Obd2 link error

[Schurkey]

1. Does that code reader work on any other vehicles?
2. You have power at the OBD2 connector on the vehicle. Do you have a working ground pin there? Missing/broken ground straps in the engine compartment are unlikely to cause the code reader to not connect to the computer.
3. Despite saying "Scan Tool" on the front, that's NOT a real scan tool. It's a code-reader with very limited functionality.
4. Just because the "Check Engine" light is on, does not mean the computer can't be faulty.

 

[k1500 97]

Really. Ok. I took it to auto zone for there scan test still wouldnt connect. Idk truck dosent run bad even if i unhook say egr dosent effect it o2 dosent effect it i drove the truck 2 months not knowing the o2 sensor was unhooked until i tried to fix my exaust.

 

[Schurkey]

You need to verify ground at the vehicle's connector.

You need to verify the wires between the connector and the computer aren't broken, cut, grounded, etc.

One way or another, you need to get communication between a scan tool and your truck's computer. And then be prepared for a heap of codes, and goofy sensor readings.

 

[k1500 97]

Ok so fixed all grounds verified power and ground has both just won't connect. I haven't got into tracing wires. If some one has a diagram I would appreciate it. And can I splice in a new port near the ecm. Bypassing all wires through the firewall.

 

[fancyTBI]

Ok so fixed all grounds verified power and ground has both just won't connect

Does it work on other vehicles? You said it has power and grounds - is this at the OBD2 port?

 

[k1500 97]

Does it work on other vehicles? You said it has power and grounds - is this at the OBD2 port?

Yes and yes

 

[fancyTBI]

I believe there are wiring diagrams in this thread.

88-98 Service Manuals

Over the years I have collected a bunch of GM service literature. Links to PDF Scans of service and STG manuals and a links to the Parts manuals. You'll need the FREE Adobe Acrobat reader to open these files. Get it directly from Adobe here {http://get.adobe.com/reader/} If you're not...

www.gmt400.com

Don’t you have another GMT400 that’s OBD2? Your dads or something? Does the scanner work on his? I’ve never had luck with the cheap scanners.

 

[k1500 97]

I believe there are wiring diagrams in this thread.

88-98 Service Manuals

Over the years I have collected a bunch of GM service literature. Links to PDF Scans of service and STG manuals and a links to the Parts manuals. You'll need the FREE Adobe Acrobat reader to open these files. Get it directly from Adobe here {http://get.adobe.com/reader/} If you're not...

www.gmt400.com

Don’t you have another GMT400 that’s OBD2? Your dads or something? Does the scanner work on his? I’ve never had luck with the cheap scanners

No my Dada is 95 old 1. But we hooked up a good scanner and it still didn't link.

 

[grampadirt]

In your first post you said you were trying to connect to an OBDII system,now you're saying OBDI,which is it?

 

[Schurkey]

My 1997 k1500 obd2 wont connect.

No my Dada is 95 old 1. But we hooked up a good scanner and it still didn't link.

In your first post you said you were trying to connect to an OBDII system,now you're saying OBDI,which is it?

He's saying his dad's truck is OBD1. The one giving him problems is OBD2.