Toyota Donut knock sensor

[madmonkey]

Hi,

My car is currently at a shop and they need to know which wire is what on a Toyota Donut knock sensor  Here’s a picture of the connector plug. 

Thanks in advance 

[wastegate]

Which car?

Most Toyota's (6 cylinder) run two sensors.

Knock1 usually Black wire to ECU, then other pin to ground.
Knock2 usually White wire to ECU, then other pin to ground.

But some Toyota's use gray instead of white.. 

But Pin 1 on it goes to the ECU.

[madmonkey]

Toyota MR2 SW20 turbo, it was using the stock narrow band knock sensor with 1 pin.

The new one will be running the donut 2 pin with new shielded dual core tefzel straight to the ECU plug. 

I think we might be all good though as the supplier where I got the knock sensor from said it doesn’t matter which pin goes where, as long as 1 is to the knock pin and the other is grounded. Which I assume it should be grounded to sensor ground and the shield from the wire to another sensor ground? 

[wastegate]

Just do what Toyota do.

 

[Adamw]

Just check neither of the pins in the knock sensor have continuity to the metal base, some do.  If it doesnt then polarity doesnt matter.  If one pin does have continuity to the base then this is your ground pin.  

The shield and ground wire can both be connected together at the ecu end.  

[madmonkey]

Thanks Adam, all sorted