Re: Hyundai India - The occasional serious quality lapse and apathetic manufacturer response! There was an individual thread (Reliability issues with my Hyundai Santro AMT) on Hyundai Santro's issues with its AMT gearbox . I think that I should keep a summary of that discussion here, so that the information is available at one single place. This might also be of help for owners of some other cars which uses the same gearbox, like Grand i10 Nios and Aura too. The problem:
There was an infrequent issue where the gear did not shift from N to R or D. But whenever the issue occurred, it usually got rectified after about 10-15 minutes of trying, sometimes more. The problem was of a serious kind, as it rendered the car immobile. Quoting below: Quote:
Originally Posted by BhaskarG
...And now the car refused to go into Drive mode from R. Whatever I do, the car remained at N for a good 40 minutes. It was almost midnight and I was stranded in the middle of the road. Fortunately, it slotted into D after 40 minutes and I could drive back home.
Visited Hyundai Workshop next day and they could not diagnose anything in their system diagnostic software. | Solution:
Bhpians correctly diagnosed, and offered very sensible solutions to the problem. Mostly, it was agreed that it is a battery issue. Quotes: Quote:
Originally Posted by arjab ... AMT's are very sensitive to voltage drops and even a minor drop in voltage will lead to all sorts of complications as the actuators do not get sufficient voltage to "work". And the Hyundai AMT unit is an electrically operated unit. | Quote:
Originally Posted by varkey Something similar happened to my sister's Santro Sportz AMT (same 2019 model) as well.
...
Apparently the AMT is heavily dependent on the battery even while the car is running. If the battery is not able to handle the surge or voltage drops, it affects the AMT it seems. The battery was only 3 years old, vehicle was purchased in early 2019. | Diagnosis at the workshop:
There went a lot of trial and error troubleshooting for the AMT issue. The car was taken to different ASCs hoping for a better solution. However, no solid reason could be provided. However, almost all agreed to be a battery issue. Quoting: Quote:
Originally Posted by BhaskarG - They checked for any sensor-actuator issues with their diagnostic tools. They actuated the actuators via software simulation, and it was a interesting thing to know for me. No issues detected.
- They checked for error logs, and found one. I do not remember what the log was, but the manager told me that it was not related to the issue.
- They lifted the car up and checked for mechanical issues (checked the gear oil, as far as I understood). Found OK.
- They took apart connectors to sensors and actuators, cleaned them and reinstalled. They say that this should solve the problem. Let us see.
| The final update:
The car is behaving fine now, but I found that whenever the shifts happens, it requires a good amount of power. Hence, there are some things to be noted while driving an electrically actuated AMT: - Check battery health frequently.
- Do not drain the battery.
The following lines sums up my experience. I am not a technical person. Maybe someone from technical background can provide a better insight. Quote:
Originally Posted by BhaskarG The Hyundai's AMT unit is electrically actuated, against Tata and Maruti's hydraulic units. So the shifts are super fast. Now there is a downside to this. Whenever the shifts happens, it requires a good amount of power. And hence the battery needs to be in charged condition. What I found out is that whenever you drain out the batteries (like using the ICE without the engine running, keeping the lights on etc) there is a small probability of this (incomplete shifts) happening. It automatically corrects itself when batteries are sufficiently charged, that is, after keeping the engine on for sometime. This explains why this problem gets corrected after trying for 10 minutes or so. Service centre technicians were initially puzzled, but later they found that issue was with the battery only.
I even put this to test. Keep your headlights on, and try to shift from D to R and back to D. You will observe that your headlights will dim when the shift happens. (Maybe not if battery is brand new). So, my take home gyan from this incident is that if you drive AMT with electric actuators, DO NOT drain your battery. |
Hope this helps all other owners out there. This is just a simple precaution that we need to take. Even if it happens, just we need to keep the engine on, and let the battery charge a bit.
Keep revving!
Last edited by BhaskarG : 24th May 2022 at 16:14.
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