Help with A604 transmission

Help with A604 transmission

PostBy: dkononczuk On: Fri Nov 20, 2009 8:18 am

Please
I need help with my A604 transmission.
Is here anybody familiar with this type.
It is in a 2004 Dodge Grand Caravan.

Here is short story.

I replaced transmission on my 04 caravan.

After reconnecting all plugs, oil lines, etc. I started the engine.
It idles fine. While pressing the break pedal,
I shifted from P to R, it works,
then from R to N, it works,
then from N to D, it does not work, seems like the tranny is still in N (and at the same time my ABS and Parking Brake lights up and stays lit).
But if I go back to R it works.

I have checked and rechecked all connectors.
Transmission sounds normal, no strange noises.

I'm clueless at this point.
Please tell me it is something simple that I missed.
I hate to have a car that only drives on reverse.

Dan
dkononczuk
 
Stove/Furnace Make: Harman VF3000

Re: Help with A604 transmission

PostBy: Poconoeagle On: Fri Nov 20, 2009 8:23 am

re-learn procedeure/reprogram. Those era mopars had a specific procedure reguarding this. If I recall it started with disconecting both battery cables and touching them together for 20 seconds to de learn the puter.

then it was put the positive cable on the battery, then the negative.


i am fuzzy about it as the method used at the mopar shops involved a vetronics programming device i think.

is this a used trans you installed??

three rapid cycles of the key, on,off,on,off,on should allow power loss light to flash out codes...
Poconoeagle
 
Stove/Furnace Make: Buckwalter & Co. , EFM520
Stove/Furnace Model: No. 28 Glenwood 1880, Alaska

Re: Help with A604 transmission

PostBy: 009to090 On: Fri Nov 20, 2009 8:32 am

Yeah, Re-learn procedure should be in Owner's Manual.
009to090
 
Stoker Coal Boiler: EFM 520 HighBoy
Hot Air Coal Stoker Stove: DVC-500 x 2
Coal Size/Type: Anthracite Rice


Re: Help with A604 transmission

PostBy: dkononczuk On: Fri Nov 20, 2009 9:36 am

It is a used transmission.
I'll give a try to almost everything.
I just don't look forward to removing this transmission again.
Takes few hours, and I already had to remove it twice.

Any other tricks please let me know.

Also is the ABS system somehow connected with transmission system?
Why suddenly my ABS and BRAKE lights came on?

Dan
dkononczuk
 
Stove/Furnace Make: Harman VF3000

Re: Help with A604 transmission

PostBy: Poconoeagle On: Fri Nov 20, 2009 9:41 am

code was set and lites are on prolly from a abs wheel speed sensor un hooked or damaged when axles came out or in?????
Poconoeagle
 
Stove/Furnace Make: Buckwalter & Co. , EFM520
Stove/Furnace Model: No. 28 Glenwood 1880, Alaska

Re: Help with A604 transmission

PostBy: Poconoeagle On: Fri Nov 20, 2009 9:47 am

used trans could have been reason vechicle was in junk yard?? foward clutch pack or band bad?

did donor vechicle have foward motion before pulling??
Poconoeagle
 
Stove/Furnace Make: Buckwalter & Co. , EFM520
Stove/Furnace Model: No. 28 Glenwood 1880, Alaska

Re: Help with A604 transmission

PostBy: Poconoeagle On: Fri Nov 20, 2009 9:53 am

The transmission actually uses its very own computer, mounted in my minivan against the firewall on the passenger side. At first glance it looks like the engine's brain, but it's actually the transmission's.

It looks like from the chart that second gear requires the 2/4 and UD clutches to be selected, but if you don't have any clutch solenoids engaged then it actually naturally leaves everything to be as if it's in second. So this forces the four-speed transmission into its “limp“ mode. Engaging no solenoids can be accomplished by simply pulling the plug to the solenoid pack connector, shown highlighted in this picture:



It has one 8mm bolt holding it in, and it's pretty simple to reach with a 12“ extension.

Once I pulled this, although of course the van had no top end whatsoever, it was at least driveable again. No more grinding! It wasn't the torque converter after all. And both forward and reverse work, incidentally due to the reverse running off a fluid-based clutch, not an electronically controlled one. Acceleration was not nearly as bad as I feared, and top speed was around 60mph at 4000 RPM. Fuel consumption at this speed on the guage claimed 15mpg. Usable, but not great on the freeway. It has gone 50 miles so far in this mode.

So now I'm of the opinion that the problem is either with the OD clutch itself or with a sensor that fools the transmission controller (TCM) into thinking it should be engaged when really it shouldn't be.

Moral of the story: if you have one of those wretched trouble-prone A604 transmissions found in all the Plymouth, Dodge, and Chrysler vehicles listed below, and you start having transmission trouble, you can put it in its limp mode yourself to at least avoid towing charges, and maybe use it until you can buy another ride!

yank the plug and see if its got foward before you pull the bad used trans out again!!! bummer I know they suck to do. they make good coal bins when properly located on the property on blocks..... :P
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Poconoeagle
 
Stove/Furnace Make: Buckwalter & Co. , EFM520
Stove/Furnace Model: No. 28 Glenwood 1880, Alaska

Re: Help with A604 transmission

PostBy: CoalBin On: Fri Nov 20, 2009 2:03 pm

Heres a quick question

Do you hear the solenoid pack when shifting from N-D ??? You know that familiar ratcheting sound. If not check the connector pins & or swap out the pack & relearn the transmission. On my van, ABS unit was right under the drivers feet, underside of van. Could it be that you pinched the wiring harness against the frame (wtih both the sol pack & abs controller) when R&R the transmission?

Tranny guy I once spoke with mentioned that the differential spider gear pins would work themselves out on the 4 speed. (in his opinion caused by spinning the tires while turning under throttle) Tried not to do that & changed my fluid & filter every 30k, last time with the Chrysler ATF+4 lifetime fluid (synthetic???) - 150k of towing toys & trips. The ATF+4 is supposed to be a much better lubricant.
CoalBin
 
Stove/Furnace Make: Harman
Stove/Furnace Model: DVC-500

Re: Help with A604 transmission

PostBy: dkononczuk On: Fri Nov 20, 2009 5:34 pm

OK
Once I removed the connector on the solenoid pack and shifted
to D reved it to about 3K then the wheels started spinning.
So I guess the tranny is good, works in limp mode.
So the next step in tshooting would be solenoid pack?
Any other sensors that are related?
dkononczuk
 
Stove/Furnace Make: Harman VF3000

Re: Help with A604 transmission

PostBy: Poconoeagle On: Fri Nov 20, 2009 9:59 pm

well..... you mean it only moves foward at 3K rpm????

ya check the ole filter??

mopar 7176 fluid is the right stuff. atf+4 will work or dextron/mercon with the "black" bottle of "lubeguard" wil convert the fluid to the correct friction modifyers....


there a procedure "back door" method for most computer learn procedures....

for example any 3.1L gm...when replaceing battery they will stall at lights ect no shift ect...


ya start the car, hold foot on brake and put in drive for Exactly 10 min, then shut off and shift to park for Exactly 20 seconds, then start and put in drive again with foot on brake for Exactly 5 min, then shut off and puter is relearned to shift. drive the car like ya stole it and it will shift and perform like that!!! those slug camaros had that 3.1 for a while.......

your mopar sounds like it has potential!! 8-)
Poconoeagle
 
Stove/Furnace Make: Buckwalter & Co. , EFM520
Stove/Furnace Model: No. 28 Glenwood 1880, Alaska