Mechanics

WHAT PARTS I NEED TO CHANGE IN AVTOMATIC TRANSMITION?

2001 Mitsubishi Other • 88,000 miles

Pajero Mini H58A 4wd - MRPF V (Turbo), 4FA/T
About problem: A/T had kick on change from1 to 2set, and from2 to3 the changes had made on high and free rotation without kick.I changed A/T oil in to the Service, but did not change OIL FILTER, A/T VALVE BODY.
Now A/T had kicks only on cold engine and on hot engine seams A/T works OK.

I need your advise.

Tanks,

Gegi Nikolashvili
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Gegi Nikolashvili
January 17, 2012.




Scan the computer for code/s if none bring it in and have it checked by a transmission specialist

Tiny
Rasmataz
Jan 17, 2012.
I am interested what kind of parts may be damaged in to the transmition.

Tiny
Gegi Nikolashvili
Jan 17, 2012.
I have Scaned the computer for code/s and seems none is in.

Tiny
Gegi Nikolashvili
Jan 17, 2012.
The most common cause for such problems are the valve body. It could be the solenoids are working inconsistently or the valve body requires rebuilding.

KHLow2008
Jan 17, 2012.
If solenoids are working inconsistently, then computer diagnostics should be detect this. And further this if solenoids are failure, then why A/T does not kick and does not slip when engine becomes hot?

Tiny
Gegi Nikolashvili
Jan 17, 2012.
Inconsistent solenoid does not necessarily trigger trouble codes. The voltage are correct, just that the solenoids might be slow to response.

Some components tends to stick after parking and would free sup after some running. The fluid change made some differences, and that is one of the indication of the fault with the valve body, on which the control solenoids are located.

What scan tool did you use for checking the transmission trouble codes? I usually have problem using my scan tool to check for trouble codes on Mitsubishi vehicles and only manual retrieval would produce codes.

KHLow2008
Jan 17, 2012.
Thenks

Tiny
Gegi Nikolashvili
Jan 17, 2012.
May A/T solenoids work proper when ATF is warm and work wrong when ATF is cold?

When Car starts moving speedometer reacts later (shows 0 kmph when car speed is 5-7 kmph). May A/T speed sensor failure cause jog moment of shifting from 1 to 2, when ATF is cold?

Tiny
Gegi Nikolashvili
Jan 18, 2012.
Solenoids can work sluggish during cold fluid temperature and perform better when it warms up so it is not surprising to have the transmissuion working well only after warming up.

Abnormal cold trans fluid temperature erratic operations can also be due to fluid line pressure loss cause by worn/aged clutch sealing rings.

Incorrect speed sensor readings can cause harsh or erratic readings but at speedometers might not show accurate readings at very low speeds. Is your vehicle equipped with cable driven or electrical controlled vehicle speed sensor?

One thing you can try, check engine to body ground circuit connections, ensure they are clean and tight. When ground circuit connections deteriorates in capacity, they can cause abnormalities with engine and/or erratic transmission operations.

Harsh shifting and slipping are mostly due to faults with the valve body/solenoids but you cannot rule out pressure leakages.

If the harsh shifting has a temporarily pause as if there is temporary loss of contact before gears engaging, it could be due to pressure loss, meaning a fault with the trans and requires a rebuild.
AD

KHLow2008
Jan 18, 2012.

AD