ej22t knock sensor?

[ej22tImpreza]

B56.4 Knock sensor (shield)
B56.5 Knock sensor (signal)
are these two wires spliced together when they get to the knock sensor?

[Legacy777]

The signal wire is surrounded by the shield wire.

[ej22tImpreza]

should the wires conect at all?

[BSOD2600]

[ej22tImpreza]

^^^^ This = only slightly helpful.
Again......Should the signal wire and the shield wire connect at all?

[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.

[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 ?

[ej22tImpreza]

bump for help?

[BSOD2600]

touching is bad, as the FSM states from above. Shield wire connects to the ECU -- that's it.

[ej22tImpreza]

how is touching bad?

[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.