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2004 Grand Cherokee no TCC engagement
09-22-2013, 01:45 PM
Post: #11
RE: 2004 Grand Cherokee no TCC engagement
I should NOT have been checking it like it's a GM!, while in Park. In NEUTRAL, it doesn't make bubbles on the dipstick. And after putting the quart removed back in, plus maybe another 1/2 pint, it's full and no bubbles. But throw it park and check it and it's bubbles galore. Guess I'm back to square one. I'll have his 01 jeep here at some point. I'll compare PID's with that one, plus figure out if trans will swap out.
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09-22-2013, 07:37 PM
Post: #12
RE: 2004 Grand Cherokee no TCC engagement
A call to your local salvage yard might save you trouble as they have something called a Hollander's Interchange, which will tell you if things swap between different years or what else may need to be switched over to make it work. Ask nice and they may look that up for you.
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09-23-2013, 09:15 PM
Post: #13
RE: 2004 Grand Cherokee no TCC engagement
OK, I was reading over the posts & want to take a stab at this one more time.

You said that you just got this vehicle. My guess would be that the last person was having problems, couldn’t figure them out & sold his/her problem to you?

My second guess it that the fluid was burnt so they had the transmission flushed. That is why the fluid looks & smells OK. But, since everything was plugged with Torque Converter Clutch material, they blew out the filter &/or valve body gasket. That is the cause of the bubbles. Checking that trans. in park should just produce an over-full situation, no bubbles.

So if it was mine I would at least drop the pan and have a good look around before pulling the transmission out. You may find something far less expensive than an R&R? Also keep in mind that that transmission takes Chrysler +4 fluid. If you do the R&R I would recommend changing the Torque Converter too.

Please keep us posted on your progress.

Thanks for using the forum,
Garner

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10-02-2013, 12:19 PM (This post was last modified: 10-02-2013 01:27 PM by Jimmy.)
Post: #14
RE: 2004 Grand Cherokee no TCC engagement
Thanks for more input. I'm currently still trying to determine if trans in his old jeep (2001) is interchangeable with this one (2004)... the 01 LOOKS different to me. Pan is definitely different on the bottom but not sure if different shape/bolt pattern. And of course, don't have both jeeps here at once. Meanwhile, he's driving the 04 without any trouble at all except no TCC engage. I have trans shop connections and so far (diagnosis by symptom over phone...) is it's most likely control problem. I can activate the tcc solenoid with my scanner and hear it click. When I get the jeep back, I will back probe the circuit and make sure the computer is indeed not commanding it. But so far the consensus is that if the ecm is commanding the tcc, it should show such on the scan data and then should set a code.
Also, pan doesn't look like it's been off recently (if ever).
UPDATE: determined both trans are the 42RE and interchangeable. Nice to know he has a spare! Will update when/if I ever proceed with diagnosis.
But my final question for the board is for confirmation that scan data should show TCC solenoid "ON" when called for, regardless of condition of it or the tcc itself. (not surprising if no-one really knows!)
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10-02-2013, 08:54 PM
Post: #15
RE: 2004 Grand Cherokee no TCC engagement
In my limited experience if there's a command to be "ON" then the scan should show it as "ON" even if it doesn't happen. I do not know if this situation will set a code on a Jeep but it will on older GM products. Since I work mostly on GM (fleet work) I have also found ECM issues where it does NOT command a TCC and another vehicle where there was no command for first gear even though the other gears were fine. IOW, an ECM failure. I wound up taking them to a trany shop because these were early 90's vintage and OBD1, which I do not have a scan tool for.
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10-03-2013, 09:17 AM
Post: #16
RE: 2004 Grand Cherokee no TCC engagement
From what I can remember I would agree with Rupe. If the ECM commands the TCC on it would show “On” on the scanner. If the ECM command is “On” and the TCC doesn’t engage the ECM looks at Input and Output sensor data, determines a “Gear Ratio” error, and turns the CEL on. If it isn’t “Commanding” on, there would be no gear ratio error, & no CEL. That would lead back to finding out why there was no Command; i.e., Brake light switch, speed sensor error, temperature sensor error, faulty ECM. So you wouldn't want to change a transmission to find that you have the same problem and a much smaller job will fix it.

Thanks for using the forum,
Garner

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10-08-2013, 11:05 AM
Post: #17
RE: 2004 Grand Cherokee no TCC engagement SOLVED
Thanks again to both Rupe and Garner for backing me up on my reasoning. The Jeep in question did finally come back for further diagnosis. Monitoring the TCC circuit at the ECM showed steady voltage that never dropped, indicating solenoid live and ECM never attempting to activate (by grounding). Once again checked every single PID in every menu to find nothing out of order. Replaced ECM with a reman... note... must be flashed and a used factory ecm could not be reprogrammed for this jeep...
problem solved!!! He's got himself a nice Jeep for short money, and a spare transmission from the 01 if he ever needs it!
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10-08-2013, 11:20 AM
Post: #18
RE: 2004 Grand Cherokee no TCC engagement
Thanks for the follow up here.

It's rare that an ECM goes bad but it does happen and changing an ECM (even with the extra hair pulling and parts chasing) sure beats changing a trany only to find that's not the problem!
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10-10-2013, 06:08 AM
Post: #19
RE: 2004 Grand Cherokee no TCC engagement
not sure if jeep and Chrysler are the same as far as parts go I know they are owned by the same company but if they are I had a similar problem with my Chrysler t&c trans went into default mode ended up with an expensive rebuild before time due but was close, but the problem ended up being the computer witch was way cheaper than the rebuild but ended up being an added expense.so if all else fails.

help where i can leave the rest up to the everybody else
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10-10-2013, 10:44 AM
Post: #20
RE: 2004 Grand Cherokee no TCC engagement
The lines are a blur between the two brands but when you open the hood and see similar stuff on both you know they share a parts pipe line. Just last week I replaced an alternator on my Grand Caravan then an hour later was looking at a Jeep Liberty (6 years newer) and saw almost the same part under the hood.
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