KNOCK SENSOR

[jdmDAvey]

i have an 89' 240 that i just put a CA in. I hooked up the knock sensor but it doesnt run right and is throwing a code "34", which is the code for knock sensor. I am just wondering how do you wire it up correctly, so that i can double check. There has been so many different posts on how to do it, i might have done it wrong. I have also tried to use a 10k Ohm resistor connected to the ground wire, and still have had no such luck. Any help is appreciated.

And YES, I have searched a lot.
Modified by jdmDAvey at 5:45 PM 7/29/2005

[r34 gtr]

just wire it directly to the ecu. dont bother trying to splice it in anywhere, just run wire from the pins on the ecu to the connector on the knock sensor. thats what most people end up doing.

- tim

[jdmDAvey]

Thanks for the help, I'll give it a shot. Its the only thing i havent tried yet.

[NeedCAforS13]

mine is hard wired to the ECU as well.

[8ggalant]

well it this just started happening to me today but im throwin the code as well...but i checked the connection (hardwire) and its fine...also checked @ the block and its fine...do i need to replace it...if so w/ what...checked the parts page and all the knock posts...any suggestions??

[float_6969]

Does the plusar have a knock sensor? I would think it would. It should be the same.

[8ggalant]

Does the plusar have a knock sensor? I would think it would. It should be the same.

thats what i was thinkin...im gonna look it up now

[NeedCAforS13]

pulsar one should work. I've never replaced mine, but I know they are $$$ new from the dealership

[8ggalant]

pulsar one should work. I've never replaced mine, but I know they are $$$ new from the dealership

ouch gotta pay to play tho i guess lol

[jdmDAvey]

OK, so I've got 2 options... Hard wire from 23 to sensor, which I already tried and it didnt work. Or... Run the resistor from 23 to 20 without looping it? Which didnt work also. So what I'm trying to clarify on is should I hard wire the resistor from 23 to 20 inside of the ecu? And, having it wired into the harness, is it picking up other signals? Hum... The weird thing is that she still acts like the knock sensor is messing with the timing and throwing off my a/f, even though its not currently wired. BTW, it majically started throwing code 12 also, which is the AFM. Any ideas. Thanks again

[8ggalant]

from my understanding if the knocksensor is not connected it will still act as if it seeing detonation...(happened to me)...

try checkin the voltage/resistance (whatever it is) to see if the knock sensor is any good (instructions in the fsm)...im doin this tomorrow tho im pretty sure i need to replace mine

[jdmDAvey]

Thanks man. Good thoughts. Hey if you need a junkyard knock sensor for some reason, I think Im going to get a couple tomorrow.

[sdtouge]

any one ever try to just unplug the sensor out of the block, and just ground the actual sensdor inside your car and plug it in somewhere like that lol?

[onevia1800cc]

this might be off topic butwhat EXACTLY are your symptoms from this??i am wondering as my ca backfires and runs rich as i accelerate, sometimes it will run perfect for 20 min or more, then she wants to start backfiring and sputtering i have changed my coilpacks, changed my ignitors (i have 3) i'm about to try swapping my coolant sensor this is driving me crazy. just thinking it might be the knock sensor is incorrectly wired

[8ggalant]

ecu will pull timing...u'll get alot of misfiring/backfiring under boost...umm...those are the ones ive seen...there may be more tho

davey...let me know if u find an extra sensor

[onevia1800cc]

i have seen one sold under nissan pulsar on ebay or ca18/ca18deit was like 25 BIN