1999 GMC Savana eng I fuse

Tiny
C5.0VORTEC
  • MEMBER
  • 1999 GMC SAVANA
  • V8
  • 2WD
  • AUTOMATIC
  • 135,000 MILES
My 5.0 vortec keeps poping the eng I fuse what is powered by that circuit?

thanks
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Sunday, August 2nd, 2009 AT 2:58 PM

6 Replies

Tiny
JDL
  • EXPERT
Hello, my info shows 02 heater circuits. If you could check codes, it might tell you which one. You could unplug the sensors, one at a time.
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Sunday, August 2nd, 2009 AT 3:16 PM
Tiny
C5.0VORTEC
  • MEMBER
Right now I got all three o2s unplugged and still pops also have the evap purge unpluuged and a bunch of other stuff just trying to get an idea but still nothing I'll try and trace the wires I dont have a scanner so I cant look for any codes
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Sunday, August 2nd, 2009 AT 3:32 PM
Tiny
JDL
  • EXPERT
Also the crank sensor--maf sensor and the evap system you were talking about. Does the fuse blow before or after you turn on the key?

You might could leave the fuse out, do an ohms test from circuit side of fuse, dead, to the other end of voltage wire for whatever circuit your testing, maybe the problem circuit is open? Like hunting a needle in a haystack. You could also separate each branch from the main circuit, one at a time, use an inline fuse or circuit breaker with a jumper to battery voltage, see if one of the circuits will blow the fuse or throw the breaker. Sure sounds time consuming. I can't think of anything else.
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Sunday, August 2nd, 2009 AT 4:15 PM
Tiny
C5.0VORTEC
  • MEMBER
If key is not turned it wont blow but as soon as you turn it to the run position it pops with and without cranking it

I checked for continuety in the o2 plug the right side has cont to ground in 2 of the 4 terminals and the left side has no terminal with cont to ground this is with out the key turned should any of the wires going to the o2s be grounded?
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Sunday, August 2nd, 2009 AT 4:28 PM
Tiny
C5.0VORTEC
  • MEMBER
Well I couldnt find any obvious damage to the wires so I unplugged the computer so eliminate that half of the circuit and well it still pops the fuse
do you know of anywhere to get a good wiring diagram for free
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Sunday, August 2nd, 2009 AT 5:22 PM
Tiny
JDL
  • EXPERT
I've never checked 02 sensor voltage wires with engine turned off, don't know if one of those circuits would show ground? The back wire on each 02 sensor should show ground, that is ground for the heater circuit. One of the wires for each sensor signal circuit, does show a ground symbol, I've never checked it the way your doing.

The autozone site has free wiring diagrams, you'll have to register your vehicle, it is free.

Also try www. Showmetheparts. Com/airtex/ when the site comes up, click on technical resources. It will ask for y--m--m just follow the links. It is mainly engine wiring and component locations. I don't know if I'm supposed to post links to other web-sites on this forum. This post may get erased. I have no connection to those sites.
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Monday, August 3rd, 2009 AT 9:32 AM

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