Is my OBDII port wired right?

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May 8, 2010 | 07:12 PM

markeheiden

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Is my OBDII port wired right?

Just wired my 78' Jeep with 2007 LC9 harness and PCM. The car does not run, it starts but shuts right off (see other thread).
The MIL light comes on but the OBDII scanner comes on and beeps, displays "READ" but does not continue to reading the codes?

I have it wired as such:

Pin 4 and 5 -ground
Pin 16 - B+ unswitched
Pin 6 - ISO 15765-4 CAN High (tan #2500 to PCM)
Pin 14 - ISO 15765-4 CAN Low (tan/blk #2501 to PCM)

Any confirmation out there?

May 9, 2010 | 02:08 PM

cam

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Scroll down about 3/4 through the first post in this thread

https://ls1tech.com/forums/conversio...swap-faqs.html

May 9, 2010 | 02:29 PM

SUCK MY SS

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From: 626 to the 818

have you had the VATS disabled in the PCM?

May 9, 2010 | 06:31 PM

markeheiden

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My programmer says he did disable them. I know nothing about the process. Is it possible there are multiple VATS parameters and he missed one or is it one line item like "disable VATS" ?

May 9, 2010 | 06:37 PM

markeheiden

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"Scroll down about 3/4 through the first post in this thread"

Excellent thread but a 2007 is not the same as a 99'. I was told there are two data lines called ISO instead of one as listed on the 99'.

May 10, 2010 | 12:16 PM

cam

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Hmm thats interesting. Well if its any consolation Im about to do up a custom L92 harness so I'll be able to let you know for sure if its different or not but Im still a week or two away from harness building.

May 10, 2010 | 04:14 PM

markeheiden

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Staging Lane

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I have the data lines (pin 6 and 14) connected to pin 27 and 28 of the ECM per attached schematic.

Attached Files

ECM connector.doc (55.5 KB, 108 views)

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May 13, 2010 | 12:17 PM

markeheiden

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Staging Lane

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Where does one go if no one here has an answer?

I don't think GM is setup to take technical questions from owners.

May 13, 2010 | 12:36 PM

#10

cam

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Try posting in the conversions/hybrids section you will likely have better luck there as guys hanging out in there will be more knowledgeable on wiring. Failing that post up in this thread linked below these guys did up their own harness and might be willing to help you out

https://ls1tech.com/forums/conversio...d-formula.html