No communication OBD2?

Okay here is an update. I am pretty sure the OBD port is disconnected somewhere on the way to the computer. On the bright side I found the EEC-IV data link connector in the engine compartment and jumped the (T/O) wire for circuit 914 and the (PK/LB) wire for circuit 915 to pins 2 and 10 on the OBD port. One reads five volts and the other 0.27v. I still got no communication is this because pin 5 is not grounded? If so does it need to be grounded to a wire coming from the ECM or is the chassis fine?

Okay, so I now have every wire on the OBD-2 port jumped to their matching colors on the ECM and seem to have all correct voltage a resistant readings no shorts detected, but I still get no communication. I now again tried changing ECM's still nothing. Also let it be known I am using an Innova 3100 diagnostic tool.

I just tested it on my 2009 Ford focus and no problem communicating. Do circuits 914 and 915 have to connect to anything other then the PCM to get a reading. As I said before they did not seem to get a connection into the cab to the odb port so I jumped the wire directly to the PCM. So maybe it is not connected to some other device in those circuits. Also, this van also has four wheel ABS system and the ABS light has been on and I cannot communicate with that control module either.

Yes 4, 5 are grounded 16 has 12v and 2 has 5v and 10 has 0.27v and 13 has 0v.

I have tried a used PCM and got the same results

I don't know if that is the right diagram I have a 104 pin PCM

Scanner will not link with vehicle. Tested OBD II connector and do not have ground at pin 5 (signal ground). Can this be grounded or does this ground through the PCM? (PCM just replaced with a cardone re-manufactured unit)

I have a 1996 Ford E350. It surges while driving and at idle. The check engine light is not registering a problem and it comes on before you start the engine as it should then goes out after starting the engine. I have an OBD II scan tool but it gets a link error and will not read any codes or any other info. I have also unplugged the O2 sensor but the check engine light still wont come on to indicate an issue. Is the PCM faulty? Where is the PCM located?

To address the PCM check engine light issue; without some testing, it would be difficult to know for sure. I suspect that the PCM may be operating normally. We occasionally run into a scan tool that will not read codes properly on this model for some reason. Rarely does throwing a PCM at a vehicle work. I heard a stat that it is successful less than 3% of the time, so I would not suggest doing that. The fact that the check engine light proves out usually is a good sign that the PCM is working. Sometimes they do not turn on a light unless the vehicle is driven for a while and the key is cycled a few times while the fault (or unplugged O2)is active. I would focus on a lean fuel mixture issue. It may be actual- a vacuum leak or it may be a faulty input- a faulty baro sensor. These engines have been known to have intake manifold vacuum leaks. A somewhat risky, but proven method is to run the engine while the symptoms occurs while running propane gas (unlit)with a hose around the intake manifold gaskets. If the engine smoothes out, then you may be on to something. I hope this helps.

Thanks for the tip. I'll check it out

You welcome.