Am2 fuse keeps blowing

2002 TOYOTA COROLLA

140,000 MILES • 1.4L • 4 CYL • 2WD • MANUAL

CKSBRAT2002

MEMBER
1 POST

I have put in a new ignition switch and spark plugs. It jerks and jolts when you drive it and seems to run about a week and then the fuse blows. any insight would be most helpful.

Apr 3, 2019 at 9:54 PM

SCGRANTURISMO

✓ASE Certified Mechanic
4,897 POSTS

Hello,

This sounds to me like you have got a wiring problem in the wire going to the Engine Control Module (ECM). You will need to do a Voltage Drop Test on this wire to make sure there is no unwanted resistance on it. If none is detected then you probably have a internal problem with your vehicle's ECM. To do a voltage drop test you will need to have your vehicle running and you will need to have a multi-meter and have it set in DCV 20V setting. Place one test probe in the connector highlighted and the other in the other one connector that is highlighted. To do this you will need to back-probe the cavity with the black wire with the red stripe. You should have no more than .01V on the multi-meter. I have included a wiring diagram for you in the diagrams down below. Get back to us with what you find out.

Thanks,
Alex
2CarPros

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Apr 3, 2019 at 11:03 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.