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Dave Nova
Dave Nova, GMC Technician
Category: GMC
Satisfied Customers: 19452
Experience:  ASE Master Certification. GM World Class Certification
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GMC Jimmy 4x4 (Mid Size): why does the ecm fuse keep blowing

Customer Question

why does the ecm fuse keep blowing when I try to start my 2000 gmc jimmy.i checked the pink ignition wire it lights up the test light when in on position but at the end where the connector connects to coil pack the test light does not light up when in on position. please help!!
Submitted: 1 year ago.
Category: GMC
Expert:  Dave Nova replied 1 year ago.
Is it the ECM B or the ECM I fuse that is blowing?
Customer: replied 1 year ago.
Ecm 1
Customer: replied 1 year ago.
It's the ecm 1 15amp fuse.
Expert:  Dave Nova replied 1 year ago.
Does that fuse blow as soon as the ignition is turned ON?
Customer: replied 1 year ago.
Yes it does.
Expert:  Dave Nova replied 1 year ago.
One at a time, disconnect each of the following components, replace the fuse and turn key on. When the fuse no longer blows, you will know which component is causing the short.ignition coilignition module crankshaft position sensorfuel injector main connectorPCM (engine control computer)If none of these components is shorted, inspect the pink wire on the harness near each of these components for damage (pinched or chafed). Let me know if you need additional assistance.

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