laurieb said:
So, on a 94 or 95, there will be all OBD1 codes available and only some OBD2 codes? Is that correct? To pull the codes, the pin-out would be different, since the 16 pin connector is used, but basically you could still short the proper pins for that connector to get the OBD1 codes? And, with proper software, you could get both OBD1 as well as limited OBD2 codes?
Yes. Only the corresponding OBD II codes to the OBD I system are available.
Yes. You can retrieve the OBD I codes via the CEL just like the 85 using a "paperclip".
Yes. Tthe pinouts are different.
The really cool feature of the 95 is the ability to use the speedo readout and the trip / fuel buttons to query and retrieve the diagnostic codes for ECM, BCM, TCS, ABS, and Suspension (called "modules"). You can also cycle / monitor the inputs / outputs for the BCM. The onboard diagnostics in the 95, using the speedo as the display are very powerful and useful. Teach yourself more about them.