obd1 vs. obd2
#3
The basic logic for fuel and ignition control is similar when comparing the LT1 OBD-I to OBD-II PCM's. The main difference is the fact that they added a few sensors (crank position, after-cat O2's, EVAP vacuum switch) and a lot more diagnostic checks, all of which are aimed almost exclusively at emissions. The diagnostics typically have little, if anything to do with fuel and ignition control. There was some modification of the A4 control logic, which appears to overcome problems with high stall converters that were in the OBD-I system.
Last edited by Injuneer; 09-02-2007 at 03:38 PM.
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