constant knock count of 9, no matter what
#16
A constant knock count of 9 means the knock sensor is disconnected or defective.
Based on what you have said you tried I would guess there is probably a disconnect somewhere between the knock sensor plug and the ecu plug. Playing with the knock sensitivity tables won't help.
Based on what you have said you tried I would guess there is probably a disconnect somewhere between the knock sensor plug and the ecu plug. Playing with the knock sensitivity tables won't help.
crazy that it doesn't throw a check engine code with a bad sensor, just like any other sensor. that would have saved a lot of hassle, instead of just defaulting knock to 9.
thanks for all the feedback.
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Update just in case he doesn't get back in here right away. They tried a 3rd sensor and all seems to be normal again... I guess never assume! Also if you want to bypass the factory wiring harness the Knock sensor is calibrated to work with a certain wire length and wire resistance so it's not as easy to just replace the circuit as I would have imagined.
#18
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Update just in case he doesn't get back in here right away. They tried a 3rd sensor and all seems to be normal again... I guess never assume! Also if you want to bypass the factory wiring harness the Knock sensor is calibrated to work with a certain wire length and wire resistance so it's not as easy to just replace the circuit as I would have imagined.
and V=IR
so if you mess with the wire length, you are messing with the "R", which changes the V...
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Since I am battling this issue right now, you wouldn't happen to know the factory ohm reading of the resistance? I cut both wires, and ran them through mil-spec plugs, and I would like to check the wiring resistance.
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I'm no electrician, but I checked my harness with the multimeter set at 200 and I get 2.8 for both wires. I get 2.7 when I touch the probes together (so I don't know if that means there is a .1 resistance on the wires?)
I'm about to do my Mil.Spec connector. Would keeping the wires the same length work or another alternative connector through the firewall for the shielded wires? Looks like there are 3 shielded wires from the ECU (2 go through the firewall), Knock sensor, front o2 and rear o2 (doesn't go through firewall, so no need to cut and most bypass this for WB anyway).
Last edited by 10isace; Sep 23, 2014 at 07:59 AM.
#23
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What resistance are you getting?
I'm no electrician, but I checked my harness with the multimeter set at 200 and I get 2.8 for both wires. I get 2.7 when I touch the probes together (so I don't know if that means there is a .1 resistance on the wires?)
I'm about to do my Mil.Spec connector. Would keeping the wires the same length work or another alternative connector through the firewall for the shielded wires? Looks like there are 3 shielded wires from the ECU (2 go through the firewall), Knock sensor, front o2 and rear o2 (doesn't go through firewall, so no need to cut and most bypass this for WB anyway).
I'm no electrician, but I checked my harness with the multimeter set at 200 and I get 2.8 for both wires. I get 2.7 when I touch the probes together (so I don't know if that means there is a .1 resistance on the wires?)
I'm about to do my Mil.Spec connector. Would keeping the wires the same length work or another alternative connector through the firewall for the shielded wires? Looks like there are 3 shielded wires from the ECU (2 go through the firewall), Knock sensor, front o2 and rear o2 (doesn't go through firewall, so no need to cut and most bypass this for WB anyway).
#24
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do you have any pic of your setup? i'm having some real trouble with mine also, giving me a CEL cause of the knock sensor misfunctioning! ( previous owner did a buch of wiring for an alarm system and now that i removed it, it seems that it ****ed it up )
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