A341E Shifting Issue

[mtriples]

So I recently installed an AEM series 2 EMS in my MKIV TT auto, and I've been having some weird shifting issues. Only current mods are the EMS, a wideband, and a catback.

Because I know someone will ask, the transmission works fine with the factory ecu.

When I place the car in manual mode, it doesn't always seem to be able to differentiate between the gear positions...for example, I shift to the 1st gear postion, but the car stays in 2nd, or it stays in 3rd when I downshift to 2nd. And when I downshift to 1st, it takes until the car is almost to a stop until it actually engages. It seems mostly random. It shifts fine on its own if I leave it in auto mode and 3rd gear position, but it does the same thing if I pull it into 1st or 2nd auto mode.

The guy who tuned my car was bitching about this...but he isn't hugely familiar with Supras.

I have a Titan stage 2 tranny on the way, and I'd rather have this fixed before it arrives...any help would be appreciated.

 

[Nick M]

The A341 didn't come in any US market Supras. It is an A340. The 341 was in the Celsior/LS400. Just FYI...

There should be a code with that. The shift solenoids are probably causing the problem. When one fails, it will act a certain way, such as holding a gear.

 

[Devin LeBlanc]

If I remember correctly the A341E came in the Mark 4 TT supra's and the A340E came in the Non turbo Mark 4's. The difference is the line pressure is controlled by PWM via a solenoid instead of the throttle cable.

The late SC400's also came with the A341E

 

[Intense]

mtriples, Did you ever figure out the problem?

 

[mtriples]

Nope. My torque convertor was screwed soon after posting this, car would just free rev in any gear...working on getting a Titan tranny and convertor installed over the winter.