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Blacky
October 15th, 2005, 01:43 AM
New EFILive document showing how to wire bench harnesses for 1999+ and 1998 PCMs is now available here:
http://www.efilive.com/doc/Tutorials/Bench%20Harness%20Tutorial.pdf

Paul
SS2win
October 15th, 2005, 06:56 AM
so thats all it takes to program on the bench? cool.
TAQuickness
October 15th, 2005, 10:20 AM
sweet! now I can blow stuff up on my bench!
GMPX
October 15th, 2005, 10:27 AM
No, that's my job, though I must admit, I haven't smoked one yet.

Cheers,
Ross
kbracing96
October 15th, 2005, 01:33 PM
OK, now for the $100 question, where can I find plugs for the pcm and obd2 port to make a bench harness?
bK
October 16th, 2005, 04:39 PM
Can you have a harness connector directly wired into a db9? This would bypass the OBDII connector all together.
mistermike
October 17th, 2005, 01:10 AM
No, that's my job, though I must admit, I haven't smoked one yet.

Cheers,
Ross
I tried to, but it's too big for my bong.
Blacky
October 17th, 2005, 11:54 AM
Can you have a harness connector directly wired into a db9? This would bypass the OBDII connector all together.

Yes - good idea, I will add that into the diagram.
Paul
joecar
October 17th, 2005, 12:10 PM
Yes, where can we purchase the pcm connectors from...?
Blacky
October 17th, 2005, 01:19 PM
Yes, where can we purchase the pcm connectors from...?

No idea, all of ours come from old wiring looms.
Paul
Blacky
October 17th, 2005, 01:19 PM
Can you have a harness connector directly wired into a db9? This would bypass the OBDII connector all together.

Yes - good idea, I will add that into the diagram.
Paul

Document has been updated with 9-pin D-connectors.

Regards
Paul
BigTex
October 18th, 2005, 05:13 AM
In the past, every tune I made with LS1edit on my truck needed a benchtop harness. I made my own using a spare wire harness a couple of years back. I skipped the OBD2 connection and went right to DB9 which worked fine.


The two PCM connectors (blue and red) are keyed so they only fit in one way on the PCM. Typically you use the blue one to build the harness and toss out the red one. If you cut off the plastic keys from the red one it will fit in either side of the PCM, so you can use that connector to build a second harness. Just remember which side its supposed to go in.


When bench tuning my truck, I've always left the PCM installed with the second harness connector attached. I just remove the blue connector and get power from the vehicles battery.
kewlklown
April 28th, 2015, 09:19 AM
Yes, where can we purchase the pcm connectors from...?

I know this an old thread, but Obd2 connectors available at mouser.com
18316
joecar
April 28th, 2015, 04:51 PM
I know this an old thread, but Obd2 connectors available at mouser.com
18316Yes, we have found a bunch of various connectors at mouser.com.