help - 5EFE Auto transmission Problem

[atif]

Guys,, 1 thing is confusing me...

if the ECU has nothing to do with gearbox or gear shifting, why do we have different ECUs for different transmissions? like 5E-FE 4WD ----- 5E-FE 3AT ---- 5E-FE 4AT ---- 5E-FE 4MT ??

[wa5]

A motor hooked up to an Auto transmission will typically work differently to one hooked up to a manual (Some motors have different power ratings between "auto" and 'manual" types).

A manual gearbox has a solid coupling to the engine (with clutch engaged) , whereas an auto has a little more "slip". so the engines may run differently (for example) going down hill with the throttle closed.... the manual may require less fuel to keep running smoothly in these circumstances compared to the auto. If the same ecu was used with both transmissions, one may run richer (and there fore use more fuel and create more pollution ) than necessary

The difference may not be only in the ECU, some auto engines have milder cam timing than their manual counterparts (hence less power, but sometimes more Torque in the A/T engines) .

[Gavatron]

The main difference is the ones marked A/T will have the Electronically Controlled Transmission (ECT) circuitry inside to control the transmission. M/T ones do not.

I would assume that the 3AT one, being fully hyrdraulic according to you, would have no ECT circuitry in it, and would be marked this way to avoid complications if there was a 4AT version of the motor with an ECT.