Yesterday and today I demonstrated to myself that the TPS signal, when measured at pin 50 of the 80C166 cpu chip in the DME, is stable and doesn’t drop out. If the TPS or the wires were faulty, I would expect my DMM to store a minimum value lower than the zero-throttle value. So I’m pretty certain the ADC in the 80C166 is producing faulty data. (the throttle-closed DC voltage is 0.750 ±0.002V)
I suppose the DME needs the VIN number programmed into it???
The timing vs load vs RPM table, vanos table, and injector table have to match my engine.
If I get a stock DME from a car that had the same engine, does anything need to be reprogrammed?
Who does the reprogramming? Can a local independent shop do it?
It might be easier for me to just replace the suspect CPU chip since all the data resides in an E-PROM (the square j-lead chip). The boot image file may reside in that same memory or in a flash memory.