A 604 tranny problem !!

[carzboyz]

I read the electronic transaxle diagram and I don't see the shutdown relay on it ? on what circuit is this relay??

[Boogieman142]

the asd relay, thats cause it has nothing to do with the trans, it gives power to the coil, fuel injectors, and fuel pump. without it the engine will not run

[carzboyz]

Why a tcm wire go into this relay ?? Its the wire on the pin # 15 on the tcm connector

[mwinkle353]

Maybe to power something when the engine is actually running?

[carzboyz]

My father I found in the wirring diagram if the hood is open it doesn't give power to the pin 15 of the TCM I can't close the hood because the hood is not installed yet ?? Why it can't run normaly without hood ? In my daytona shelby I made 60 mph without hood there's no safety and why the a604 have this genre of protection ?

[carzboyz]

Ok I take a ride this afternoon and the trans start to shift I was in third and sudently the transmission downshift in second gear and upshift in third and return in second and stay in second !! ****ing A604 . And When I started the car this afternoon I heard the stundown relay CLIC !! But this is was the only time He made it !! after that I never heard it again !!

[carzboyz]

nobody could help to slove the problem ??

[EvilcowRoland]

By "stundown" relay, do you mean the ASD relay? It's possible your relay is bad. If the TCM isn't getting power then it would put the trans in limp mode. Getting power intermittently might cause the up/down shifting you experienced. Try testing or swapping the ASD relay.

[85lebaront2]

Ok, first item. The ATX shutdown system is slightly strange. The Relay gets it's signal from the ATX computer. If you temporarily hotwire the power to the ATX computer (TCM) you should be able to make it at least find all 4 gears. The ECM talks to the TCM through the CCD (Car Collision Detector) (don't ask why Chrysler calls it that) and it also gets a throttle position signal and RPM from the ECM. The turbine shaft and output speed sensors complete the inputs other than the gear position switch or switches (depends on year). The solenoid pack also has pressure switches to tell the TCM what gear is applied. If the expected gear ratio doesn't show up, the TCM will have a "gear ratio mismatch" code and go into limp in. Check the turbine (nearest the engine) and output sensor plugs. I had a problem with my 89 Grand Caravan due to a loose plug. It would leave a stoplight, jump to 2nd then just stay in 2nd. Turning the key off, then back on would let it upshift and stay in gear. It definately sounds electrical in nature.
Good luck with it!

[mwinkle353]

Phuck it!!!!!!

go to the JY and get a 5 speed setup for the car. Then you'll never have a non-power or limp mode issues again!!!!!!!!!!

[Boogieman142]

what he said, its what everyone else did too....sorta....

[EvilcowRoland]

Good luck with that. I've been looking for a 543 in the yards around here for a couple years. Not a single one has come through. The THIRD 604 trans in my Baron has crapped out on me. No more 604's for me. I'm going 5-speed.

Anyone consider a 670 swap? Even that'd be better than the craptastic failure that was the 604.

[ShelbyDodgeImp]

Quote:

Originally Posted by carzboyz How could you deactivate the limp mode ??

You CANNOT deactivate limp mode.

Here's how limp mode works:

You have a "solenoid pack" that sits inside the trans. This is what makes the A604 try to do its "magic"- think 4 injectors only for atf, they operate at 114 hz 35% duty cycle.

Any given gear requires at least two solenoids to be engaged, and to control lockup a 3rd is modulated.

Inside this pack are two pressure switches that monitor the hydrolic system of the trans.

The solenoid pack ALWAYS has +12 volts and the TCM turns on the solenoids by giving them grounds when needed. When these two pressure switches detect a problem they take that +12 volts and send it through an internal resistor(s) to ground thus totally cutting off the power to the solenoids.

When the TCM triggers limp mode, it just stops giving grounds to these solenoids. You can not simply throw a ground on a solenoid and expect it to work anymore than you can expect to hard wire a fuel injector this way (unless of course it is a cold start injector) it will burn up the coil in the solenoid if used improperly in this way.

Without any power to the solenoid pack, or no ground on the solenoids- the trans will (if nothing is physically wrong with it) have reverse, 2nd, neutral and park.

As to ATF3- that's been discontinued, Chrysler released a TSB in 06 saying to use ATF4 in all ATF3 applications. You do not have to go to the dealer anymore to get ATF4, numerous places sell it, even some walmarts. Do NOT use dexron or dexron + an additive. This is a high tech designer fluid with very specific properties that effect wear, slip and other things.

[c2xejk]

Quote:

Originally Posted by ShelbyDodgeImp When the TCM triggers limp mode, it just stops giving grounds to these solenoids. You can not simply throw a ground on a solenoid and expect it to work anymore than you can expect to hard wire a fuel injector this way (unless of course it is a cold start injector) it will burn up the coil in the solenoid if used improperly in this way.

It's urban legend that you will burn up a fuel injector by applying 12v to it... or at least mopar injectors.

[ShelbyDodgeImp]

Quote:

Originally Posted by c2xejk It's urban legend that you will burn up a fuel injector by applying 12v to it... or at least mopar injectors.

How many hours have you run one with constant voltage and constant ground?

You may not detect a difference in the short term but it WILL effect unit life.