interval 80 the channel 1 and 2 signals may begin to deviate from each other by more than a predetermined amount a and the program 50 may move from state block 66 to state block 82 per state transition arrow 84 in this state the throttle setting 24 tracks the channel with the lower throttle signal thus ensuring a conservative operation of the vehicle if channel 2 or the lower channel should then fault during interval 94 then as indicated by state transition arrow 86 the throttle setting 24 will drop to a high idle level 89 high idle level is set so that the engine will remain running and will permit driving the vehicle at a very low speed of around 5 miles per hour to a service center this high idle condition is shown by state block 88 and this transition is indicated by state transition arrow 86 if at state block 88 one or both of the channels stops being faulted as shown in interval 95 then as indicated by state transition arrow 90 the program 50 proceeds to the ramp up state 92 in which the throttle setting 24 ramps upward either to 1 the lower of the two throttle signals of state block 82 as shown by state transition arrow 97 2 to the channel 2 value per state block 62 if channel 2 recovers as indicated by state transition arrow 96 or 3 to the channel 1 value of state block 64 if channel 1 recovers as indicated by state transition arrow 98 if the fault returns during the ramping process the state block 88 is returned to but with the same smooth ramping between the last throttle setting which may have been arrived at during an incomplete ramping and the.