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Re: 'Most' Onoard Computer Sensors Use 5-volt Reference--Why 5?
Posted to Technical Theory Forum on 11/8/2003

Ford reckognized a need to use a voltage that was below the minimum voltage during engine cranking. The settled on a 9.0 volt refference voltage for there late 1970s EECI system. This carried over to EECII and EEC III.

What Ford ignored was that an industry ... Login to read more.