I wonder if there's a problem in the EDS module itself, like a 5v reference power supply is dead?
It's also possible one of the sensors is shorted out, dragging a reference voltage rail down?
It doesn't seem possible to me that the cluster in the tach could work, yet the EDS computer can't read engine speed.
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket
Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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