[ischmitz]

Ah - that is very close to the 3.2 Porsche DME. Same Bosch 0127 peak&hold driver scheme for the injectors, likely with a different current sense resistor. Same flywheel decoder and ICV driver and same ignition driver. Just different inputs into the ADC because of the water-cooling and a different chip.

Does the DME show brain activity when you turn the ignition to RUN in the car. The ICV needs to vibrate. If that’s a yes the next step is to find out if the flywheel sensors put the DME into run mode. Check for fuel pulses when cranking or are the fuel injectors wide-open?

For bench testing purposes you need both the speed and reference signals to simulate the flywheel turning and then use an oscilloscope to confirm the 8051 MCU puts out spark and fuel pulses. After that it’s troubleshooting the analog portion to see if the fuel and spark signals are property generated to the outputs.