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Iv got that error. Checked the exhaust valve-moves fine. Check cables-moves fine. Took the actuator out -the pulley not moving at all. I am not sure if it should move freely or not. Looked inside -everything looks like new, all gears looks like new they all spins. Is anybody knows how to check if actuator actually works? I have repair manual and nothing there about that, only about adjustment. Help please. If any of you guys with aftermarket exhaust have an actuator that you don't use anymore I would buy it. Let me know
 

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It's a simple DC bi-directional stepper motor. Determine which wires go to the motor and which go to the sensor. Apply voltage to the motor wires (be careful, not for long, suggest using a 9 v battery) and motor should rotate the pulley.

You can't move the actuator pulley by hand.
 
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