Originally Posted by NUTS RuS
Daz I was just thinking if its blown how can it control fuel at all ?
If it's an S2 the basic fueling control is mechanical but enrichment for on boost and warm up is electronic...controlled by a seperate ECU.
The ESC 2 Ford ECU is a glorified ignition module with spark maps and boost control intergrated. All it does is comunicate breifly with the Bosch ECU (which controls fueling) on pin 25 and 20.