Decided at weekend to finally bypass the knock sensor as running on safety mode.

Knock sensor appears to have no resistance or harness has broken down.

 

After much time researching wire diagrams, the sensor has one wire from ECU pin 23 and this is the signal wire and the other wire being shielding around it which is ground. Basically a coaxial cable.

 

My problem is that I have tried the 1 m ohmn resistor trick at the Harness ECU side and no luck, still getting code 34. I then decided to take it right back to the ECU to eliminate faulty wire.

I have done the following, picked up pin 23 on ECU HARNESS and soldered 1m ohmn resistor then grounded it to engine block.

Reset ECU clear codes, start engine run for about 30sec turn off. Check codes

Code 34 is BACK!

Am guessing the resistance is wrong?

 

Any suggestion

Decided at weekend to finally bypass the knock sensor as running on safety mode.

Knock sensor appears to have no resistance or harness has broken down.

 

After much time researching wire diagrams, the sensor has one wire from ECU pin 23 and this is the signal wire and the other wire being shielding around it which is ground. Basically a coaxial cable.

 

My problem is that I have tried the 1 m ohmn resistor trick at the Harness ECU side and no luck, still getting code 34. I then decided to take it right back to the ECU to eliminate faulty wire.

I have done the following, picked up pin 23 on ECU HARNESS and soldered 1m ohmn resistor then grounded it to engine block.

Reset ECU clear codes, start engine run for about 30sec turn off. Check codes

Code 34 is BACK!

Am guessing the resistance is wrong?

 

Any suggestion

 

1 m ohmn is right and pin 23 is right

So what else can be causing the code to return?

So what else can be causing the code to return?

 

well it must be either faulty resistor...not solderd right and are you sure your on pin 23 plus have you disconected the plug from the dett sensor also

All soldered correct and defiantly on pin 23.

Am picking up another resistor tomorrow, am thinking the same Znut, must be faulty resistor, no other reason really.

I let you know the result!

All soldered correct and defiantly on pin 23.

Am picking up another resistor tomorrow, am thinking the same Znut, must be faulty resistor, no other reason really.

I let you know the result!

 

also make sure its a half watt 1 Megohm ;)

Cheers Znut I will,

I know this is an old thread but did you find the problem ? a friend of mine is got same problem.

The issue can be caused by the sensor or the loom. The code is for Det sensor circuit rather than sensor specifically. This could be a break in Sub harness for the sensor, the plug or further back. My problem was on the Engine harness side of the loom an inch behind the plug.

on my mates z I can't even see the plug ,the one from the loom ...you can see someone relocated the knock sensor using a new one with new sub harness but the problem is I cant see the plug where I can try the resistor. If i'm running a wire straight from the ecu does it have to be a special wire or a normal wire will do? also what color is the wire ?I know is pin 23 but just to make sure...

The connection should be on the firewall next to the O2 sensor and idle plugs. Big chunky square thing.

I believe it's a white wire, there's a quirk to it though iirc, like to the plug is one cable and after is two. It's a perculiar sheathed cable that uses the sheath as a neutral.

I went to a breakers and took a knok sensor and plug off a Nissan almera and just soldered it into my loom and bolted it to the inlet manifold to hold it. Never had a problem since :D

My problem is that I can't find the wire but i'll have another look today .Thanks guys.

Did this get resolved? Code 34 come up today on my zed. Already have the bypass, so might have to do something like this.