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1999 Express 3500 5.7


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GH3
New User

Apr 25, 2008, 6:07 PM

Post #1 of 4 (1714 views)
1999 Express 3500 5.7 Sign In

I have a code P0102 that will not go away. I replaced the mass flow Sen and it still comes back the second you turn on the key. Please Help.


Double J
Veteran / Moderator
Double J profile image

Apr 25, 2008, 6:53 PM

Post #2 of 4 (1708 views)
Re: 1999 Express 3500 5.7 Sign In

Did you clear the code from memory after replacement of the MAF?

If not,clear the code...then test drive it and see if it returns.

If so,suggest looking closely at the MAF wiring/connector for any broken/frayed wires.
Also look for any air leaks at/near the MAF..

Just some suggestions

Let us know

Jim


GH3
New User

Apr 26, 2008, 4:47 AM

Post #3 of 4 (1704 views)
Re: 1999 Express 3500 5.7 Sign In

Yep I did that. I will clear the codes restart the truck and the ck engine light will go out BUT when I turn it off and restart it the code comes back on.


GH3
New User

Apr 29, 2008, 11:27 PM

Post #4 of 4 (1687 views)
Re: 1999 Express 3500 5.7 Sign In

Well I found the problem. The computer was only putting out 2 volts on the low side of the curcit, it has to be 5 volts . I replaced the computer and the fault code is gone.






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