When in Doubt, Reset

Thistransmission使用线性EPC和换档螺线管。这意味着可以像EPC一样调制换档螺线管。ECM学习并调整应用特征，类似于604或4T65-E. Like a 604, the old values must be cleared when the transmission is rebuilt. Disconnecting the battery for 5 minutes can reset most models up to 1999. Many later models can only be reset with a scanner. So far, the Toyota scanner appears to be the only one capable of performing this operation. Most of you know by now that if you don’t reset or “Quick learn” a 604 after rebuild, shift quality can be terrible. If you don’t reset the ECM on one of these, you may find yourself taking the unit back apart, looking for what you did wrong.

One thing you may notice during your first pass or if you go back inside is the direct clutch (C2) sealing rings. These units use plastic (peak) sealing rings with an interlocking joint similar to the late4L80戒指。差异是丰田环具有锥形侧面，绝对没有向外张力，以保持它们与孔壁接触。事实上，他们有内心紧张。如果解锁它们并让他们互相绕过它们，它们将重叠大约十六分的一英寸。当试验安装在钻孔中时，它们就会落入。您可以在钻孔墙和戒指之间看到日光，当您空气检查离合器时，您可以在终于弹出位置并密封之前将它们涂上泄漏。忘记密封戒指所学到的一切：他们很好。不要担心。一套完美的手工配合Teflon®对接间隙环不会在单位偏移的方式中产生一些差异。相信我。我试过了。

So now you’re wondering what the heck burned the direct clutches, right? Well, it’s possible that the solenoid code actually was caused by a bad shift solenoid and that it burned the clutches. Another possibility is that the car has a defective ECM. Toyota Technical Service Bulletin TSB TC002-06 may well describe exactly what the car came in for. It tells you to replace the ECM and if that does not fix the problem, replace the transaxle. (Please note that the ECM replacement may be covered under extended emissions warranty if the vehicle has less than 96 months or 80,000 miles on it.)

Considering the ECM costs about $900, I suggest that, unless the warranty is going to pay for it, you forgo this option until you’ve had the ECM reset and see how it works. I’m here to tell you that the results can be dramatic, to say the least.

2.Scan for codes, test and/or replace solenoids if needed. (see VB solenoid diagram) Then take it to Toyota and fork over the hundred bucks or so they want for the five minutes it takes to hook up and reset the ECM.

4.If the reset or ECM replacement does not fix the problem, then the transmission is probably mechanically damaged. Bear in mind that it is possible to remove the side cover and R&R the direct clutch drum through the left wheel well. If the clutches are burned, you may well be doing the customer a favor by going for the whole overhaul because these units also have a problem with premature wear on the front planet pins with subsequent planet failure. Remember, if you drove it a lot with bad clutches after the ECM was reset or replaced, you may have to reset it again after overhaul.