Lexus Rx350 2007
My tranny went bad 4 months ago and was replaced.
The ECU was also replaced with another.
Being told the former ECU caused the damage to the tranny.
Car has been running fine, but recently I have been experiencing harsh shifting from 2 to 3, ie rpm goes up before it engages 3rd gear, ie gear hunting .....then it smoothens out.
Does not happen all the time.
Its not bad, but i think it could be better.

Fluid has been examined and in perfect condition. Drain and fill done with WS, no metal chippings found.
Filter changed.

I have read on lexus forum and many pointed that the ECU might need an update / reflash or recalibration.
Maybe was not programmed correctly or may require firmware update

I need specialist who can do fix to respond asap so I can engage.

Picture of my old ECU - came with car

Thanks

Whynow:
Lexus Rx350 2007
My tranny went bad 4 months ago and was replaced.
The ECU was also replaced with another.
Being told the former ECU caused the damage to the tranny.
Car has been running fine, but recently I have been experiencing harsh shifting from 2 to 3, ie rpm goes up before it engages 3rd gear, ie gear hunting .....then it smoothens out.
Does not happen all the time.
Its not bad, but i think it could be better.

Fluid has been examined and in perfect condition. Drain and fill done with WS, no metal chippings found.
Filter changed.

I have read on lexus forum and many pointed that the ECU might need an update / reflash or recalibration.
Maybe was not programmed correctly or may require firmware update

I need specialist who can do fix to respond asap so I can engage.

Picture of my old ECU - came with car

Thanks

It is hard to say now that the culprit is your computer. Do determine that, a painstaking scoping of the solenoid wires need to be done.

If 2-3 flare (where the engine rpm rises and falls between the shift before eventually completing) is all you have, its in the valvebody. The only snag here is that yours is intermittent.

Kashif:


It is hard to say now that the culprit is your computer. Do determine that, a painstaking scoping of the solenoid wires need to be done.

If 2-3 flare (where the engine rpm rises and falls between the shift before eventually completing) is all you have, its in the valvebody. The only snag here is that yours is intermittent.

If The transmission has not been rest to its adaptive values, I think that should be done first (using a J2534 compliant diagnostic tool).

Thanks for the advise .I am currently out of Lagos.
So my mechanic took the car to a specialist.
First the tranny pan was dropped, after leaking the fluid.
Solenoids checked, no debris and clicking.
Everything else in order.

So new filter installed and filled with brand new WS.

Next test will be the on computer or ECU
I will keep you guys updated.

Inception:


If The transmission has not been rest to its adaptive values, I think that should be done first (using a J2534 compliant diagnostic tool).

That adaptive value reset is neither here nor there. It is recommended, but the vehicle can do the relearn on its own if it has to. If that was the problem, it would have been evident in this case immediately after installation. But it worked for four months before acting up. Our Nigerian mechanics don't know what is adaptive reset, but they still install these gears, and they drive right out of the sheds, and stay out.

If everything works fine mechanically for a U150, it drives fine right off the lift.

Whynow:
Thanks for the advise .I am currently out of Lagos.
So my mechanic took the car to a specialist.
First the tranny pan was dropped, after leaking the fluid.
Solenoids checked, no debris and clicking.
Everything else in order.

So new filter installed and filled with brand new WS.

Next test will be the on computer or ECU
I will keep you guys updated.

I will be interested in knowing how they test the computer. 'clicking' PWM solenoids is not a good way to test them. They are fully driven by the computer, unlike the on/off ones.

Kashif:

I will be interested in knowing how they test the computer. 'clicking' PWM solenoids is not a good way to test them. They are fully driven by the computer, unlike the on/off ones.

Will try to find out. I am returning to Lagos this evening.

Waoo the car is driving and shifting like brand new.
The specialist asked my mechanic to drain and loosen the tranny pan, after which he asked him to allow him to check the inside of the gear , or valve body/solenoid/ systems.

According to my mechanic, he had no idea of what the specialist did after spending some minutes underneath the car , and all he asked of him was to get a new filter and fill with 4qtz of brand new WS.

Brothers, even my mechanic is in disbelief because the car drives differently as to when he took it to specialist @ Ladipo.

The specialist till today has refused to tell him anything, and requested to speak with me directly, maybe to ask me for more money.

Friends, what magic do you think was performed?