Knock Sensor
07-23-2009, 08:10 AM
#1
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Location: Newnan, GA - Stillwater, OK
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Knock Sensor
Can anybody tell me the resistance on a good knock sensor. I have a check engine light due to the knock sensor. The harness wiring is throwing out ECU's because of it. Mine only reads the negative signal.
Thanks
Vehicle Specs:
94 4runner
AT/ 4X4
3VZE
Thanks
Vehicle Specs:
94 4runner
AT/ 4X4
3VZE
07-23-2009, 12:20 PM
#4
Contributing Member
Yeah I would think that a knock sensor would be basically an "on/off" switch
it's either nocking, or it's not, lol
the typical and easy way to test is to start the motor, put a timing light on it, and while watching the timing close, lighty tap on the engine block with a hammer. the sensor should pic it up as a knock and retard the timing a little for a sec
at least that'll tell you if it's working if it DOES retard the timing, but if it doesn't, then the search begins
could be the sensor itself, ot ir could be wiring...
it's either nocking, or it's not, lol
the typical and easy way to test is to start the motor, put a timing light on it, and while watching the timing close, lighty tap on the engine block with a hammer. the sensor should pic it up as a knock and retard the timing a little for a sec
at least that'll tell you if it's working if it DOES retard the timing, but if it doesn't, then the search begins
could be the sensor itself, ot ir could be wiring...
Last edited by iamsuperbleeder; 07-23-2009 at 12:22 PM.
07-24-2009, 05:03 AM
#5
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It's almost ALWAYS the pigtail wire that runs to the knock sensor. It runs under the intake manifold, so you'll have to remove the entire plenum & manifold.
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