basic multimeter will suffice..
@ X11 connector (round guy typically found on drivers fender under hood on 201's)
duty cycle = (voltage at pin 3 / battery voltage) X 100
(connect meter ground to pin 2)
this will give you an approx. value for duty cycle.
Should be 70% Key on, engine off for federal. 85% for cali.
If its a fixed voltage after say 30-40 seconds of running, then its throwing a fault code and something is broken/out of adjustment/etc
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