Obd2 port not connecting to scanner
Obd2 port not connecting to scanner Tried plugging In a normal obd2 scanner to see if it works and it doesn’t. Car is an 02 z28 with an f body harness and pcm
obd port has power
wires have been checked from pcm to port
Scanner isn’t bad, works in my other vehicles
pcm has been replaced as of last year
car starts but runs super rich. Needs a tune though badly since I got bigger injectors for it
all the pins seem to be fine as well
Ive tried unplugging connectors and plugging them back in
all fuses are fine and were replaced anyways
cig fuse is fine
so basically I’m at a loss. Pcm is getting checked today but I highly doubt it’s that...
does anyone have any idea ??
im suppose to be getting a Dyno tune Friday.. and the port is needed for tuning obviously.
obd port has power
wires have been checked from pcm to port
Scanner isn’t bad, works in my other vehicles
pcm has been replaced as of last year
car starts but runs super rich. Needs a tune though badly since I got bigger injectors for it
all the pins seem to be fine as well
Ive tried unplugging connectors and plugging them back in
all fuses are fine and were replaced anyways
cig fuse is fine
so basically I’m at a loss. Pcm is getting checked today but I highly doubt it’s that...
does anyone have any idea ??
im suppose to be getting a Dyno tune Friday.. and the port is needed for tuning obviously.
My car has an 06 6.0 lq4 swap. Along with a th400. Center counsel was removed and all that maybe I cut a ground wire ? But if I did the port wouldn’t have power so it rules that out . That’s why I don’t get it, scanner powers up, tries to connect and about half way through it said it can’t connect.
Last edited by Bosshog; Apr 12, 2021 at 09:04 AM.
Staging Lane
Joined: Feb 2016
Posts: 70
Likes: 6
What are your other vehicles? Do you have another older GM you can try the tool on? Be aware the older GM's communicate with the J1850VPW (aka Class 2) protocol, on DLC Pin 2. This architecture has been obsolete since roughly 2005, and newer CAN-based vehicles communicate using high speed data on pins 6 and 14. I have come across some scan tools that are missing the circuitry to communicate with older vehicles. It will power up, but that's about it. If you measure voltage at pin 2, and you have roughly 7 volts.....its not your car, it's the tool.
What are your other vehicles? Do you have another older GM you can try the tool on? Be aware the older GM's communicate with the J1850VPW (aka Class 2) protocol, on DLC Pin 2. This architecture has been obsolete since roughly 2005, and newer CAN-based vehicles communicate using high speed data on pins 6 and 14. I have come across some scan tools that are missing the circuitry to communicate with older vehicles. It will power up, but that's about it. If you measure voltage at pin 2, and you have roughly 7 volts.....its not your car, it's the tool.
Staging Lane
Joined: Feb 2016
Posts: 70
Likes: 6
If that is the case I am wondering if you nicked the splice pack under the dash. It's taped (sort of) to the bracketry at the front of the console. All the Class 2 bus devices go to that splice pack for ease of diagnosis. The idea behind it is you can take the plug out and communicate with each individual module by jumping the pins. Does everything else work properly (cluster, ABS, airbag, etc)? They all tie in there too.
If that is the case I am wondering if you nicked the splice pack under the dash. It's taped (sort of) to the bracketry at the front of the console. All the Class 2 bus devices go to that splice pack for ease of diagnosis. The idea behind it is you can take the plug out and communicate with each individual module by jumping the pins. Does everything else work properly (cluster, ABS, airbag, etc)? They all tie in there too.
If that is the case I am wondering if you nicked the splice pack under the dash. It's taped (sort of) to the bracketry at the front of the console. All the Class 2 bus devices go to that splice pack for ease of diagnosis. The idea behind it is you can take the plug out and communicate with each individual module by jumping the pins. Does everything else work properly (cluster, ABS, airbag, etc)? They all tie in there too.
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Well as of right now I have no idea what the problems is. I’ve checked/tried everything I’ve been told to try. Usually I’d say screw it but my tuner has no way of hooking up to my pcm to make changes while tuning if I can’t figure this out. Unless he removes my pcm every time he has to make a change in the tune in the dyno... lol
what is confusing to me though is that my car is set up exactly (wiring wise) how it was last year, which is confusing to me on why it won’t read.. this has been the biggest pita
