obd2 port not working
Thread Starter
Registered User
Joined: Sep 2017
Posts: 4
Likes: 0
obd2 port not working hello .im new to this site. I have built a 69 firebird with a 2010 l/99 camaro engine and a 4l65e trans.. we used a stand alone wire harness supplied by swap specialties..i am having trouble getting a signal from the obd port.. i have checked all my sensors connections ..this is my first ls conversion so i have little knowledge when it comes to tracking down this problem...this is what i have done so far....changed the can wire [ tan /white ] from pin location 6..7..8..9..nothing???? i was told that the signal travels thru the tcm ??? could there be a problem with my tcm??? where do i start to track this problem down...any help would great!!
thanks.............jason
thanks.............jason
Thread Starter
Registered User
Joined: Sep 2017
Posts: 4
Likes: 0
obd2 port not working wow after 100 plus views and knowone has a clue where i should start looking?? i guess my first mistake was purchasing a swap specialties harness.. they have zero customer service...i was hoping someone on this site could give me a hand with this problem...i been building muscle cars for over 30+ years and after hundereds of builds im shure ill figure it out....
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
Likes: 3,616
From: Central Cal.
Dude, you were only on here for 2-1/2 hours before your second post, and in the middle of the night. Be a little more patient. Someone who knows, and will be awake, will give you an answer. Just hang on...
Every time I go to check a vehicle and the obd2 port is dead I check if the cigarette lighter to see if it's working.If they both are out then I check the fuse. Not sure if that helps but.....
Thread Starter
Registered User
Joined: Sep 2017
Posts: 4
Likes: 0
ok i looked up ALDL and most show a purple wire in pin location 2 and a tan in location 9...my is tan/white in location 8 and tan in location 14 with grounds 4/5 and power in 16..my question is ....did the locations and colors change with the gen 4 ecm's...a assume the ALDL plugs i was looking at where late 90's early 2000's....because i dont know what harness this was built from it's hard to say...i think its a modified is1/4l60e...would this make a difference since my combo is ls3/4l65e????????? thanks for any help on this subject!!!! p.s. the the ecm has its own power supply with one wire to key on...but i did check my fuses like 2toeracing suggested...
Trending Topics
OP you need to be using Can+ and Can- This PDF has pin outs for the cab bus on the E38 ECM and and the T42 TCM. Buzz fron the ALDL to the ECM and TCM pins for continuity.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
On The Tree
Joined: Sep 2007
Posts: 196
Likes: 0
Position 4,5 Ground (typically Black
Position 6 Can + (twisted pair typically Tan/Black or Maybe Tan/White in your harness)
Position 14 Can - (Tan)
Position 16 Battery (Orange)
Colors may vary between each harness manufacture. Good luck with it. Make sure you don't have Dakota Digital or anything else plugged into a Y adapter on the Diagnostic Port. That will create interference when using a scan tool. Depending on how the wiring was done the TCM, ECM, and/or diagnostic port could be mis-pinned creating interference as well.
Position 6 Can + (twisted pair typically Tan/Black or Maybe Tan/White in your harness)
Position 14 Can - (Tan)
Position 16 Battery (Orange)
Colors may vary between each harness manufacture. Good luck with it. Make sure you don't have Dakota Digital or anything else plugged into a Y adapter on the Diagnostic Port. That will create interference when using a scan tool. Depending on how the wiring was done the TCM, ECM, and/or diagnostic port could be mis-pinned creating interference as well.