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2005 Pontiac Grand Prix 3.8L

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Old 08-17-2023, 10:07 AM
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Question 2005 Pontiac Grand Prix 3.8L

Good morning guys
I am looking for information on the fuel system. Specifically the wire color and voltages that I should be getting at the bulkhead connection in the trunk. I have had multiple issues recently with the fuel system, the car threw some codes related to the MAP sensor, the MAF sensor and the TPS and once I got that fixed the fuel pump took a nose dive. I have since put in 3 new fuel pumps the first two were Carter fuel pumps. The last one is a Delphi and it does work, I confirmed that it does push fuel through the line. the minute I plug the fuel tank harness in to the bulkhead connector I get nothing.

At first (because of availability) I back probed the bulkhead connection with a powerprobe III and I got what sounds like data being sent or recieved. I check the same wire again and there is 5 volts but its not consistant.


Any help is greatly appreciated
Justin
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Old 08-17-2023, 01:43 PM
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Be nice to know the codes. What is fuel pressure?
A wiring diagram would be helpful.
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Old 08-17-2023, 03:52 PM
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p01008 and p03006 I think
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Old 08-17-2023, 03:56 PM
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*P01006
and fuel pressure with direct voltage is close to 60 psi
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CathedralCub (08-17-2023)
Old 08-17-2023, 05:50 PM
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Those are not codes for your (any) vehicle. What tool?
What do you mean by direct voltage for fuel pressure. Put a gauge on that thing.
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Old 08-17-2023, 08:16 PM
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I agree with carfixer007 ^^^^^^^

If I'm guessing right, you added an extra zero in the middle of those codes, so:

P01006 = P0106 = MAP sensor issue
P01008 = P0108 = MAP sensor issue
P03006 = P0306 = Misfire on cylinder 6

If I'm right about this, then these codes have nothing to do with a no fuel pump issue.
Old 08-18-2023, 01:39 PM
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You are correct about the extra zeros. Code ref the misfire was a typo
I believe my TPS module has failed. Currently testing
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Old 08-18-2023, 01:50 PM
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By direct voltage I applied a ground and voltage to the fuel pump
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Old 08-18-2023, 09:22 PM
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Originally Posted by JHKling
By direct voltage I applied a ground and voltage to the fuel pump
That is fine to see if it runs but not a valid test for how much pressure it can produce.
These are easy to test. We need to verify the pressure.
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Old 08-20-2023, 05:24 PM
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I went and bought a scanner and figured it out. My throttle body is malfunctioning.

Thanks fellas
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