What should the voltage be on a Class 2 serial pin?
What should the voltage be on a Class 2 serial pin? With the Ignition on, the voltage on class 2 serial data pin should be 5V or fluctuating between 3.5V and 5.0V, If open, PCM cannot transmit data to the scan tool. Connect positive DMM lead to DLC Battery + terminal Connect negative DMM lead to battery ground terminal How to check J1939 datalink resistance across pins C and D? Quick Test #1: Check the J1939 datalink resistance across pins C and D at the diagnostic connector. Result Possible Cause 60 Ω ± 6 Ω The datalink backbone is intact...