jmule

While troubleshooting a traction control issue. I found out that the ss does not include a power steering position sensor as an input to the EBCM. There is not even a 5v reference line for the sensor. I am using Alldata as my wiring diagram source. So, if anyone is also using that, be aware that some of the diagrams are wrong for the ss.

donbrew

Usually the traction control problems are in the wheel speed sensors or their connections.
If anybody has messed with your steering wheel or steering column; the PSCM may need to be calibrated.
The yaw sensor may have a bad connection or be broken.
Possible the EBCM needs replacing.

My AllData has one diagram that includes wires for LNF and -LNF. On the connector pinout it does show 2 5 volt refs and 2 low refs for steering angle sensor. You may not be seeing the GMLAN connection

jmule

Ok. I must have this diagram, but it is in a different location somewhere. It confirms that there is not supposed to be a steering position sensor. I don't have an ABS warning light and ABS appears to be working ok. My OBD interface needs to be upgraded to one that has SW CAN. So, I am working without knowing what code is set. But, I will buzz it out and find out what's going on with it.

donbrew

Does that mean you are needing a CANDI module?

IIRC, the SS PSCM is different from the LS/LT. I think it has a torque sensor in it.

I would check all of the wires to the EBCM and all of the pins. There have been a couple of people that had to replace the EBCM.

jmule

Yes. Even though the SW CAN bus is not physically connected to the EBCM, it must use the body computer to configure the high speed bus so that the ECBM can be seen on the HS bus. I am using an ELM327 interface, which does not have access to the SW CAN. I plan to check all the wiring tomorrow.