Problem #1billion

spinn360 · #1 03-19-2006, 11:41 AM

So I still have yet another prob or 2. Besides the fact that my CE light came on and I got the right knock sensor code and left o2 sensor code. The car still drives fine and I cleared and now its not doing it (for now anyways). The AWD isnt functioning correctly. Most of the time the car acts like the FWD fuse is in (which its not). If its snowy out the car sucks, spins front end, and is just overall terrible not to mention scarry to drive. Sometimes when I am driving on different occasions, the rear end feels like there is power getting to it. Usually when I am taking off from a stop while turning. Once when it snowed the rear end would kick in but late the front would slip for about 2 seconds before the rear end would finally kick in (rather hard too).

Now I know most people might be thinking the transfer clutch, but I dont think so. I am thinking the duty solenoid C is stuck in the FWD position, only jarring loose somtimes, or the TCU is really messed up and is not controlling the AWD correctly. I have tried the test of putting the car in D with key on engine off and listen for the solenoid while pressing on throttle, I hear nothing. I know that if the solenoid fails its supposed to be 50/50 split, and not the 95/5 or whatever fwd mode is. But if it was like that then I would feel it binding always instead of sometimes. If the transfer clutch was bad I would feel it never. Yet the solenoid must work sometimes because the binding happens occaisionally which means the transfer clutch still works. So I am putting a switch in to turn off power to solenoid C, incase the TCU is messed up this should allow me to turn on the 4WD when its snowy/icy out. But if that doesnt work then I guess I will have to replace the solenoid C or at least clean it.

Manarius · #2 03-19-2006, 01:25 PM

Sounds like Solenoid C problems to me. Slow AWD response is typical Solenoid C.

NikFu S. · #3 03-19-2006, 02:34 PM

I was under the impression it is more likely for the solenoid to fail closed in which case rear biased torque would be lost.
This is what mine did.

spinn360 · #4 03-19-2006, 02:55 PM

As far as I know when solenoid c fails the fail is supposed to fail to make a 50/50 split rather then a more FWD split because of safety purposes. I could be incorrect. Anyways I got some info off from this sight that say's the wire from the TCU for solenoid C is located on upper plug when looking at TCU and it is the green wire with red line on it. I just looked and there are in fact two green wires with red lines on that plug. Does anyone know which wire infact does control solenoid C from the TCU??

NikFu S. · #5 03-19-2006, 03:00 PM

My case might be special because I did stupid things like burnouts with the FWD fuse in, so it failed as I destroyed it.

But it's possible your could have failed open (100% load?) and blew your center or rear dif (or likely a few teeth) which would explain the random rear power surges, maybe?

---
I can't remember whether 100% load is open or closed.

alltrac · #6 03-19-2006, 03:28 PM

one 22690AA180 Oxygen Sensor
one 22060AA031 Knock Sensor

$130 shipped brand new in the box genuine OEM Subaru parts.

Manarius · #7 03-19-2006, 03:22 PM

Quote:

Originally Posted by spinn360

As far as I know when solenoid c fails the fail is supposed to fail to make a 50/50 split rather then a more FWD split because of safety purposes. I could be incorrect. Anyways I got some info off from this sight that say's the wire from the TCU for solenoid C is located on upper plug when looking at TCU and it is the green wire with red line on it. I just looked and there are in fact two green wires with red lines on that plug. Does anyone know which wire infact does control solenoid C from the TCU??

When the solenoid fails, it fails in the closed position, making the car 100% FWD. Making it 50/50 would require the TCU to make it open all the time, which isn't the case.

spinn360 · #8 03-19-2006, 03:34 PM

Quote:

Originally Posted by Manarius

When the solenoid fails, it fails in the closed position, making the car 100% FWD. Making it 50/50 would require the TCU to make it open all the time, which isn't the case.

This is WRONG! SORRY

So does anyone have a FSM that would show the wire location? Or am I just going to have to experiment?