Author Topic: knock sensor v+ question..  (Read 1154 times)

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Offline SleepaTi

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knock sensor v+ question..
« on: Sep 24, 2009, 07:36AM »
does anyone know what the voltage is at the knock sensor?

i couldn't find anything in the fsm's
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Offline Jono

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Re: knock sensor v+ question..
« Reply #1 on: Sep 24, 2009, 10:21PM »
It isn't a voltage, it's an audio signal.
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Offline SleepaTi

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Re: knock sensor v+ question..
« Reply #2 on: Sep 24, 2009, 10:32PM »
from the sensor loom??

.....i'm looking at getting a turboxs knocklite & needing to know what the sensor puts out, 1 wire is earth but i dunno what the other wire is/does
i need to know if its a V+ before i buy the knocklite

~KA'DE running KA'E ecu
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Offline SSS

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Re: knock sensor v+ question..
« Reply #3 on: Sep 25, 2009, 08:19AM »
It isn't adam. TXS knocklite needs a 12v feed, the actual knock sensor doesn't. Knocklite needs an rpm signal, knock signal (if you want to use it for that purpose, my knocklite is only functioning as a shiftlight atm as the knock sensor location i was using was shit and was too noisy to be accurate), knock sensor ground (from the sensor) and earth.

1 wire on the sensor is earth, the other is the knock signal wire. because knock sensors operate on the piezo electric principal, they generate their own very small voltages as an output to an ecu/knocklite where the device receiving the knock feed amplifies it to make it a usuable signal.

Offline Jono

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Re: knock sensor v+ question..
« Reply #4 on: Sep 27, 2009, 06:51PM »
All of the Nissan sensors I've seen only have one wire. They're grounded via the block.

And yes that single wire is the signal out of the knock sensor.
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