k ohms as far as resistance is concerned,

as far as disconnecting the sensor, the ECU runs the check at startup, if it gets no response from the KS as functioning, itll retard the timing to a safetable so that itll be incapable of knocking,
Old Apr 4, 2004 | 06:02 PM
  #3  
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From: eastern, MA
Originally Posted by mansurxk
i dont kow if a bad KS is spposed to cause a misfire, i couldnt tell the sensor was bad until i experienced horrible gas mileage...i think your coil packs might be going bad, thats just a guess though but your KS might have already been bad and your coils might be intermittently functional,
its suposed to be 470k ohms as far as resistance is concerned,

as far as disconnecting the sensor, the ECU runs the check at startup, if it gets no response from the KS as functioning, itll retard the timing to a safetable so that itll be incapable of knocking,

Yeah, I figure the miss is the coils too. I think I narrowed it down tonight
on the coils and I'll pin that down tomorrow with a part swap.

If it's 470K, then I have a problem with the KS too. I *really* don't want
to pull those manifolds, but it looks like I'm hosed.
Old Apr 4, 2004 | 06:16 PM
  #4  
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From: New Jersey
Originally Posted by BobMax
Yeah, I figure the miss is the coils too. I think I narrowed it down tonight
on the coils and I'll pin that down tomorrow with a part swap.

If it's 470K, then I have a problem with the KS too. I *really* don't want
to pull those manifolds, but it looks like I'm hosed.
why would you pull the manifold? do you have the 99 model? you can follow directions from www.motorvate.ca and get to it with a pivoting 12mm and some extensions, i di it on my 95 took 25-30 minutes , if i were to do it now it would take me 10 minutes at most.

EDIT: its 550 k-ohms as suggested in the faq
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