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Transmission sensors

Tiny
JOHNML
  • MEMBER
  • 2001 CHRYSLER VAN
Six cylinder front wheel drive automatic 112,000 miles.

My wife was in labor this last Saturday so I sped to the hospital as fast as I could. Up to 100 mph for periods of time. This was a thirty minute drive.

But now, my vehicle is staying in second gear. Limp mode as I was told. I have already changed out the input and output sensors on the exterior of the trans. I was told that there is another sensor inside the transmission. So I am getting ready to get to tear into that.

Can someone please tell me what the ohms are supposed to be on the sensors to my transmission so I do not have to waste anymore money? I strongly believe that the problem is electrical and not mechanical.

It is a 2001 Chrysler Voyager six cylinder four speed.

What ohm readings am I supposed to have for the transmission control relay? What are my peramaters?

Is there anything else that I am overlooking or need to test out?
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Friday, October 1st, 2010 AT 6:24 PM

10 Replies

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Chrysler does not have any sensors or relays inside the transmission.
all on the out.
First step should be to check for codes.
most likely to be a faulty solenoid pack located side of transmission under the speed sensor. it is a black box with a square connector.
Codes first.


https://www.2carpros.com/forum/automotive_pictures/99387_chry_3.jpg

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Saturday, October 2nd, 2010 AT 6:04 AM
Tiny
JOHNML
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I found that there is a transmission range sensor in the transmission. Some where after the filter. I guess it has something to do with the temperature.

I checked the transmission control relay and that is good to go, as well as the fuse. So I guess I am down to the transmission control solenoid or possibly the range sensor. Anyone know how I can test those?
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Saturday, October 2nd, 2010 AT 11:23 AM
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
What do you have for codes?
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Saturday, October 2nd, 2010 AT 6:10 PM
Tiny
JOHNML
  • MEMBER
  • 6 POSTS
That is the bummer thing. There are no codes. I was doing research all weekend and today and I am believing that it could be my solenoid since it is mechanical and cannot throw codes. Am I right that sensors and the TCM will throw codes if there is a problem since they are electrical?

Well, my wife told me that just today that a code popped up cause we had to drive it, but I am not sure what the code is yet. There was no code when the problem just began. I just hope that one problem did not make another one.
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Monday, October 4th, 2010 AT 7:14 PM
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
It will take time, but codes should show up.
Let me know.
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Monday, October 4th, 2010 AT 8:17 PM
Tiny
JOHNML
  • MEMBER
  • 6 POSTS
I got the following codes: P0605 and P0700.

It is telling me that P0605 is TCM ROM fault with probable caused of one shortened solenoid or sensor within transmission two shortened electrical circuit three failed TCM.

P0700: Says trans-axle control system fault. Probable cause is one shortened solenoid or sensor within transmission two shortened electrical circuit three failed TCM.

I am thinking that it is the solenoid that is bad. But should I be thinking that it is the TCM? How can I test if the TCM is bad with a voltmeter? If my solenoid was bad would driving cause my TCM to go bad?

I guess I need to figure out which one is the bad one but they are both pretty expensive parts. How can I test the TCM? Solenoid?

Thank you for your continued help and support!
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Friday, October 8th, 2010 AT 10:48 PM
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
DIAGNOSIS - 41TE and 41AE -2001 Chrysler Town and Country Limited

DTC P0604, P0605 and P0700: INTERNAL TRANS CONTROLLER
Circuit Description
DTCs will set if an internal TCM malfunction occurs.
Possible Cause
Internal TCM failure.

NOTE: Ensure pre-diagnostic check has been performed before proceeding with following procedure. See PRE-DIAGNOSTIC CHECK.
Diagnostic Procedure
1. Record all DTC's and one trip failures. Using scan tool, erase DTC's. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Turn ignition from off to on, then start engine. Apply brakes. Slowly move gearshift lever through each gear position. Check if DTC P0604, P0605 and/or P0700 has reset. If DTC P0604, P0605 and/or P0700 is present, replace TCM. See TRANSMISSION CONTROL MODULE under REMOVAL and INSTALLATION. Perform SHIFT QUALITY QUICK-LEARN PROCEDURE and PINION FACTOR PROCEDURE under PROGRAMMING. If DTC P0604, P0605 and/or P0700 is not
present, go to next step.

2. Inspect the following for pushed out terminals or faulty connections and repair as necessary:
Engine Ground Connections
TCM Grounds
TCM Battery Feed
TCM Fused Ignition Switch Output Circuit
Power Feed To Transmission Control Relay

3. If procedure in previous step fails to diagnose problem, erase DTC's using scan tool. Perform VER-1A: VERIFICATION TEST. If trans-axle is still not functioning correctly, replace TCM.
See TRANSMISSION CONTROL MODULE under REMOVAL and INSTALLATION. Perform SHIFT QUALITY QUICK-LEARN PROCEDURE and PINION FACTOR PROCEDURE under PROGRAMMING. If trans-axle is functioning correctly, test is complete.
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Saturday, October 9th, 2010 AT 2:51 PM
Tiny
JOHNML
  • MEMBER
  • 6 POSTS
Thank you for your help. I will have to take it in to Auto Zone that has a code reader to clear the codes and stuff.

I am starting to truly think that it is the TCM and not the transmission solenoid myself especially after what you sent. Boy and all this started thinking it was the speed control sensors. Lol.

I tested the TCM to the best of my ability (and I do not know much of anything about electricity nor testing it). I took the wiring off and tested the actual unit. But I put voltmeter to the Ohms setting. Put my black wire to pin #57 (ground) then to the different solenoid controls and senses. I see by my book there are four control pins and three pressure switch sense pins. Out of the four solenoid control pins only pin 19 came back with 47.6 ohms and the others came back with open lines. :( I am assuming that I did the test properly. Can anyone validate that? One thing, with my voltmeter set to ohms, I put the black to my neg terminal on my battery and red to pin 57 (ground) and it still said OL. Is that the proper way to test for a ground. Do I just have a bad ground? Or is it still my TCM?

What is the difference between a solenoid control and a pressure switch sense? Was I right in testing the controls and not the senses? I honestly tested everything that I could in many different scenarios and this one seemed to make the most sense.

Sorry for all the questions, I am just trying to figure this out without taking it into a shop. Just had a new baby and we are trying to save money we do not have, lol.

Sorry for all the questions, but if my TCM is working properly to my solenoid cannot I test the values at my solenoid wiring harness? I have a picture an description of pins and stuff, I am just not sure on what or where to test and what to expects.

I am unable to find the ground location for the TCM. After thinking on it for a while, maybe I just do not have a good ground? Where are the grounds for the TCM? I have a service manual but cannot find it in there. It tells me near the T/O. But no pictures. What is a T/O? Maybe I knocked the ground loose when I hit the road debris that went under the van?

You have been awesome with your help!
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Saturday, October 9th, 2010 AT 9:03 PM
Tiny
BMRFIXIT
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https://www.2carpros.com/forum/automotive_pictures/99387_1_9.jpg

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Sunday, October 10th, 2010 AT 12:04 AM
Tiny
BMRFIXIT
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TCM ground location is above the starter.
Check black/red and black/yellow wires for a good ground.
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Sunday, October 10th, 2010 AT 12:35 AM

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