DFI Computer ZN1300

How does low voltage hurt the electronics?

Quite easily:

When these early fuel injection systems were designed, the OEM board manufacturers did not use robust board-level circuits.

They were susceptible to low or high current, burning up a diode or relay within the circuit board.

Most common was low current, due to weak batteries. From bikes sitting, and not being plugged into a battery tender.

New electronic hardware can control their voltages much more precisely and are much more resistant to dips and spikes in current.

T

Sorry, I'm still not getting something. Are you suggesting that lowering the supply voltage increases the current somewhere in the circuit?

No:

Just that the circuitry is susceptible to low and high current damaging the box..

T.

Ok let me see if I can explain what they showed us in GM ( General Motors) school.When volt goes low the draw on the circuit goes up mean heat. So if the voltage goes to low the draw by the circuit board gets hot and over time a failure. The same thing happen if the voltage goes to high the circuit board will get hot and burn and failure once again. Now the lower voltage failure takes longer but it does burn the circuit board.

That makes sense for an electric motor where the speed of the motor is fixed to the line frequency so dropping the input voltage necessitates a increase in current which can burn out the motor. Never head of that in an electronic circuit though. If nothing else fuses could be used to limit current damage in low voltage situations. Perhaps the diodes mentioned are sacrificial diodes - are they easily replaceable?