My question is whether or not I can remove the (TCU) from a AW-4 transmission and replace it with some after market valve body or just disconnect it and it will function normally from fluid pressure.
The (CPS) is probably bad and maybe the (SBECII) and the trans takes info from both.
The fuel injection and distributor are going to be change out and eliminate all sensors.
The TCU is not on the transmission itself, it is under the dashboard on the passenger side. It relies on the inputs from the sensors on the
transmission and engine and controls the solenoids in the transmission.
If the TCU is removed, the transmission will still work, but will not shift on its own but can be shifted manually into 1st, 3rd, and 4th
gears. The converter will not lock up.
If you eliminate all sensors, you can still shift the transmission manually. Basically you can run a toggle switch setup but instead of an
on-off-on switch, you can use just an on-off switch to control the solenoid that shifts the transmission into 2nd.
Take a look at this website for some possible ideas. As always, check with a jeep dealership to make sure that you will not do damage to your vehicle by removing your TCU.
〉 Answered on Aug 26th, 2008 by Amanda J. Pierce, MBA "AJ", Certified Mechanic, Project Coordinator; Primavera Scheduler at VIGOR Alaska Industrial Shipyard & BizzM3ch Solutions
Most trans modules talk to the ecm which could set off a check engine light. I would check with the dealer.
〉 Answered on Aug 26th, 2008 by Donna Burmeister, Service Manager at Classic Nissan