Code 34 Knock sensor issues - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Zach321 · 09-12-2013, 11:37 PM

I've got a freshly rebuilt dohc ka, s13.

I checked my ecu for codes a while back, and it threw 34 for the knock sensor.

I replaced the knock sensor, still threw the code. After that, I replaced the subharness that goes from the wiring harness to the knock sensor.

I ohmed the old sub harness and it had read 0 ohms, I ohmed the new one and it had 0.5 Mega ohms, I believe, or could be Kilo ohms.

Thinking I had fixed the problem, I reset the ecu and it threw 34 once more. I checked the sender wire and it was sending 5v to the sensor, as I read that it should be. So after replacing everything, its still throwing the code.

The CEL doesn't normally come on when I'm driving when the engine is cold, but it comes on when its warm and when I'm accelerating, under deceleration the light goes off. I'm completely stumped. When the CEL lights on, I can feel it miss a bit and it doesn't feel right. But when the lights off, it runs pretty smooth.

What could this be? I've read things like, bad neutral position switch, bad transmissions, mounts and leaky injectors. Far out things that wouldn't have anything to do with the knock sensor but I just don't even what to do now.

Should I bypass it?

09-12-2013, 11:37 PM	#1
Zach321 Join Date: Sep 2013 Location: Tennessee Age: 32 Posts: 4 Trader Rating: (0) Feedback Score: 0 reviews	Code 34 Knock sensor issues I've got a freshly rebuilt dohc ka, s13. I checked my ecu for codes a while back, and it threw 34 for the knock sensor. I replaced the knock sensor, still threw the code. After that, I replaced the subharness that goes from the wiring harness to the knock sensor. I ohmed the old sub harness and it had read 0 ohms, I ohmed the new one and it had 0.5 Mega ohms, I believe, or could be Kilo ohms. Thinking I had fixed the problem, I reset the ecu and it threw 34 once more. I checked the sender wire and it was sending 5v to the sensor, as I read that it should be. So after replacing everything, its still throwing the code. The CEL doesn't normally come on when I'm driving when the engine is cold, but it comes on when its warm and when I'm accelerating, under deceleration the light goes off. I'm completely stumped. When the CEL lights on, I can feel it miss a bit and it doesn't feel right. But when the lights off, it runs pretty smooth. What could this be? I've read things like, bad neutral position switch, bad transmissions, mounts and leaky injectors. Far out things that wouldn't have anything to do with the knock sensor but I just don't even what to do now. Should I bypass it?