Is there a way to check the ECM computer for proper voltage

Tiny
SCKMYJUNK
  • MEMBER
  • 1991 CHEVROLET S-10
  • 2.8L
  • V6
  • 2WD
  • MANUAL
  • 234,789 MILES
I bought a 1991 Chevy S10 pickup 2.8 liter V6 2 wheel drive she started blowing the fuse to the ECM I replace the fuel pump fuel relays the injector plugs I also found a chafed wire by the oil pressure switch I fix that now I'm only getting 8 volts to the fuel pump
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Wednesday, August 24th, 2016 AT 5:19 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
The power supply for the fuel pump doesn't come from the ECM. It only supplies ground trigger for the relay.

https://www.2carpros.com/images/external/41927760.gif
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Wednesday, August 24th, 2016 AT 6:37 PM

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