1994-1995 ODBII Port - MustangForums.com



5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
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Old 09-28-2015, 11:51 AM   #1
Urambo Tauro
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Default 1994-1995 ODBII Port

To pull codes on 1994 and 1995 5.0 models, you have to plug into the EEC-IV port under the hood.

But what about that inop OBD-II port under the dash? What's at the other end of those wires? Does the port connect to anything? Anything at all?
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Old 09-28-2015, 11:37 PM   #2
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not functional......was same harness for v-6 models which were obd 2 compliant....the 5.0 wasn't ever obd-2 in the foxes or 94-95's
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Old 10-03-2015, 07:26 PM   #3
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I'm aware of that. I'm not trying to pull codes.

But this OBDII port is here, and it has some pins in it. There is a small bundle of wires coming out the back that continue running out-of-sight somewhere under the dash. My question is, where do those wires go?

There are only six pins in the connector: 2, 4, 5, 10, 13, and 16. I haven't probed any of them because I'm not sure what I'm getting into here. From what I've been reading, 4 is chassis ground and 16 is 12V+. That sounds like it could be useful.

The other pins seem to be for diagnostics only. 5 is "signal ground". 13 is for PCM programming. 2 and 10 are positive and negative bus lines, respectively. But I don't know if these can communicate with the PCM, or if they are even connected to it.

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Old 10-03-2015, 09:52 PM   #4
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Quote:
Originally Posted by Urambo Tauro View Post
I'm aware of that. I'm not trying to pull codes.

But this OBDII port is here, and it has some pins in it. There is a small bundle of wires coming out the back that continue running out-of-sight somewhere under the dash. My question is, where do those wires go?

There are only six pins in the connector: 2, 4, 5, 10, 13, and 16. I haven't probed any of them because I'm not sure what I'm getting into here. From what I've been reading, 4 is chassis ground and 16 is 12V+. That sounds like it could be useful.

The other pins seem to be for diagnostics only. 5 is "signal ground". 13 is for PCM programming. 2 and 10 are positive and negative bus lines, respectively. But I don't know if these can communicate with the PCM, or if they are even connected to it.
They run into the harness, but are of no use to you. They will not allow you to do anything useful with your PCM. You cannot pull data, you cannot get codes.


You honestly should forget that it's there.
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Old 10-03-2015, 10:15 PM   #5
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You mean they just dead-end in a wire-loom somewhere? Oh well; I'm just asking out of curiosity anyway.

I'm really more interested in pins 4 & 16. If there's 12V power there, it would be nice to use it for accessories like a dashcam or GPS unit. But first, I'd like to know what circuit that would be. If those wires are sharing a circuit with the PCM, I'd rather just leave it alone. I don't want to burden the PCM circuit with an extra load that could pop the fuse.

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Old 10-04-2015, 08:01 PM   #6
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you don't want to use those wires for anything that pulls much amperage
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Old 10-05-2015, 10:37 PM   #7
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I'd rather just leave it alone.
that would be a GREAT idea...
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