73-87 Chevy _ GMC Trucks > Electrical
ECM 1 fuse blowing 1987 chevy
Yellowcat:
Have a 1987 chevy tbi 350 which was blowing the ECM 1 fuse soon as I turned ignition key on. It done it a few times but now I driving it for a week an nout blowing fues. What components are running on this one ECM 1 fuse? I need to trace all these wires going out from the ECM 1 fuse?
Yellowcat:
photo of fuse box
VileZambonie:
Does it have an AIR pump? EGR Solenoid or EGR Vacuum Regulator? Not enough info on you truck but see the attached.
Yellowcat:
It has smog air pump if that what you mean. I just got stranded on the road again today. As soon as I turn key on it blows ECM 1 fuse please help tell me which items are going to this fuse.
bd:
In order to help you, we need your help.
Remove the air cleaner and snap pictures of the engine from either side and front then snap a full-frame picture of the Vehicle Emission Control Information (VECI) label affixed to the radiator support or air cleaner housing. Post the pics. This will show us the emission control configuration and many of the electrical appliances powered through the ECM I (ECM Ignition) fuse.
GM routinely color codes ignition power feed (I+) wiring pink with black tracer (PNK/BLK). All of the wires protected by the ECM I fuse are color-coded PNK/BLK, designated on wiring diagrams as circuit 439 (CKT 439). However, not all PNK/BLK wires are protected by the ECM I fuse. Some PNK/BLK wires are protected by other fuses and carry different circuit numbers. In other words, all ECM I wires are PNK/BLK, but not all PNK/BLK wires are ECM I wires. This will become important as you troubleshoot.
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