OBD2 Communication Issues

[Mike07SE]

Long story short, my OBD2 diagnostic plug got damaged and I bought a new housing to replace it. I unpinned the wiring from the old connector and redid everything verbatim to the new. I did make one bonehead mistake in that I did not disconnect the battery or remove the OBD fuse in my haste. As a result I did create a short removing a pin(s) as I saw a small short and as a result I also had popped the OBD fuse.

After I wrapped everything up and replaced the fuse I proceeded to run a test. I have a BlueDriver module that has worked without fail and another brand that I leave in at times to run my Torque Pro app. Both had power and would connect via the Bluetooth, but could not get communication with the truck and would eventually time out. I'm worried that I've shorted something upstream (ECM????) or possibly have a wire out of place even though I took multiple pictures before hand as well as a plug on hand from the junkyard with cut wires attached for reference.

I want to start by testing pins 6 & 14 (solid pink & purple wires, right?) which are the CAN High & CAN Low lines. I believe I should read 2.5V & 50 - 70 O value for them to be good? Can that be verified? Not sure what the standard test plan would be in this scenario.

[MENTION=66389]BlackWorksInc[/MENTION] - Do you have any thoughts / input?

 

[AuSeeker]

Have you tried disconnecting the battery and reconnecting it to reset the ECM?

Also are you sure the junkyard example you have for reference is from the same year and model as your T4R, the model may or may not matter but the year will to some degree?

 

[Mike07SE]

Have you tried disconnecting the battery and reconnecting it to reset the ECM?

Also are you sure the junkyard example you have for reference is from the same year and model as your T4R, the model may or may not matter but the year will to some degree?

I'll try the disconnect and see if it remedies. Logically it doesn't make sense as the fuse should have stopped any further issues and CAN lines are by design supposed to survive shorts.

The plug came from an 06 and there was only one additional wire that was on my harness vs my sample. The BLK/WHT wire in the picture. But otherwise they matched up before I went into disassembly mode.

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[Mike07SE]

Well I think I solved my own problem as it being a loose contact. If I press down on the OBD2 box the connection resolves real quick. If I take my finger pressure off of it it looses connection.

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