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It's assuming a 0-5k pot is attached, and also the current sensor. one way to check PWM is to measure voltage from any gate resistor to ground. Well, the ground of the output of the DC-DC CINCON. (also known as the ground of the MIC4451). Measure the voltage at zero throttle, then, give it nonzero throttle, and the pwm will ramp up to 100%, so you should see the voltage climb to around 12v on the volt meter. That's because it's trying everything it can to see some current feedback to match throttle position, but the current feedback continues to be 0.
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