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the good news is that for simplicity and cost-savings, most manufactures only implement a single network type during certain year ranges.

since they have to use one of the standard OBD-II protocols for the diagnostic bus, they might as well use the same protocol (or a slight variation) on the other buses.

vehicles usually have at least 2 buses, the main diagnostic bus and an interior or comfort bus.

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if we don’t have this info, we can still try connecting to the diagnostic bus and hope it relays from our target bus.

the OBD-II spec allows for the following protocols: SAE J1850 PWM, SAE J1850 VPW, ISO 9141-2, ISO 14230-4 KWP, ISO 15765-4 CAN, SAE J1939 CAN.

maybe you want to install your own car-puter that will replace the radio and climate controls.

depending on your end goal, a microcontroller could be the best approach.

the OBD regulations were put in place by the EPA for monitoring emissions related components, but the systems have evolved to be much more capable.

the good thing about OBD-II was it defined a limited set of network types that a car maker could implement for the emissions related diagnostics.

however, this article is about getting started quickly and cheaply by leveraging a standard ELM327-based OBD-II scan tool (~) and your laptop, tablet, phone, Raspberry Pi, etc.

note: we’re not talking about “pulling codes” or clearing the check engine light, that’s everyday stuff.

this is why we are sometimes able to use a scan-tool to interface with a non-OBD bus.

from a high level, we need to: now onto those details…

the FSM cleared up which one was the native protocol for the “Chrysler PCI Bus” (SAE J1850 VPW).

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