Can VOCAL SCW 1 be built into a car driven
by a diesel engine?
YES.
Here the detailed explanation:
There are old diesel driven vehicles with a mechanical diesel
pump. Thus, for circuit-breaking there is only two electrical
circuits available: starter and throttle valve. For stopping
the diesel supply a solenoid valve from other antitheft
devices and different suppliers can be installed and activated
by the third relay.
With later diesel models with EDC diesel injection is blocked
using the third relay.