Theory Of Operation
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This diagnostic compares the output signal of the park position sensor to a threshold value to determine if operation is normal. The sensor provides an output signal with Pulse Width Modulation (PWM) at a fixed frequency and duty cycle proportional to the position of the actuator. The PWM duty cycle electrical range is between 10% and 90%. If the signal is in the electrical range but it is lower than a threshold, then the diagnostic will be considered failing.