An automatic transmission is very complicated compared to the manual gearboxes because of the control and all operating functions apart from the gears. But they are very less likely to show problems in comparison to the manual counterparts. It is because of a huge number of parts inside the gearbox and many of the faults are caused by more than simply one component.
The first check should always be carried out on the transmission fluid level and also be checked in what condition it is. If it is functioning all right, then you should proceed to other parts. Here are things which you should watch for while doing automatic transmission diagnosis:
1. Reliability: The most important reason behind the reliability is the engagement of the automobile gears and this why it functions very smoothly. The internal clutches function perfectly and the brake hands also remain under automatic control, thereby decreasing the possibility of bad treatment, gear crashing, mechanical destruction, and shock loading. When issues come, they are caused because of the external linkages or maybe less fluid level and can be easily deal with without string the transmission. Finally, any internal transmission fault should need special equipment and maintenance from time to time.
2. Engine Checks: When there is a close link between the engine and the transmission then it becomes difficult to perform an automatic transmission diagnosis. So, before you point out the transmission for giving a bad performance, you should check out the engine at first whether it is in the good tune or not. Sometimes there are bumpy starts and some shifts in gear; this can be because of the high engine idle speed.
3. Overheating: During automatic transmission diagnosis, if you think any overheating has occurred, then you should check the ventilation openings present in the torque converter. Check whether it has become blocked up and based on that you should consider cleaning them by using an engine cleaner. Where there is an oil cooler, ensure that the hoses to and one coming from the transmission are connected perfectly. Also make sure to check whether the radiator is blocked and if it so, clean it carefully using a paintbrush and a degreaser.
4. General Checks: One of the most common reasons behind the trouble we face with an automatic gearbox is the wrong fluid level. If it contains the wrong level of fluid in it, you are required to do a test for discovering whether the issue is in the gearbox or the engine or the torque converter. If there is a general lack of performance along with weak acceleration as well as bad hill starting, it can be because of fault in the torque converter. In some of the models, it is still possible to diagnosis the converter by performing a stall test, even though this is not suitable in every case.
When the engine is in running condition and you are there for automatic transmission diagnosis, you should, at first, apply the footbrake, choose the low gear and completely depress the accelerator so that the engine starts revs up. Continue with this till the revs stop rising. By making use of a precise rev counter, keep a note of the engine speed. Leave the accelerator and turn the selector to neutral. Also, do not keep the transmission in hold condition for a period of more than 10 seconds or it may lead to some serious damages.
Now comes the main part of the automatic transmission diagnosis. Make a comparison of the stall speed with that of the specified value. If the reading comes below the specified value, it means the engine is out of tune, but if the reading is very low then its converter fault. A very high stall speed means there is an issue with the fluid supply to the converter or maybe internal fault in the remaining transmission.
With these important steps in automatic transmission diagnosis, you can be able to find out the major issues and get an effective solution for it by visiting a professional mechanic.
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