I have a 2002 venture. I have power to the obd port but I have tried 3 different scanners and can't get a signal. any ideas?

 

Power should always be there leaving the question...did you put the key in and at least turn it to position 2?

First thing I'd do is pull the connector down and make sure it's clean and none of the wires broke off the back side. Beyond that you'll need a schematic to know where the wire comes from.

 

Tried all of that.

 

Doing this from memory but should be close enough...pins 4 & 5 are ground and 16 is power leaving pin 2 as the comm signal. That wire should go to a splice pack where it connects to all the different systems. It is more likely that one of the systems is locking up the bus than all the systems being dead although most scanners only communicate with 3 of the systems (engine, ABS & SRS). You could try pulling the wires off the splice pack, turn the key to position 2 and measure the voltage on each wire but that won't necessarily be difinitive. An oscilloscope would be better if you have one, that will actually show data if a line is active but it still may be hard to tell the difference between a shorted line and an inactive line.

Speaking of scanners, do any of the ones you have do ABS or SRS?

 

is a fuse.. usually cigarette lighter or dome light, is shared w obd 2 port, check all fuses on passenger door side, i fix the same problem.

 

Neither

 

Not a fuse checked them and everything else works.the one port has lost to it.

 

How about we go back to the beginning...

Does it start and run? This alone eliminates a lot of possibilities.

 

Runs fine. No codes just like to use the torque app when traveling.the port was working a few weeks ago.

 

so the scan tool powers up but will not communicate or will not power up? all 3 scanners are working in other obd II vehicles?