20 12 Tianyu sx4 automatic gear is slow in acceleration and upshift.

This may be caused by a malfunction of the shift solenoid valve.

If it is an accidental fault, it can generally be solved by eliminating the fault code or upgrading the program. If the fault is not accidental, the corresponding accessories need to be replaced.

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Slow upshifting of gearbox means that the upshifting speed of the automobile is obviously higher than the standard value, and the engine speed is slightly higher before upshifting, so it is necessary to take the operation method of upshifting the accelerator pedal in advance (that is, release the accelerator pedal for a few seconds and then press it), so that the automatic gearbox can be put into high-speed or overspeed gear. The main reasons for the slow upshift of the gearbox are: the governor is stuck, the forced downshift switch is short-circuited, the computer or sensor is faulty, the throttle position sensor is damaged, the pre-tightening force of the governor spring is too large, the push rod of the vacuum throttle valve is improperly adjusted, and the oil pressure in the main oil circuit or throttle valve is too high.

Once the transmission upshift of the vehicle is slow, it is mainly to repair the vehicle in time. There is something wrong with the gearbox. If the owner doesn't care about continuing to use the vehicle, the whole gearbox may be scrapped seriously. A big reason for gearbox failure is that the valve body is too dirty, which will destroy the quality and friction characteristics of gearbox oil and increase friction and wear. At the same time, sludge will also be produced in gearbox, which will lead to the blockage of valve body and pipeline, and the oil pressure cannot be adjusted smoothly, thus causing gearbox failure.