Hi,
My 2000 Cherokee failed emissions because they couldn't get a reading. I have confirmed I have power (14v) on pin 16, and my grounds (pins 4/5) are good. I have also verified continuity from DLC pins 6/7 back to the PCM, so the wires are OK. It drives fine. There is no CEL on.
I can read voltage on pins 6/7. I understand this is probably some digital signal, but I was wondering just to make sure I am in the ballpark if someone might know what these values should approximately be (as read on a multimeter) on a functional system?
Is it likely that only the OBD component of the PCM has stopped working? I read one other post where someone claimed a new battery fixed this, but with a steady 14V reading, I am not confident this is my issue.
Thanks,
Kevin
My 2000 Cherokee failed emissions because they couldn't get a reading. I have confirmed I have power (14v) on pin 16, and my grounds (pins 4/5) are good. I have also verified continuity from DLC pins 6/7 back to the PCM, so the wires are OK. It drives fine. There is no CEL on.
I can read voltage on pins 6/7. I understand this is probably some digital signal, but I was wondering just to make sure I am in the ballpark if someone might know what these values should approximately be (as read on a multimeter) on a functional system?
Is it likely that only the OBD component of the PCM has stopped working? I read one other post where someone claimed a new battery fixed this, but with a steady 14V reading, I am not confident this is my issue.
Thanks,
Kevin