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Old 07-15-2008, 01:48 AM   #1
Scooby Newbie
Member#: 74030
Join Date: Nov 2004
Location: Evergreen, CO
02 WRX

Default Help w/ knock sensor

I have a Zeitronix WBO2 and it has an feature to log aux. sensor data 0-5v. I was hoping that I could monitor the knock signal with this. There are 2 wires @ the ecu for the knock sensor. 1 is called "signal" and reads 2.8 v the other is called "shield" and has 0v. I taped in to the signal wire and the Zeitronix unit reads a constant 2.8v even when knock occurs. Do I tap the "shield" wire instead? I guess I don't understand how the knock sensor reports knock to the ECU.
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Old 07-16-2008, 10:24 PM   #2
Scooby Guru
Member#: 53443
Join Date: Jan 2004
Location: Anchorage, AK
2001 LL Bean Outback


The knock sensor is a piezio elecrtric device. As it detects vibrations from a misfire it sends out a frequency signal. It isn't a DC level change.
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