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Discussion Starter · #1 ·
Hi all and Merry Xmas,

just got a 2002 trailblazer 4.2 4 months ago

i was driving 2 days ago and the engine just turned off
all electrical works, the dashboard and all, but truck don't crank,

so i checked my fuses and fuse 28 ( PCM1 ) was blown
i replaced it, the truck cranked, turned on for a second and shuts down
PCM fuse blew again

I watched a video on youtube about some guy who says that most of the time is the fuel pump who shorts or the fuel pump cable

Soi removed the fuel pump relay ( micro relay 41 ), replaced PCM fuse ( fuse 28 ) and the fuse don't blow

That leads me to think is the fuel pump,
is there any more tests i can do?
fuel pump is around 100 to 140
i do not want to buy one, replace and find out that is something else

Thanks
Rolo
 

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2002 chevy trailblazer_ltz
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External fuel pickup pump test. Unprofessional advice, but advice at the very least.
 

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Discussion Starter · #6 ·
ok so the problem was the fuse pump relay,
as soon i replaced that one, the PCM1 fuse do not blow anymore and i have
my TB running again ;) :D
 

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Discussion Starter · #9 ·
But why was the relay blowing
IDK, but as soon i replaced that relay, all was good, indeed in the schematics the fuel circuit shares power with the pcm circuit, so i think that the relay was shorted or something, and blows the pcm, idk for sure but that fixed the issue, that was a royal PITA :D
 
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