My transmission went out in my 1993 Toyota 4x4 (3.0 engine). It has an A340H automatic transmission. A friend sold me a transmission, A340H out of a 1994 4Runner. The only difference I see is that the neutral safety switch has a larger connector.I put my neutral safety switch on the donor transmission and installed in my truck. The only issue I have is the transmission seems to be stuck in 2nd gear. Even if I manually shift to low gear it is still in second gear. Would anyone know if the 1994 4Runner would have different electronics inside the the transmission compared to my 1993 truck. I will appreciate any feedback.

 

Just to update on my post concerning whether the 1994 4Runner transmission would work in my 1993 Toyota pickup. It will work. The other issue that I ran into was that the transmission would not go into low gear, basically stuck in 2nd gear. No matter if you manually shifted in to low gear. I had check ohms and voltages at the ECM. The shift and lockup solenoids all were in range~13 ohms (11-15 ohms is the specs).So I decided I would drop the transmission pan and investigate a little more. Long story short. All three solenoids in the donor transmission were after market. What I fould is that who ever install the solenoids installed them incorrectly--meaning the lock up solenoid was installed in the Number two solenoid position. The lockup solenid is a normally open solenoind where as the shift solenoids are normally closed. So, I bench tested all the solenoids inaccordance with the FSM, all passed and were installed correctly. However, all my problems with the shifting of my truck was not solved. I did have low gear when shifting manually but not in drive. So I disconnected the solenoids at the wiring harness and performed the automatic shift check as described in the FSM. That check passed. I reconnected the solenoid wiring harness and drove for about a mile manually shifting, would not go into over drive. I got a transmission code of 63 which is referencing the number 2 solenoid. I had just benched tested all the solenoids. I did not believe it was the solenoid. I continued to do more testing at the the EMC. There were two voltages that just did not make sense to me. One the OD1-E1 was showing battery volts when the FSM indicated around 5 volts. I next cheched the electonic control transmission volts Power On should be battery volts, but my meter was flashing, meaning it would not lock onto the voltage. I was basically pulsating, both with the ECT On or Off. This was puzzling. So I had a spare ECT module. I installed that module and that fixed all the shifting issues with the transmission. Just thought I would share what I done to, finally, get the transmission working.

 

I am new to post on this site, I hope I am posting in the correct area/page. I have a 1993 Toyota pickup, 3.0 automatic 4x4. The transmission is giving me fits, to say the least. I thought I had found the problem, ECT module. When I replace that module the transmission shifted as it should. I drove about 8 miles, again, shifted fine. Parked the truck for days. Got in the truck and in drive it is stuck in 3rd gear or overdrive. I have used the FSM to troubleshoot at the ECM. The only volt that is not in spec is OD1 and E1. The reading is battery voltage, around 1.56 volts. The spec indicated approximately 5 volts. I unplugged the cruise control ECU and the voltage did not change. I tried another ECM but the voltage at OD1 and E2 is at battery voltage. Although, the truck did go in low gear when in drive. But after going about 200 yards the transmission dropped back in to 3rd gear or overdrive. After my original computer had been out of my truck for about 30 minutes, I reinstalled the ECM and the truck shift fine. I drove for about ten miles, stopping at the store to get gas and continued back to the shop. Not issues at all. I let the truck sit for about an hour. Got in the truck in put it in drive and it was in 3rd gear of OD. This has me stumped. Does anyone have any idea as to what is causing this issue and what would cause OD1 and E1 to output battery voltage when it should be around 5 volts. The truck will pop a code of 63 (number 2 shift solenoid). I have remove the solenoids and checked the ohms, applied 12 volts and checked for proper seal when applying air pressure. This is an unusual issue. Thanks

 

did you figure that issue out ?

 

Mine won't Go into OD or throw the lock ups, I have 12 Volts on OD1 as well. Looking at the Electrical Diagram and FSM for the cruise i believe the 12 V is correct, But i could be wrong