Originally Posted by
safelife
Without any ADR you're lacking the speed info to apply delta Vref to... you’re on BUSS then.
If you have a BUSS!
Although, with an ADR 1+2+3 fault (assuming it’s a computer problem rather than a probe issue) the ISIS should still work so calculating an appropriate VAPP could be used to cross check the ISIS with the BUSS green triangle. I’d expect VAPP to be VREF+15 as it’s direct law.