Jlewis

I have a 97 xj 4.0 and I have a failed 2-3 shift solenoid curcuit fault. Where is the that shift solenoid located?

Jlewis

The fault code is P0758 if that helps. The pic of the fault is below if your able to get it.

Jlewis

Let me know if anyone else has had this issue. Thanks.

azhobo

Shift solenoids are internal in the trans case.
I've got the same Jeep as you, had the same code/problems three (+or-) years ago.
Hadn't had the Jeep too long, so took it to a trans shop for a looksee. They found the valve body kinda varnished up (usually heating problems, could be total lack of maintenance too) and all shift solenoids showing blistered coating, bulging. (heat) Yes, the parts they showed me were out of my trans, I watched them come out.
They did a complete rebuild and all was wonderful, until a couple weeks ago.
Trans is shifting at random times, sliding into gear, and feels like it isn't locking up completely. Personally I think the AW-4 is junk from the factory, but a couple gents here tell me otherwise, so possibly I got a less than satisfactory rebuild. I looked into replacing it with a 700R4, but the cost of that was prohibitive for a retiree, or at least for THIS retiree. Will probably check out a different shop this time, and do another rebuild. BTW, no codes this time.
Hopefully your experience will be less costly and more pleasant.
HTH.
Bob

CCKen

The first step in diagnosing AW4 troubles is to check the trans fluid level when it is up to operating temp. It should be at or near the MAX line on the dipstick.

Next is to look at and sniff the trans fluid. Dab some fluid off the dipstick on to a white paper towl. If it appears black the fluid is overdue change. Sniff the fluid on the dipstick, if it smell burnt, there is problem internally to the trans. In either case, the fluid should be replaced (from the trans oil pan drain).

The proper fluid to use is Dexron III/Mercon. Do not use ATF+4.

If you want to test the TCM inputs, including the solenoid resistances, let me know and I will post the TCM connector pinout and test procedures. These tests require the use of a quality digital volt/ohmmeter.

Jlewis

I will need to check the TCM inputs. I've already changed the fluid because it was dark and old. I never smelt it so I don know on that. Thanks

SG Mason

I will save CCKen some time and just give you a link to the test you will need to do.

This post will give you all the tests you need to diagnose your transmission. CCK helped me out a lot so the least I can do is save him a little typing

Jlewis

Thanks for the info but I'm not sure which solenoid a,b or c is the 2-3. Do you know? I don't have any testers so l need to run out and get some. Also my transmission shifts fine for about the first 15-20min of driving the. After that it won't down shift. Are you leaning more TCM or solenoid after that last bit of info.

Jlewis

I don't need to check all that other stuff do I?

CCKen

SG,

I've improved (?) upon the pinout and test procedures a bit to include the '97 AW4.

Jlewis,

You are interested in the Specific Resistance Checks 2.5., 6., and 7.

Solenoid A is the 1-2/3-4 Solenoid.

You have to do the Preliminary Resistnce Checks Steps in addition to the Specific Checks.

You need a couple of safety pins to probe the small pin cavities in the TCM connector. The pic below shows three different sizes. The #1 or #2 size is what you'll need. Get them at a fabric store or the hardware in a variety pack.

The pic below the pins is an example of probing pin cavities.

See below.





Pins:



Exmple:


.

Jlewis

Wow, CCKen that is so well explained even a caveman can do it. Thanks!

CCKen

Make sure you use a quality digital Volt/Ohmmeter, not an autoranging meter.

Most folks getting into checking the TCM inputs do all the checks.

Jlewis

Is there any brand and model number you suggest?

CCKen

No, but Home Depot and Lowe's has a selection.

I bought an "Ideal" model 61-310 at Home Depot several years ago but I don't think they have this model anymore. I paid around $30 for it.

If you get one in the $30-$40 range it should be suitable.

Don't get the cheap communist chinese meters from Harbor Freight.

Pic of my meter doing a check on the IAT Sensor.

CCKen

Little better pic of it testing the MAP Sensor.