madmonkey Posted October 19, 2023 Report Share Posted October 19, 2023 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 Quote Link to comment Share on other sites More sharing options...
wastegate Posted October 19, 2023 Report Share Posted October 19, 2023 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. Quote Link to comment Share on other sites More sharing options...
madmonkey Posted October 19, 2023 Author Report Share Posted October 19, 2023 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? Quote Link to comment Share on other sites More sharing options...
wastegate Posted October 19, 2023 Report Share Posted October 19, 2023 Just do what Toyota do. Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 19, 2023 Report Share Posted October 19, 2023 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. Quote Link to comment Share on other sites More sharing options...
madmonkey Posted October 20, 2023 Author Report Share Posted October 20, 2023 Thanks Adam, all sorted Quote Link to comment Share on other sites More sharing options...
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