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ECU faulty

Tiny
ALROY DSOUZA
  • MEMBER
  • 2009 HYUNDAI I30
  • 1.4L
  • 2WD
  • MANUAL
  • 72,000 MILES
I bought this car on the 9th of December worked fine the first day, did not drive for two days and battery was flat on the 11th of December. Battery was flat so replaced it. After replacing battery drove the car but broke down. Brought it to the mechanic, mechanic diagnosed a faulty crankshaft sensor and replaced car still would not start, new battery was also flat after two days. Mechanic suspects an ECU fault. Got a replacement battery and battery has not been drained but car will not start. Do you think that the ECU is draining the battery? Could the car have had the issue before the purchase?
Thanks in advance for any replies.
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Sunday, January 6th, 2019 AT 9:52 AM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

It is possible but the ECU is one of many components that can cause the drain.

I attached a guide on how to check the parasitic draw test for draining the battery.

https://www.2carpros.com/articles/car-battery-dead-overnight

Roy
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Sunday, January 6th, 2019 AT 10:21 AM
Tiny
ALROY DSOUZA
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  • 5 POSTS
These checks were performed by me first and also later by a mechanic. However none of these errors were found. The dealer is denying me a refund as the car was running when it was sold to me and the fault occured while I was using the car.
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Sunday, January 6th, 2019 AT 10:28 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What were the results of the checks?

What was the current draw on the battery?

Roy
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Sunday, January 6th, 2019 AT 10:31 AM
Tiny
ALROY DSOUZA
  • MEMBER
  • 5 POSTS
I did not have access to a voltmeter so I just checked around for anything that may have been left on. The mechanic pulled out fuses to check for a draw. He did not tell me what the draw was he just said that the ECU was faulty and that is why the battery was draining. After driving the car he said that the ECU could have overheated and led to the non - runner issue.
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Sunday, January 6th, 2019 AT 10:34 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Does not sound right at all. Sounds like a guess.

I suggest you get another opinion. This does not sound right at all.

Roy
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Sunday, January 6th, 2019 AT 10:36 AM
Tiny
ALROY DSOUZA
  • MEMBER
  • 5 POSTS
I am in the process of rejecting the car but the dealer will not accept as it is a non - runner. It is his own mechanic that diagnosed the problem.

Another question.
Is it possible for a battery to just randomly drain after two days? The dealer is claiming that the car was fine before I bought it.
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Sunday, January 6th, 2019 AT 10:39 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No, something has caused it to drain. If you leave the car alone, the battery should hold for about two weeks.

I do not know what to tell you about the refund. It depends on your contract.

Roy
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+1
Sunday, January 6th, 2019 AT 10:55 AM
Tiny
ALROY DSOUZA
  • MEMBER
  • 5 POSTS
Thanks for your help. I may take it into Hyundai to get a diagnostic report.
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Sunday, January 6th, 2019 AT 10:57 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Sunday, January 6th, 2019 AT 11:03 AM

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