Even with a PL2303 chipset it should be no problem to diagnose the MS CANbus network. The only problem of the PL2303 chipset may be the maximum Baudrate (some chipsets do and some chipsets do not support the higher Baudrates that are necessary for some functons of the ELMconfig program).
Did you rewire the ELM327 interface correctly? There should be pin numbers on the OBD connector of the ELM327 interface. It is a pretty common fault that people mirror the connector pins and rewire the wrong pins.
If the ELM327 interface is rewired correctly it should technically be able to diagnose the MS CANbus network without any problems. After rewiring the ELM327 interface must be set up for the MS CANbus network. This can be done manually or with ELMconfig.
After the ELMconfig software is openened you have to select "Adapter setup" and next "Setup Adapter for MS-CAN bus". You only have to do this once. After the ELM327 interface is setup for the MS CANbus network it should work without any problem.
thank you Wilco for the quick replay.
you are right i wasnot setup adapter for ms-can bus. i had select auto select and i thought that i have to do nothing more.
the speed test was not working except if i select 9600 baudrate.
the max speed that my chip support is 256.000 and that baudrate i select for the constant speed.
Now the speed test is working only if i select the 256.000 baudrate and i can read and write to HS-CAN and also to MS-CAN
can i read and write the pcm module with that speed or i have to buy another elm327 which support 500.000
thank again wilco