Quote:
Originally Posted by houtan
I have been studying this thread to learn how to troubleshoot my issue. One of the few threads that actually diagnoses an issue from start to finish. https://www.e90post.com/forums/showthread.php?t=2121740
I was able to pull the PT CAN wiring diagram using ISTA.
1. Do I test these wires at the connector for each module? Are the tests done with the connectors plugged in or removed from the module?
2. Am I looking for voltage, ohms, something else? One data point I can't find is the normal values for the tests. Is that information also in ISTA?
3. Do I need an oscilloscope?
In the meantime, I am going to get my car in the air and start removing panels to do visual inspections where possible. There is a location identified in the thread I linked which points to the wheel well that I want to look at just to rule it out.
|
I tested with the connectors detached and putting a tiny wire into the connector, my probes weren’t small enough to slide next to the wires themselves.
Checked for voltages to confirm power to modules and then ohms to confirm the pt-can loop didn’t have a break.
Since you’re seeing 60ohms at the OBD then the DSC and EKMS seem to both have solid wiring up to that. Each one has a 120ohm resistor, in parallel goes to 60ohm.
An oscilloscope would definitely help see if there is noise on the bus. Dont fully know how to use them so can’t advise on that.