knock sensor

joos14 · Post by **joos14** » Wed Dec 30, 2009 1:52 pm

ok i had a knock sensor code, so i pulled my knock sensor off my block found that the plastic housing on my knock sensor was cracked in 2 places. i replaced my knock sensor and now my knock sensor will not clear from my DTC's it keeps coming right back on, i checked the wiring and all is well.
any ideas will be helpful,
thanks
kyle

louiswun · Post by **louiswun** » Wed Dec 30, 2009 5:20 pm

did you check the resistant between two sensors ?

Matt · Post by **Matt** » Thu Dec 31, 2009 1:23 pm

may still be an issue if the resistance is out of expected range

joos14 · Post by **joos14** » Mon Jan 04, 2010 8:07 am

well i replaced the knock sensor with a new one would you think its still a resistance problem?

Preston · Post by **Preston** » Mon Jan 04, 2010 12:17 pm

Bad new sensor...it does happen...or bad subharness...or did you leave the key on when you installed it? It's rare but you can damage circuits sometimes when you plug in a sensor with the key on.

joos14 · Post by **joos14** » Mon Jan 04, 2010 2:37 pm

nope i had the key off cuz i did alot of work on it that weekend i replaced the knock sensor and i tried clearing the code while the engine was off and key on and while the engine was running didnt make a difference it would go off then few seconds later come right back on. before i replaced the old sensor when id clear it it would stay off for a couple of days or so but then sometimes it would come on the next time i started it..
im goin to bring my volt meter home from work someday this week and check the resistance

Amien · Post by **Amien** » Tue Jan 05, 2010 3:04 am

Have u torque the sensor to the correct spec ,if not it would cause the sensor bi metal insides to deform and cause premature failure.

joos14 · Post by **joos14** » Fri Jan 08, 2010 1:51 pm

yea i did everything the right way, I've been a nissan and toyota technician for 4 yrs now i just wasnt sure if there was a known problem with these. i checked for continuity in the harness and the sub harness thats all good, but i did find that my old knock sensor had a low resistance below spec and i found the new one isnt reading anything at all so im assuming that it was damaged during shipping.
thanks for all the help and tips

BlueRB240 · Post by **BlueRB240** » Fri Jan 08, 2010 2:09 pm

whats the OHM range suppose to be for a good knock sensor?

joos14 · Post by **joos14** » Fri Jan 08, 2010 2:36 pm

500-620k for SR and I i believe KA as well

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