MSD80 repair service

30BA DME digital motor electronics, internal failure
30BB DME digital motor electronics, internal failure

The engine cannot be started

The engine works on 2 (N43) or 3 (N53) cylinders:

  • no fuel for the damaged bank (cylinders 1;2;3 or 4;5;6: N53; 1;2 or 3;4: N43);
  • no ignition for the damaged bank.

Error 30BA or 30BB cannot be cleared (re-appear)

All (6 pcs) ignition coil drivers (transistors) are replaced with improved model.

New drivers are characterized by:

  • higher maximal allowed voltage (480V instead of 250V)
  • higher maximal allowed current (51.0A instead of 8.9A)
  • lower losses: lower voltage drop at ON state
  • increased robustness: 300W power dissipation and overvoltage protection



Detailed information about the problem

Protection solution for transistors and ignition coils