A 604 tranny problem !!

[carzboyz]

Hello I finished my 3.0l conversion in my car and the transmission stay in second gear. the transmission don't shift and downshift it always stay in second gear! I tried the transmission in my part car before the swap and it worked very well !! I have the fault code 37 and 33. Help me please . Thanks you

[c2xejk]

2nd gear is the "limp" home mode. I would guess there is wiring problem with the transmission and computer.

[carzboyz]

Do you have a procedure to find the problem ?? Does there is fault codes for this transmission ??

[mwinkle353]

I really hate to ask this. But did you use all of the donor car's wiring harness and computers?

It almost sounds as if the solenoids are not in control one bit.

[carzboyz]

Yes its the wirring and computers from the donor car . The donor car was the same model has mine a p body 4 door and it was built the same year

[gkcooper]

You have to have a scan tool to see the EATX fault codes. If you do the standard 1-2-3 key/on, you will just get engine management codes. I also suggest that you have a wiring issue.

[carzboyz]

what I need to check in the wirring ?? fuses fuses links wire ?? connections ?

[carzboyz]

How could you deactivate the limp mode ??

[kreel]

Disconnect the battery for a few minutes. It'll clear the memory and the tranny will shift normally again. However, once you reconnect the battery chances are that it will go back into limp mode almost right away

[carzboyz]

What is the purpose of the two relays on the transmission computer ! And I puted some dextron III transmission fluid in the trans because after the swap the fuild level was low. Does the dextron III fluid can be the cause of the problem

[lookin]

Quote:

Originally Posted by carzboyz Does the dextron III fluid can be the cause of the problem?

Yes that is the problem.


Never put Dexron in an A604.

DO NOT try to DRIVE IT UNTIL YOU DO THE FOLLOWING.

You need to flush all that Dexron fluid out.

You can not not just drop the pan and drain it, because only some of the Dexron will be removed.

You also need to put on a new transmission panel filter.

Then fill it with ATF 4.

If you haven't driven it much, since putting in Dexron, then it may not have been damaged too much.

[carzboyz]

Why dexron III fluid put the tranny into limp mode ?? And what is the major difference between atf and dexron fluid ? Thanks you

[c2xejk]

It won't put the trans in limp home mode right away. It will cause problems in the longer term. From what has been described here, I don't not believe the Dex3 is the immediate problem (it still needs to be replaced.)

Did pulling disconnecting the battery cause it to shift? If not, the controller is detecting something right away or it is never powering up or not connected...

[carzboyz]

Does the 2 relays on the transmission computer could be the problem ?

[Boogieman142]

ones the asd, engine won't start/run without it and the other is for reverse lights which isn't ur problem. I'd definately make sure that everything is plugged in and if it all is then u need to get it scanned