First thing you should do is see if you can move the IMRC butterflies by hand to make sure they aren't physically stuck. Follow the cable from the box to the bellcrank and try turning it by hand (you might have to unhook the cable at one end).

Here's the diagram (page 5): http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=9191

Red wire is 12V power, grey/red wire is 5V reference, and black/white wire is ground. The blue and brown wires are left, one is probably the IMRC position signal and the other is probably a PWM signal to control the servo motor.

I know the gears or cable mounts inside the IMRC boxes can break, so the box might be the problem.

 

The butterflies are moving freely, I grabbed the cable with a needle nose and pulled and they move freely, I did also discover that the cable the IMRC box pulls is snapped.

Wouldn't spring tension hold them closed not open though? And thanks for the diagram Behlinla, ill use it to check the boxes at yards.


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Yes, I think the spring will hold them closed but because the cable is broken it looks like they're stuck open to the IMRC box where the sensor is.

 

Ah okay, to the junk yard!


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