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International Automotive Technicians Network
Re: Signal return and 'low reference' circuit testing
Posted to Technical Theory Forum on 7/14/2023

Hi Neil,

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If you connect two AAA cells to the common and signal wires on the ECM side you will probably observe a 67% (3V/4.5V) value with a scan tool for that sensor. Get a dual AAA battery holder ... Login to read more.