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ECU fuse keeps blowing

Tiny
TMFILM89
  • MEMBER
  • 2005 KIA RIO
  • 4 CYL
  • AUTOMATIC
My car will not start and it keeps blowing 10 amp ECU fuses. I think it might be a burnt wire because I know my ECU is fine.
Thursday, March 10th, 2011 AT 10:59 PM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You have a short circuit in the ECU wiring or the components it powers-time to trace the circuit.

Heres a guide on using a volt meter, it will help you check for a short to ground

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

The wiring diagrams for the ECU are attached below, check for sorts in the power wires from the fuse
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Thursday, March 10th, 2011 AT 11:12 PM
Tiny
D2EJH
  • MEMBER
  • 1 POST
  • 2003 KIA RIO
  • 2WD
  • MANUAL
  • 67,000 MILES
I have an 03 Kia Rio approx 67,000 miles - The problem is that the 10amp ECU fuse keeps blowing. I am having to replace up to 5 times per journey as when the car is slowing to a standstill or is at standstill or just set off from lights, junction, roundabout, parking space etc it just blows the fuse and the car stalls. Once fuse replaced it starts and sets off OK (for a while!). Is this a common fault with the Rio?
What is the problem and is it expensive to fix?
TIA
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Tuesday, April 2nd, 2019 AT 5:11 PM (Merged)
Tiny
PROMECHANIC
  • MECHANIC
  • 536 POSTS
Most of the time this is a problem with the wiring to the ECU or the ECU itself. I would start by inspecting the wiring that goes to the ECU.
If you replace it I would recommend buying a used one as you can get them much cheaper.
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Tuesday, April 2nd, 2019 AT 5:11 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 2002 KIA RIO
  • 113,000 MILES
What causes 10 amp ECU fuse to blow
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Tuesday, April 2nd, 2019 AT 5:11 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Most of the time when you have a ECU fuse blowing is because one the oxygen heaters has shorted to ground. Start by unplugging the sensors and then replace the sensor when the fuse doesnt not pop anymore. Here is a guide to help you get the job done.

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Please let us know if you need anything else to get the problem fixed.

Cheers

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Tuesday, April 2nd, 2019 AT 5:11 PM (Merged)
Tiny
NEMESIS1075
  • MEMBER
  • 0 POST
Wow so good! You hit it on the money I found the sensor behind the cat that was causing the problem and the car runs great. I love this site.
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Tuesday, April 2nd, 2019 AT 5:11 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Thanks for using 2 car pros come back any time
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Tuesday, April 2nd, 2019 AT 5:11 PM (Merged)

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