I think so, i dont think that any of those wires are twisted or shielded.

George

 

Did this scanner communicate with this engine computer when you first got the truck? Do you have another scanner you can try?

George

 

i never tride to scan it came on a tow truck it did work on my 97 gmc. Sonoma what wire and plug would it be at the computer i will get a list of probs on dash

 

The class 2 data line from the engine computer is dk grn on C4/P11.

George

 

I jumped the wire from just behind the computer dk green to purple on splice pack (that would be like jumping purple to dk green) and no communication the car starts (although it kicks back and then will restart just fine ) and seams to run ok short drive and it shifted fine the bat light is on but gage shows about 12 and jumps to 14 when started also abs security air bag and low fuel light is on i am thinking computer but don't know could a computer cause all this?
thanks john

 

Do you have access to a scope, even a cheap little battery powered one so you can see if there is any data on the class 2 bus from the computer?

George

 

yes would i test it at the back of the computer i striped a small piece about 1/8 but did not cut it
and thanks for all the help
John

 

Follow what the guy does in the video in post #6. If you get nothing even with the comb out after trying all the pins then yes go to the connector at the engine computer and try the dk grn class 2 wire there. Make sure that the truck is running for all of this.


George

 

i got a scope and found a data signal and had a signal on the data bus but no communication to scanner what are the 4 wires to obd2 connector i assume 12v and ground and data is there a data ground also? anyway the engine runs good but it kicks back on first start it will stay running good if you turn it off after it runs even just 10 seconds it starts just fine

 

DLC pins:

2 ppl class 2 data
4 blk ground
5 blk/wht ground
9 tan VIU
13 org transfer case module
16 org +12v

Did you still have class 2 bus data traffic with the com reinserted?


George