Join Date: Feb 2005
Location: Atlanta, GA
My Ride: CSX/CS/GLHS
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Re: 2006 PT Cruiser, won't display ODBII codes
I have an aftermarket Innova 3100j scanner and a FSM. I am working down the list of steps for diagnostics of the CAN initially. It seems/I know that if any of the modules on the bus has lost its ground or is shorted, it brings the entire bus down. Unplugging modules one at a time will sometimes bring the bus alive again where you can then scan for codes. So initially I am checking to determine the bus has the proper 60 ohms of termination and a good solid ground and power at each module, as well as at the diagnostics connector.
Apparently the instrument cluster displaying that the transmission is n all gears at the same time and the ABS light being on and the check engine light being on is an indication that the cluster is not communicating with the bus, not necessarily that I have trouble with all those symptoms. So it's possible if not likely that if I unplug the offending module(s) some of the problems will go away, or at least I should be able to then read codes. Right now I have to get the CAN Bus interface functioning first to be able to do that.
The CAN interface has two voltages, a high voltage and a low voltage, and there is a ground. If I can confirm that I have high & low and ground at each module as well as at the diag connector, then I have a module bringing down the CAN bus, one of them will be shorted to ground or allow the buss to come back if unplugged.
Working on it....