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Old 07-28-2013, 11:17 AM   #50
jimmie504
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Join Date: Oct 2012
Posts: 78
Default Re: Swapping the VT25E for the 4T45E transmission!

The Saturn Vue ECU will have to be flash to contain data to control the solenoids, line pressure control and etc. The Vue ECU can recieve data from the speed sensor. The Vue ECU and TCM has to work in conjections, but the TCM was to be formatted and wipe clean, then the new operating "stand alone" tcm DATA has to be programmed into. Otherwise, the 4t45-e TCM will not convey data to the ecu for shifting points, because the ecu do not have data for solenoid operations, gear ratio and etc.
Unlike the Vue, the data connections went from ECU to TCM and then to BCM. on the 4t45 it is TCM to ECU, then to BCM. The 3 wires are needed to transfer data, actual 4,counting the stop lamp signal (blue wire), dark brown w/black (radio/keyword serial data), Tan and tan w/white (CAN) or Tan and tan w/black.

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