1'st GEAR STRUGGLING-- SOLENOID PROBLEM? - JeepForum.com
 
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post #1 of 12 Old 10-18-2019, 10:19 AM Thread Starter
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1'st GEAR STRUGGLING-- SOLENOID PROBLEM?

98 XJ, 180,000 MILES, 4L, AUTO.

Vehicle has been running great, then yesterday was cruising around town, and the CHECK ENGINE light came on.

This was quickly followed by very sluggish takeoffs from a stop in 1'st gear. Reverse, and all the other gears seem to be working OK. But taking off from a stop in 1'st gear, feels like I'm pulling a big heavy trailer-- the engine struggles and the Jeep barely creeps forward. And all this time, the CHECK ENGINE light stays on.

I haven't checked any codes yet. But I do recall that the ECU periodically checks continuity on the solenoids in the auto trans. I'm wondering if my 1'st gear solenoid has failed, which would trigger the CHECK ENGINE light, and cause poor engagement of the 1'st gear.

I know the shift solenoids can be checked from outside the transmission, but it will require pulling the transmission pan to actually access the solenoids.

Anyone had this problem before?

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post #2 of 12 Old 10-18-2019, 10:56 AM
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lets get the codes, IIRC this is a AW4 .

I suspect the odd gear feeling is being in limp mode - but the codes are step 1, as the CEL is on.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 12 Old 10-20-2019, 07:39 PM Thread Starter
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Quote:
Originally Posted by jtec View Post
lets get the codes, IIRC this is a AW4 .

I suspect the odd gear feeling is being in limp mode - but the codes are step 1, as the CEL is on.
JTEC: Thanks for your reply. You might be amused to know, where i work we make the Jeep Truck Engine Controller (JTEC). Look at the casing on your controller. If it shows the 'Batwing M', then yep we made it.

Yes, this is the AW4 transmission, probably should have mentioned that earlier.

It's been about 10 years since the transmission was serviced, so I'm doing a basic fluid/filter service, dropping the pan and having a general look-around inside. (Don't panic about the 10 years-- I live in a small town and don't drive the Jeep more than 5,000 miles per year.)

This afternoon i drained the trans fluid and pulled all the pan bolts. THEN I encountered my arch-enemy, that hard gray sealant. Hate that stuff. I'm sure it works great, but it makes the pan reallllly hard to get off. I ran into this problem before on my son's Nissan. I gave up trying to get that pan off, because that car was running OK otherwise.

But not the case with my Jeep, must get that pan off. I found a Pan Separator tool on Amazon, think I'll give that a try.

Stay tuned, and thanks for reading.

[PS, non-related question: How do I keep the Jeep Forum site from timing out and logging me off while I'm typing a post?]
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post #4 of 12 Old 10-21-2019, 03:00 PM
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being old it often times out for me, I copy before submitting then if I must log in again at least I have the text saved and I just paste when I get page freshened up.

Let me know if attachment helps.
Attached Files
File Type: pdf AW4.pdf (3.24 MB, 2 views)

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #5 of 12 Old 10-22-2019, 07:55 AM
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Here's something REAL simple to try:

http://cruiser54.com/?p=58

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post #6 of 12 Old 11-05-2019, 06:37 PM Thread Starter
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I'm curious, what's the best gasket for this transmission's pan:

Rubber, Cork, or just Ultra Gray alone?
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post #7 of 12 Old 11-11-2019, 07:04 AM Thread Starter
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Jtec: The code was P0700, transmission solenoid circuit.

(And thanks for that AW4 pdf, very informative.)

I dropped the pan, changed the fluid and filter.

Replaced the 3 solenoids (inexpensive from RockAuto).

Opened and cleaned the two connectors up by the dipstick.

Put the pan and everything all back together.

Used Innova OBD scanner to clear the P0700 code.

She drives sweet and smooth now, almost can't even feel the shifts.

And no more Check Engine light. Wonder how much $$ I just saved.
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post #8 of 12 Old 11-11-2019, 08:18 AM
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Got a pic of the old screen?

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post #9 of 12 Old 11-11-2019, 09:34 AM Thread Starter
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Cruiser, did you mean, a pic of the screen in the old filter?

I still have the old filter, and I could probably get a pic of the screen.

Overall this AW4 was very clean inside. The magnets on the bottom of the pan didn't even have very much metallic shavings on them.
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post #10 of 12 Old 11-11-2019, 02:51 PM
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Quote:
Originally Posted by LEO_WRANGLER View Post
Cruiser, did you mean, a pic of the screen in the old filter?

I still have the old filter, and I could probably get a pic of the screen.

Overall this AW4 was very clean inside. The magnets on the bottom of the pan didn't even have very much metallic shavings on them.
Yes please.

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post #11 of 12 Old 11-13-2019, 11:26 PM Thread Starter
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Quote:
Originally Posted by cruiser54 View Post
Yes please.
Overall the transmission was pretty clean inside.

And so was the filter screen.
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post #12 of 12 Old 11-14-2019, 05:58 AM
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thanks.

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