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International Automotive Technicians Network
Re: 1998 Peterbilt 320 Low Power
Posted to HD/Fleet Forum on 3/27/2018

The road speed data pid shows Zero. And even though this thing just crawls, it is not going zero. Rpm pid tops out at 1497rpm. The ground speed signal will come from the the speed transmitter on the trans. That will be at the back of the trans. Trans ECU sends... Login to read more.