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ej22t knock sensor?
Posted: Mon Apr 19, 2010 1:33 am
by ej22tImpreza
B56.4 Knock sensor (shield)
B56.5 Knock sensor (signal)
are these two wires spliced together when they get to the knock sensor?
Re: ej22t knock sensor?
Posted: Mon Apr 19, 2010 2:22 am
by Legacy777
The signal wire is surrounded by the shield wire.
Re: ej22t knock sensor?
Posted: Mon Apr 19, 2010 5:25 am
by ej22tImpreza
should the wires conect at all?
Re: ej22t knock sensor?
Posted: Mon Apr 19, 2010 2:47 pm
by BSOD2600
Re: ej22t knock sensor?
Posted: Mon Apr 19, 2010 3:59 pm
by ej22tImpreza
^^^^ This = only slightly helpful.
Again......Should the signal wire and the shield wire connect at all?
Re: ej22t knock sensor?
Posted: Mon Apr 19, 2010 5:48 pm
by Legacy777
No they should not connect at all.
The shield wire on the wire coming from the ECU is grounded at the ECU. The shield wire on the wire coming from the knock sensor is grounded at the knock sensor.
Re: ej22t knock sensor?
Posted: Tue Apr 20, 2010 12:59 am
by ej22tImpreza
Ok thank you guys very much....
so the question now is how bad is it if they just so happen to touch?
and what dose the shield wire connect to ?
Re: ej22t knock sensor?
Posted: Tue Apr 20, 2010 3:54 am
by ej22tImpreza
bump for help?
Re: ej22t knock sensor?
Posted: Tue Apr 20, 2010 4:35 am
by BSOD2600
touching is bad, as the FSM states from above. Shield wire connects to the ECU -- that's it.
Re: ej22t knock sensor?
Posted: Tue Apr 20, 2010 6:54 am
by ej22tImpreza
how is touching bad?
Re: ej22t knock sensor?
Posted: Tue Apr 20, 2010 5:50 pm
by Legacy777
The shield wire is there to provide shielding from electromagnetic interference (EMF). The voltage output on the knock sensor is very small, so any interference can affect the signal going to the ECU. If the shielding is damaged, or touches the signal wire, that will likely short the signal wire out causing problems with the knock sensor.
