Replaced the knock sensors and sub harness, still have the same codes. Check knock sensor signal at the PCM and have a good signal, has anyone else had this problem with Toyota?
What is the torque of the sensors? The torque is very important as this can affect the sensitivity of the sensor.
keep in mind I use aftermarket parts quite a bit, but if you used aftermarket knock sensors on this vehicle they will not work correctly.
We too have had issues with aftermarket knock sensors in particular from memory is Hondas and Toyotas
Maybe just maybe the knock sensors are doing their jobs and sensing something mechanical wrong causing the sensor to react and set codes.Normally a knock is predetination and the sensor tells the system to adjust the timing to compensate for it.But the system cannot determine if the knock is from predetination or a rod knock so it sets the codes that you are…
Hi Stuart: You raise a good point. Almost 20 years ago, Tom Roberts did a …e study where it was the engine block creating the knock sensor symptoms. Going from memory, there were no discernible noises or vibrations. It needed a short block. He found it using his scope. (He did a presentation on that …e study about a year later.) That's not to suggest hunting for zebras on a horse farm but…
The reason I brought this up is from experience that I has with an 03 Trailblazer with over 300,000 a few years ago.Replaced the motor and when we tore down the old motor a couple of wrist pins had some play which we think caused the knock sensors to come into play even though it wasn't bad enough to hear the knocking which this case might be similar.
OE Sensors? Torqued to spec??
What kind of signal did you have at idle
I have had the exact same problem many times. Make sure that the sensor is originated in the right direction. That you have torqued the sensor bolts to spec. Last, use OE sensors and harness ONLY!!!! Have have had at least 5 out 10 Toyota aftermarket sensor fail out of the box. It took 5 before the shop owner would suck it up and get the more expensive one from the dealer.
Hi Phillip: I'm curious. Which was was "more expensive"?(rh) Did you end up putting a zipper on it? ;) Guido
The point was the owner was trying to be cheap. But after paying me twice each time it would been cheaper to have gotten the OEM one. Which i believe he just wanted to have a bigger mark u
What is your scope pattern with cheap sensors compared to oe sensors
I don't remember off the top of my head. I think they just didn't work. I do remember that some would work fine till you drove them.
I encountered a similar situation on a Nissan vehicle.The real cause was an inoperative vvt system in which the ignition timing was pegged at 17deg BTDC at idle.