2000 GC 4.7 fuel injector circuit - JeepForum.com
 
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post #1 of 8 Old 07-17-2019, 07:49 AM Thread Starter
gchase
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2000 WJ 
 
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2000 GC 4.7 fuel injector circuit

My jeep keeps blowing fuse 26 (fuel injectors) at very intermittent times. I have spent a lot of hours chasing the wiring and thought I had found the problem a couple times. I went 8 months with no problems and than had it blow twice last week

So I am going to run a new wire to the injectors from the fuse box. My question is does that circuit only go to the injectors or does it power anything else? I have tried to find wiring diagrams for the 4.7 without much luck.

Appreciate any help
Gary

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post #2 of 8 Old 07-17-2019, 09:44 AM
jtec
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fuse 26 in PDC or in cab box?

I am GUESSING #26 in PDC but better to be sure.


GTG
Attached Files
File Type: pdf PDC FUSE 26.pdf (51.0 KB, 4 views)

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 8 Old 07-17-2019, 09:54 AM
Jonee
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2003 WJ 
 
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Hi Gary.

As far as I can tell the only other thing the fuse goes to is the auto shutdown relay output.
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post #4 of 8 Old 07-28-2019, 07:52 PM Thread Starter
gchase
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OK, here is the latest. I ran new wires from fuse 26 in the PDC to the fuel injectors. Found there are two wires off the fuse, one to the injectors and one to C3 on the PCM which tells it we have 12V. So I completely bypassed the 12 volt wire to the injectors and C3. Played around accelerating hard and blew the fuse. I was convinced it was an injector so I replaced all 8 (i had another set so it was free to do). Managed to blow the fuse again. I am at a loss, if the 12volt wire is not shorted and it is not the injectors how can the signal wire to the PCM draw enough current to blow a 15 amp fuse. IF the PCM sent a signal to all of the injectors at the same time it should still not draw more than 15 amps. I have discovered how to make it fall more consistently. I accelerate hard and when it gets to about 5000 RPMs I take my foot of the gas. I even put a 20 amp fuse in and it blew as well.

looking for any ideas, maybe the PCM?
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post #5 of 8 Old 07-29-2019, 04:40 PM
CarlJH
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I would check all the grounds on the engine and around the engine bay, if somethings normal ground has developed a high resistance the electric will try to go somewhere else to get to ground. the 2 favorites for breaking are the braided ones from coils 7 and 8 to the firewall and the exhaust hanger to transmission cross member
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post #6 of 8 Old 07-29-2019, 07:18 PM Thread Starter
gchase
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Thanks, that might would help to explain what does not seem to make sense.
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post #7 of 8 Old 07-29-2019, 07:25 PM Thread Starter
gchase
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Does anyone have a diagram for the Ce connector on the PCM?

thanks Gary
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post #8 of 8 Old 07-30-2019, 05:05 AM
Waterluvr
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Garage
Quote:
Originally Posted by gchase View Post
Does anyone have a diagram for the Ce connector on the PCM?

thanks Gary
Gary you can go here and enter year and model info: http://connectors.dcctools.com/home.htm

You'll find the pinout's under powertrain control C1-C3.
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