Re: Brand new 2021 Tata Safari | Breakdown on delivery day, problems continue Quote:
Originally Posted by dadu ECU's have been there for almost 2 decades in Indian cars. if the ECU will not switch off the ignition will also not cut, which is a pretty common occurrence. |
I think either you have confused yourself about which ECU I refer to, or did not understand what I explained. When I mention ECU, it stands for Electronic Control Unit, and not Engine Control Unit(which is otherwise also referred to as ECM or engine control module). When you speak about ECUs being in cars from two decades, you must be referring to the engine controller. That was the first ECU in most cars and yes, it came to India around 2000. Hence, your whole assessment is based on this logic.
The Engine controller has come a long way from the past two decades and is usually provided by suppliers like Bosch, Magnetti, Delphi who have mastered the art over the past two decades. Like you say, if the engine controller is faulty, then the ignition(or the engine) would not switch off if its stuck in an active state.
However, my friend, the modern car isnt so simple. The ECM is one of the many ECUs in the car. A car like the Safari could have 10-15 ECUs for various functions of the car. Where I work, we have 100+ ECUs in our vehicles. And the networking is pretty complex. If one of these 15 ECUs in the Safari has an issue, it would drain battery. It could be the infotainment ECU running in the background, with only the display being switched off. It could be the keyless entry controller which is not switched to passive mode. It could be the body electronics controller, which is still active due to some shutdown check which has not happened. Quote:
Originally Posted by dadu Unless this is that 1 in a million case, I wouldn't bet on this  . Let's wait for the TASS to diagnose and we will know, instead of contemplating. |
One in a million case is relatable to random failures of electronics. But if there is buggy software, or an architectural issue which is causing this problem, then that would not be one in a million. Especially when there could be just around 10k Safaris on the road by now at most. After explaining so much, I believe I am not contemplating, but speaking out of experience. As for TASS to diagnose it correctly, I have also explained why it isnt so easy for them to do it. End of the day, they would either end up replacing components by trial and error, or perform some software updates. Quote:
Originally Posted by Kosfactor Isn't there a separate fuel cut off solenoid in place for diesel engines?
Given the right circumstances, a diesel engine does not need injectors either - aka - runaway. . |
The ECU would stop sending injection pulses to the injectors upon shutdown. After this the injectors should not inject fuel. If this part of the software has an issue, then its a problem. Normally the injection pulses are quite complex with more than one injection happening per combustion cycle per cylinder. Hence, its not just a simple ON-OFF command. In a modern diesel engine, say in 2021 this would be the rarest of rare scenario.
Last edited by audioholic : 21st June 2021 at 11:54.
|