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Re: No Communciation
Posted to Technical Discussion Forum on 8/15/2018 4 Replies

OK. The TX line (transmit) is 5 volts that comes out of the scan tool and is pulled low by the ECM to communicate.

The RX ( receive) line is 5 volts that comes out of the ECM and the scan tool pulls it low to communicate.

I have seen many PCM failures on gas... Login to read more.

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