Automatic Transmission Specialist in Karachi

[dani_kk]

This could be the difference of tire profile

[Xulfiqar]

You are experiencing tcc lockup, but the speed/rpm pictures make me believe you have a celica model differential in the gearbox, it makes the engine spin at higher rpm. (Better acceleration though)

[mohsin-212]

But atleast NT and RPM should be same at lockup

[Xulfiqar]

It wont be 100% same, it will only be 90 to 95% of NE . This was done by toyota in the mid 90s with the introduction of obd2 monitoring, 100% lockup induces a vibration at lower speed which can oscillate the NE reading and make the engine detect it as cylinder misfire.

Obd1 has no detection for running misfire from the crank sensor.

The manufacturers which have 100% lockup provision then have an adaptive damper built into the torque converter or flex plate to prevent harshness from registering at the crank sensor.

[mohsin-212]

But it is not even 90% . I read in a manual that if RPM-NT>35 then CEL will come on. Is there any possibility of faulty ECM??? Or should I try to reflash it??

[mohsin-212]

Can you share it's specific model number (celica gear) which you are referring to???

[Xulfiqar]

let me try to find it - the only difference in the celica box is the transfer gear and differential. It makes engine spin at higher rpm but has better acceleration due to it.

[mohsin-212]

The stock U341E transmission has following gear ratios
final drive 4.234
4th gear 0.7
Source is internet

[Xulfiqar]

Yes, one variant of it has a different diff, I ran into it once, it was a celica unit

Those cars have been crushed long ago too, very old

[mohsin-212]

I have also doubt on ECU as it's not giving any slip code when there is TCC slip of 400 and ECU has commanded Lockup. Will reflashing ECU fix it??

[mohsin-212]

@Xulfiqar Sir is it possible to activate TCC solenoid in standing still Matlab kharri gaarhi may ??? If someone slide below transmission pan and hear for clicking sound when activated from Scanner is it possible???

[Xulfiqar]

Yes, its possible
Do ohm test first though

[digitalhassan]

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[bilalawan774]

@Xulfiqar @capsat @dani_kk .
brother, i have made purchase decision its 2007 Altis with U341E, the problem is it has winning sound the owner confirmed he hit the gear pan lost some fluid, also the shifting from 2 to 3 is jerky at low RPM, the TCU is throwing P0773 code, the transmission is stock and the odo clocks at 260K,

Please suggest if i proceed with valve body service and oil pan dent removal may be the pump is not getting full oil or shall i proceed with replacement since it has done its life

[Xulfiqar]

Is the dent still there?

[hasankhurshid29]

How much did it cost you?

[bilalawan774]

dent removed with soft hammer, refill KIXX ATF and winning noise is gone,
the only thing is jerk in gear shift from 3rd to 4 or may b the TCC launch is jerky couldnt figure out
its doing 100 at 2700-2800 RPM, does it has TCC engaged ?

[Xulfiqar]

use scan tool to see if tcc is engaged, - you can also literally feel the TCC lockup on toyotas.

[mohsin-212]

2000 RPM @ 80kph
2500 RPM @ 100kph
3000 RPM @ 120kph
Altis 1.8 U341E Transmission

[bilalawan774]

mine does 2700 100KPH, the scanner is not showing TCC lockup turned on