Duty cycle range check

P1638 

If the duty cycle of the digital position controller exceeds a calibrated maximum or lies below a calibrated minimum for a long period of time T2, a duty cycle malfunction (and hence an actuator current malfunction) will be detected. The system will then be placed in the throttle valve default drive function state and a maximum fault DVER is set. If the duty cycle exceeds the calibrated maximum or lies below the calibrated minimum for a calibrated period of time T1 that is much shorter than T2, the system will request a brief deactivation of fuel injection and a minimum fault DVER is set.