vwroad87 wrote:
TonyS wrote:
Hi,
Thanks for your thread in this forum, very interesting.
I'm a french WJ Owner and i'm really interested by your "Hack" of the TCM.
I'm quite sure i'm having the same issue with my 02 4.7 WJ ! I have hard shift between 2/3 in the morning, unless i put more gas, and also rough between D => N or R => N when hot. Everything else is fine,no code, and all my Gearbox sensors are Mopar brand new ones !
Could you explain how to make my own Hack to test it please , as you explain here :
"I made a voltage divider out of two 20K Ohm resistors and connected it to pin 54 on the TCM"
I'll also try to test my sensor ground (pin 23), try to find pb on wire ...
Many thanks from France !
Tony
Check the harness, clean the connector.
You connect two resistors of equal value end to end. One end connects to chassis ground, the other end connects the wire that connects to pin 54 on the TCM. From where the two resistors connect in the middle (hence the divider name) that connection gets connected to pin 54 on the TCM.
Now I thought I had bad thermistor in the valve body but I changed that so I tried the divider to low the temp signal but the whole time that wire was shorting on and off to ground.
Do you have a scanner that lets you see your transmission temp in real time? If you don't have an check engine lights then I think you have a different issue such as wore clutch packs... If it's a 545rfe then you may try to "Re-Learn" the transmission with a good scanner. That resets the clutch pack volumes to account for clutch wear.
Good Luck
Thanks for yiour quick reply.
My connector / harness is clean, everything look in good condition.
I don't have DRB3 tools, only a simple OBD scanner that doesn't allow me to view my transmission temp. I have no error code with this tools. And everything is running fine when i drive. I think, it's like this since i bought it, something like 40 000 miles.
Thanks for your explanation on the divider, i'll try it as soon as i can. I'll also try to test my ground on both speed sensor, it could help to find an issue on this ground wire.
For the last point, i've read somewhere that it's possible to reset the transmission, to "Re-learn", without any drb3 tools... Will try it also !