The duty c solenoid has started to fail on my 95 with 150K miles.  It stops for awhile and I get the dreaded 16 flashes on the AT Temp light.  But it then starts to work for a while.  This has been going on for a 1 1/2 months.  It's working now for example.  I've put in the fuse and it's illuminating the FWD light, for example.  I verified that it's trouble with the duty c by pulling the code [which is not easy by the way]

 

Does this sound like a mechanical or electrical problem?  I'v changed the trans fluid enough so that the fluid now is pristine.

 
Any ideas.

 

 

 

 

With the FWD fuse installed/inserted in fuse holder, do you have FWD ONLY or does the torque bind go away (assuming it has TB)? If so, it's mechanical.

 

If the fuse makes NO difference in the AWD funtion than it's electrical.

 

TD

 

codes:

Trouble Code Table

Trouble 
Code

 11 Duty solenoid A

12 Duty solenoid B

13 Shift solenoid 3

14 Shift solenoid 2

15 Shift solenoid 1

21 ATF temp sensor

22 Atmospheric sensor

23 Engine revolution signal

24 Duty solenoid C

25 Engine torque control signal

31 Throttle sensor

32 Vehicle speed sensor 1

33 Vehicle speed sensor 2

Edited December 30, 201510 yr by wtdash

The computer can't detect a mechanical problem with the solenoid valve, it can only detect a short or open connection.

 

It could be a bad connection, there's a the connector at the TCU, then the one at the back of the engine right near the dogbone link.

I found a post in 2011 on this forum where a guy had the same problem [an intermittent FWD failure].    The guy changed his duty c solenoid but the intermittent FWD failure wasn't fixed!  One of the posters said that he found a lot of the TCM's had a transistor failure for the wiring to the duty c solenoid.

 

So I bought a used TCM which I will install in a week. Of course the problem still could be in the external wiring or the solenoid itself.

 

PS The trouble code for the duty c only shows an electrical problem.  There is nothing in the wiring to the duty c that would allow the TCM to diagnose a stuck or plugged valve.  So its got to be an electrical problem.

A burnt TCU solenoid drive transistor is usually visible, you can open it and look.