Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

1996 Ford F 150 4.9 L6

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7 years 1 month ago #7008 by Ben
Replied by Ben on topic Re:1996 Ford F 150 4.9 L6
[IMG


These are probably what your looking at

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7 years 1 month ago #7223 by Ben
Replied by Ben on topic Re:1996 Ford F 150 4.9 L6
Did you have any luck fixing your fuel pump issue?

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7 years 1 month ago #7242 by toadyboy1957
Replied by toadyboy1957 on topic Re:1996 Ford F 150 4.9 L6
i checked powers at the PCM all powers are good but no grounds AND the orange blue wire is dead inside the PCM

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7 years 1 month ago #7245 by Ben
Replied by Ben on topic Re:1996 Ford F 150 4.9 L6
Are you saying you are missing grounds to pcm?

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7 years 1 month ago #7246 by toadyboy1957
Replied by toadyboy1957 on topic Re:1996 Ford F 150 4.9 L6
only 1 ground from battery negative to thr ground terminal to pin 104 oh PCM no operational grounds otherwise i have checked thus far all takes time as you know dont want to condemn PCM TILL IT HAS BEEN ALL CHECKED AND VERIFIED

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7 years 1 month ago #7247 by toadyboy1957
Replied by toadyboy1957 on topic Re:1996 Ford F 150 4.9 L6
I have no grounds to the 3 solenoids i was asking about earluer i have no grounds to the 3 heated o2 sensors no ground for this orange nlue fuel pump control wire i have ground to the PIP wire for the ignition and i have ground to the TPS IAC and the ground i have provided for the fuel pump relay to make iyt run all powers and grounds are good to all lighta and accessorues other than that

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7 years 1 month ago #7248 by Ben
Replied by Ben on topic Re:1996 Ford F 150 4.9 L6
Ok I'll get you a full diagram and ground locations a little later

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7 years 1 month ago #7264 by Ben
Replied by Ben on topic Re:1996 Ford F 150 4.9 L6
Here are the ground locations I'll get the ECM diagram shortly

[IMG


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7 years 1 month ago #7266 by Ben
Replied by Ben on topic Re:1996 Ford F 150 4.9 L6
Pin 25 blk/lt blue is g104 it looks like the rest of them ground at g101

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7 years 1 month ago #7267 by Ben
Replied by Ben on topic Re:1996 Ford F 150 4.9 L6
What doesn't make sense is that pin 103 you do have ground but it grounds together with pin 76 ,77 ,51 and 24

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7 years 1 month ago #7268 by Ben
Replied by Ben on topic Re:1996 Ford F 150 4.9 L6
Clean your g101 ground strap and maybe add a jumper to the battery ground just to be sure you have a good ground if you're in the rust belt like I am it wouldn't surprise me if the body ground was bad as well

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7 years 1 month ago #7274 by ScannerDanner
Replied by ScannerDanner on topic Re:1996 Ford F 150 4.9 L6

toadyboy1957 wrote: I have no grounds to the 3 solenoids i was asking about earluer i have no grounds to the 3 heated o2 sensors no ground for this orange nlue fuel pump control wire i have ground to the PIP wire for the ignition and i have ground to the TPS IAC and the ground i have provided for the fuel pump relay to make iyt run all powers and grounds are good to all lighta and accessorues other than that


Can you tell us how you are testing your grounds? You mention circuits above that are switched grounds (IAC, Solenoids, O2 heaters (some), fuel pump relay control). You would not test these the same way as your main computer grounds. Thanks!
Don't be a parts changer!
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7 years 1 month ago #7294 by toadyboy1957
Replied by toadyboy1957 on topic Re:1996 Ford F 150 4.9 L6
thats the last thing im trying to be is not changing expensiive parts when all i need to do is ground things i will check and and verify all grounds as necessary

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7 years 1 month ago #7302 by toadyboy1957
Replied by toadyboy1957 on topic Re:1996 Ford F 150 4.9 L6
i test all grounds with a VOM or a 12 volt test light from from battery posotive

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7 years 1 month ago #7308 by ScannerDanner
Replied by ScannerDanner on topic Re:1996 Ford F 150 4.9 L6

toadyboy1957 wrote: i test all grounds with a VOM or a 12 volt test light from from battery posotive


As long as you are NOT using the ohmmeter. For this type of testing a voltage drop measurement is key, but I do like the test light too.
Don't be a parts changer!
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7 years 1 month ago #7309 by toadyboy1957
Replied by toadyboy1957 on topic 1996 Ford F 150 4.9 L6
i use VOM FOR CONTINUITY testing only

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7 years 1 month ago #7310 by ScannerDanner
Replied by ScannerDanner on topic 1996 Ford F 150 4.9 L6







If the truck is running fine with the fuel pump relay coil manually grounded, the chances of you having a bad main computer ground are very slim but you should check them anyway.
Don't be a parts changer!
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7 years 1 month ago - 7 years 1 month ago #7311 by ScannerDanner
Replied by ScannerDanner on topic 1996 Ford F 150 4.9 L6

toadyboy1957 wrote: i use VOM FOR CONTINUITY testing only


You need to stop using the ohmmeter for that. I can give you many examples as to why. Here is the best lesson
www.youtube.com/edit?o=U&video_id=44dP6X3QS5A
Don't be a parts changer!
Last edit: 7 years 1 month ago by ScannerDanner.

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7 years 1 month ago #7313 by toadyboy1957
Replied by toadyboy1957 on topic 1996 Ford F 150 4.9 L6
if im doing something wrong please let me know best way to test all and thanks again

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7 years 1 month ago #7314 by ScannerDanner
Replied by ScannerDanner on topic 1996 Ford F 150 4.9 L6

toadyboy1957 wrote: if im doing something wrong please let me know best way to test all and thanks again


You're fine man. Use your test light and check those grounds I provided for you.
I am concerned that the driver in the ECM for the fuel pump relay is bad. The question is why? What happened? When did this problem start?
A history would help us here for sure. In the mean time, check those main grounds.
Don't be a parts changer!

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