QuestionQUESTION: Transmission A604/TE41, won't shift - in limp mode. The safety shut down
relay is off, when you connect pin 56 of the controller (battery feed) the relay
will turn on momentarily then shut off, this is in park with the ign. off.
Turning the ign. on (or starting the car) makes no difference. The pressure
switches and sol. drivers won't work without the relay output voltage present
(so low pressure can't be telling it to go in limp mode). All the gnds have
been ohmed out, voltages checked at starter feed and ign feed, back up
lights turn on, and throttle pot has var. resistance. Any ideas what would
keep the safety shutdown relay off? I am getting a code 15 which is eatx
relay off. Thanks
ANSWER: Hi Doug,
The manual gives the following possibilities for a code 15:
relay failure (open contacts)
short to ground in EATX relay coil power circuit
Open EATX relay coil power circuit between relay and controller
Open EATX relay output cicuit between relay and controller
Open EATX power ground (B-) circuit from relay to ground
Open battery feed circuit from relay to splice
40-way connector problem (cavities 15,16, and 17)
Internal controller failure.
Thanks for the complete description of your efforts so far. After you check thru this list, if you don't have success write back and I'll spend some more effort on the details of this circuit. I have the '92 ETAX manual, and a '93 van manual to work with.
Roland
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QUESTION: The red/wht wire at the relay has 12v, the battery feed at pin 56 has 12v, if
you remove pin 56 and reconnect, the relay does pick, there is 12 volts at 16
and 17, then the relay shuts off. I have 2 controllers, they both do the same
thing. I guess the question is, what tells the relay to open and close in a
static state? Does the turbine speed sensor tell the relay to close once it's
spinning? I also have 2 sensors on the back side of the transmission that I
can't find on any print (1 at the output shaft, the other in the bell housing.
Thanks again!
ANSWER: Hi Doug,
Pin 15 from the controller has to apply 12v to the relay to activate it. I am uncertain what the controller has to check before it puts out the voltage. Clearly, if it doesn't put out the voltage the trans goes into limp-in mode so in theory any reason for limp in could cause this to occur (there are 33 possible causes for limp in, but a code should be set, and that includes code 15). I can copy about 12 pages of troubleshoot for code 15 and wiring diagrams and postal mail them to you so you can try these. It costs me 10 cents per side plug 58 cents postage so once you get these you could send me back four 41 cent stamps to cover my costs. Use the "thank and rate" tab to list your mailing address in the comment section.
Roland
---------- FOLLOW-UP ----------
QUESTION: It seems that the TCM was bad. Pin 43 only had 1.5 volts, while a good one
has 2.6 volts. Do you know what pin 43 does (CCD +)? Also I picked up a
used one for a Voyager/Caravan (junk yard #3084, the car requires #3082)
do you know what the difference is? Are the pins the same (it still doesn't
work right but better).
thanks, doug
AnswerHi Doug,
Pin 43 and pin 4 are the data bus twisted wire pair. One is biased -2.5V the other + 2.5V and the digital signal is carried on the pair. So the 1.5 was off-value for sure. I don't have the controller # assignments but I suspect a parts counter at the Chrysler dealer will. The pin assignments appear to be very solid, with no noticeable reassigments over the years for a given type of transmission. They differ as to detail values which might vary depending upon the application (engine,trans, body,etc.) I am glad you are making progress.
Roland
