To reset fire service with IO injection you have to do the car and group IOs at the same time. Open both IO maps, enable IO injection in both. Pull FSH2 low (blue) in both IO maps then change injection back to red, pull FSH5 high in both car and group, wait a second then click again to un-inject FSH5, then click FSH2 in both maps to force high. Now you should see the car and group go back to auto. Then click FSH2 one more time to un-inject.