Knock Sensor Error (34)

[battery]

so i'm getting error (34) from the ecu which is the knock sensor, the car runs like shit, really laggy high 1.5k - 2.5k idle....

but sometimes usually after 20mins of driving the error might go away and then the car is fine.

now i have read the sensors are next to cylinder 2 and 5 but that doesn't help much cause i have no idea what im looking for.

also i have read there is some resistor mod to trick the ecu, does anyone know about this?

its driving me crazy !!!!

[Sandeep]

yeah you can bypass the knock sensor with a resistor. where you put the resistor depends on where your knock sensor circuit has failed. There should be 2 sections of wiring from your ecu to the knock sensor. Would look be like this: [ECU-wiring loom-connector] and then [connector-sub harness- knock sensor]. Basically when your ecu will measure the resistance of this circuit and if you have say a faulty sensor or an open circuit this will cause your ecu to trip the error code which puts you in safety maps. This article isn't skyline specific (it's for a z32) but if you can find the knock sensor/ sub harness connector on your skyline you should be able to run the multimeter tests and figure out what size resistor you need and where you need to bypass it.

http://www.pexcom.com.au/z32cms/e107_plugi...php?content.429

just remember that if you do bypass it your car is pretty much unprotected if it starts to detonate. i'd only recommend that you bypass the detonation sensor as a temp fix until you can replace the faulty sensor or fix the open circuit.

[justin911]

if you go under your car you should be able to see and get to the knock sensors. there kinda above the start motor if memory serves. there yellow

[blind_elk]

The errorcode is raised because there is a problem in the operation or circuitry of the knock sensors. It DOES NOT indicate that there has been knock.

The high idle will, therefore, be unrelated to this error. Search for fixes to the AAC or adjusting the TPS. Those are the 2 most likely causes of high idle.

[battery]

alright thanks for the help guys ill get under the car during the weekend and see if i can find them

The errorcode is raised because there is a problem in the operation or circuitry of the knock sensors. It DOES NOT indicate that there has been knock.

The high idle will, therefore, be unrelated to this error. Search for fixes to the AAC or adjusting the TPS. Those are the 2 most likely causes of high idle.

yeh i have a feeling the high idle is unrelated but the knock sensor error is defiantly the cause of the car running shit so i plan to fix that then move on to the idle problem if it's still there.

are the sensors on the front or side of the engine? or both?

[MissR34]

the knock senors are at the front and back of the block, under the intake manifold.

[battery]

okay so i did the resistor mod which fixed the laggyness, but the high idle is still there.

ill check the TPS out on the weekend....