[Richard L]

The injectors are the conventional type. Thanks for the update.

So far, from your information and tests. It appears the ECU momentarily switched in the injector(+) and fuel pump at the pre-cranked key position and shut off afew seconds later. This sequence pressurises the fuel line.

Once cranked and running, the ECU powers up the fuel injector (+) and fuel pump.

I guess the only way we tackle this set up without mistakenly triggering the HFS3 is by putting the thin red on the injector (+), temporarily enduring the system will not switch on until the enigne is up and running.