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AM2 Fuse keeps blowing

Tiny
ADM_20077
  • MEMBER
  • 2001 TOYOTA COROLLA
  • 150,000 MILES
My Corolla's AM2 fuse keeps blowing, and when I replace it the engine will start up, but then the fuse will blow. This leads me to believe that there is a shortage of some sort but I don't know exactly where. I would like to know where the AM2 fuse leads to? And where to look
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Sunday, July 14th, 2013 AT 1:56 PM

7 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
There is a short in the system and the diagrams shows all the components that are linked to this fuse. You need to be checking for faults with these. Try pulling all of the lower fuses and installing them one at a time until you find the fuse that blows.

If any repairs was carried prior to this, check the area around them. Check wiring harness for damage.
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Sunday, July 14th, 2013 AT 6:17 PM
Tiny
ADM_20077
  • MEMBER
  • 2 POSTS
Thank you I have been looking for the diagram and wasnt able to find it
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Sunday, July 14th, 2013 AT 8:56 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
You're welcome and good luck
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Monday, July 15th, 2013 AT 7:35 AM
Tiny
BKPO2003
  • MEMBER
  • 1 POST
Referring to diagram: am I wrong in thinking the fault would not be found in any of the 3 blk/org wired circuits (F4, A4, J8) that are south of the 7.5 amp IGN fuse? IOW, wouldn't the IGN fuse blow first, and therefore prevent AM2 fuse from blowing?
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Tuesday, September 22nd, 2015 AT 10:25 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Any fuse of lower rating should blow first before the higher rated ones.

It makes me think the short is in the ignition switch itself.

Please run some tests and get back to us so we can continue helping you.

Best, Ken
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Thursday, December 29th, 2016 AT 6:36 PM
Tiny
DADDYHERB
  • MEMBER
  • 6 POSTS
2carpros Ken, I have the same problem he did. My am2 fuse keeps going. I have a 1998 Toyoto Camry, 4 cylinder. I have unplugged the coil packs, unhooked the alternator and starter. One at a time and still blew the fuse when I tried to start it. I replaced the ignition switch yesterday, only to want to pore gas on the car and throw a match at it. Still blew. I've traced all the wires the best I can and can not find a bad spot in any of them. Any ideas?
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Monday, June 19th, 2017 AT 10:37 AM
Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
How many fuses have you gone through so far? Here's a better approach. A simple trick to finding a short is to replace the blown fuse with a pair of spade terminals, then use small jumper wires to connect them to a 12 volt light bulb. A brake light bulb works well. When the circuit is live and the short is present, the bulb will be full brightness and hot so be sure it's not laying on the carpet or against a plastic door panel. Now you can unplug electrical connectors and move things around to see what makes the short go away. When it does, the bulb will get dim or go out.
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Monday, June 19th, 2017 AT 10:17 PM

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