CNY_Dave
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Both control cables seized in my forester when it was about 10 degrees out, with the heat off of course. (In snowy weather I cool the windshield before parking and leave the heat off to help keep it cold) I ended up putting 2 small holes in the dash with stiff wire coming out, the wire connected to the doors.
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Wheel bearings increase the tone at the same rate you speed up, 2x as fast and 2x the pitch. Differentials pitch up by 4x the speed change, also diffs usually only make noise when on the gas and get quiet coasting.
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- differential
- whirring noise
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If the AWD mechanical bits are working then it should have bound up a little in limp mode, which is what the trans goes into when disconnecting that. You get 3rd forwards and reverse and full AWD. The TCU can only detect the voltage at the TCU so it's either a busted or shorted wire from TCU to solenoid, or it's the solenoid.
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What year and model is the car? What year is important, and the test they talk about with the fuse isn't measuring at the fuse, it's the wire to the solenoid. in 2003 the fuse would do one thing, in 2004+ it would do the opposite. The resistance would be measured with the TCU disconnected. The TCU solenoid is in the removable tail section of the transmission. With the FWD fuse out, and with it in, what does the car do when turning in tight circles? 2004 and after when the solenoid fails you get front wheel drive, which doesn't hurt anything. before that when it fails you get full lock front-rear.
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When you tested the resistance, it was with the TCU disconnected? The signal from the TCU to the solenoid is a pulsed pattern, you need an oscilloscope to see it, although you can get some idea of what's going on with a voltmeter, but it's not really a measurement you can use to say 'good/bad'. The pin at the FWD fuse is hust a signal line input to the TCU, it's not in the circuit with the solenoid.