expedition 2005 4x4 problem

[tony0411]

Ok so my 4x4 doesnt work lights dont turn on, on 4h and 4l and doesnt engage , i already check the fuse and the transfer case shift motor , i think my problem is electrical but im not sure of what else i can look for

 

[tony0411]

And please no rude comments im just trying to find a solution and not looking for drama ,thanks

 

[Bedrck47]

Can you read and understand wiring diagrams

 

[Bedrck47]

The instrument cluster 4L and 4H indicators do not operate correctly/do not operate/flash
Instrument cluster.
Circuitry.
4x4 module (PCM).
Go To Pinpoint Test I .

The vehicle does not shift between 2WD and 4WD modes correctly
Mode select switch (MSS).
Transfer case.
Transfer case clutch.
Integrated wheel ends (IWEs).
4x4 module (PCM).
Circuitry.
Go To Pinpoint Test C .

The vehicle does not shift between 4H and 4L modes correctly
Transfer case.
Mode select switch.
4x4 module (PCM).
Transmission drag torque.
Go To Pinpoint Test D .

4WD does not engage at speed correctly
Transfer case clutch coil.
4x4 module (PCM).
Integrated wheel ends (IWEs).
Go To Pinpoint Test E .

 

[tony0411]

Can you read and understand wiring diagrams

Yes

 

[Bedrck47]

Even though you say you checked fuses look at the attached print and make sure you checked the fuses shown. Also you may want to check the selector switch for resistance values


C1 CHECK FOR DTCs
Connect the diagnostic tool.
Carry out the 4x4 module (PCM) on-demand self test.
Are DTCs retrieved?
Yes
If DTC P1812, GO to C5 . If DTC P1815, GO to C7 . DTC P1867 or P1891, GO to C15 . If DTC P1849, P1853, P1857, or P1861, GO to C17 . If DTC P1820 or P1828, GO to C26 . If DTC P1822 or P1830, GO to C28 .

No
GO to C2 .
C2 CHECK THE IGNITION SWITCH STATUS PID
Key in ON position.
Monitor the ignition switch status PID.
Do the ignition switch PIDs match the ignition switch positions?
Yes
GO to C3 .

No
CHECK the ignition switch. REFER to Section 413-00 . After the fault is repaired, CLEAR the DTC. REPEAT the self test.
C3 CHECK THE MODE SELECT SWITCH (MSS) POSITION PIDS
Key in OFF position.
Connect the diagnostic tool.
Key in ON position.
Monitor each MSS PID while cycling through each MSS position.
Does each MSS PID agree with each switch position?
Yes
GO to C8 .

No
GO to C4 .
C4 CHECK THE MSS
Key in OFF position.
Disconnect: MSS C284.
Measure the resistance between MSS C284, terminals 2 and 3, while rotating the switch through all positions. Refer to the following chart.

Mode Select Switch (MSS) Position Resistance
4L 62 ohms
4H 130 ohms
2H 620 ohms
A4WD 270 ohms



Are the resistance values within specification?
Yes
GO to C5 .

No
INSTALL a new MSS. CLEAR the DTC(s). REPEAT the self test.

 

[bnicov]

Did you tap the motor on the transfer case lightly with a hammer (looks like a windshield wiper motor)?? Before anything, try that first. 4wd systems need to be exercised weekly to be reliable. Go through the modes once a week or so and drive a few feet. Hopefully it's simple. Good luck!!

 

[Bedrck47]

Did you tap the motor on the transfer case lightly with a hammer (looks like a windshield wiper motor)?? Before anything, try that first. 4wd systems need to be exercised weekly to be reliable. Go through the modes once a week or so and drive a few feet. Hopefully it's simple. Good luck!!

In another post you wrote
"Tap the starter and the solenoid with a hammer. If that gets it going, you are looking at a new starter or solenoid. Its simple and works sometimes. But, do not wait. It will not work forever."


Is that the only tool you have in your tool box??













|

 

[stamp11127]

Hey bedrck47, that is the southern way of "fixin thangs" down here.
You start with a small hammer and progress up to a sledge hammer. After that you will replace the part 'cause it's in pieces.

Every tool box has duck tape, bailing wire, wire nuts, some fishin lures....and don't forget the Alabama speed wrench - SAE on one side and Metric on the other.

 

[bnicov]

Actually, i have a wide selection of hammers...... for these two problems, thats how I would start. If I can avoid breaking out wiring diagrams and voltmeters etc... with the tap of a hammer. Why not?? Start with simple things then go from there.

 

[Bedrck47]

Actually, i have a wide selection of hammers...... for these two problems, thats how I would start. If I can avoid breaking out wiring diagrams and voltmeters etc... with the tap of a hammer. Why not?? Start with simple things then go from there.

So if you hit it with a hammer and it works then do you give up or do you take the time to troubleshoot it the correct way.

 

[Skauber]

It's an old school trick on electrical motors with brushes like the starter, fuel pump and transfer case shift motor. If you tap it with a hammer and it suddenly start working, you almost certainly have just identified the problem, worn brushes in the motor and you have to replace it. (Or fix the brushes if you so desire, but nobody does that anymore.. )

 

[Bedrck47]

It's an old school trick on electrical motors with brushes like the starter, fuel pump and transfer case shift motor. If you tap it with a hammer and it suddenly start working, you almost certainly have just identified the problem, worn brushes in the motor and you have to replace it. (Or fix the brushes if you so desire, but nobody does that anymore.. )

I am very familiar with Old School tricks My point was that you don't need the hammer to identify a problem that you know already is present. And in most cases hitting it with a hammer is like putting on a Band-Aid. All that it amounts to is a possible temporary fix if it indeed does get the part running again.

 

[Skauber]

The way I see it, it can be a temporary fix that also diagnoses the problem. You can then order the part and still use the failing, but now temporary working part while waiting for the new part to arrive and then replace it. Not a bad way to go in my opinion. Tapping it with a hammer will not fix it of course.

 

[Bedrck47]

yep murphy's law hit it with a hammer hope it stays running while waiting for parts then you get stranded 50 miles or more from home and the hammer doesn't get it running again

 

[bnicov]

If you hit a component with a hammer then it works. Lo and behold, you have identified the problem part. With the 4x4 motor, you know it is on its way out butyou can live without it, with a bad starter or solenoid, it will leave you on the road one day. What is there to diagnose if you have identified the problem part?? There is no need for snarky comments. Besides, a hammer makes for a good weapon for the zombie apocalypse. Cheers!!

 

[Bedrck47]

If you hit a component with a hammer then it works. Lo and behold, you have identified the problem part.

So what happens if you hit it with the hammer and nothing happens Does that mean it isn't the problem???

 

[bnicov]

I guess so, then you get the wiring diagram out and a circuit tester and go to work. Rule out the easy stuff first. These trucks are known to have issues with the transer case motor. Thats the most common problem. Ruling it out takes all of 30 seconds, including the time spent choosing which hammer to use. Going through the wiring diagram can take hours.

 

[Skauber]

If tapping does nothing, then the easy part of the diagnostic work is done. It does not rule out the motor as motors can fail in different ways, and not all ways are susceptible to a hammer tap. You go on with the diagnosis as you would normally. Tapping on an old starter or any brushed motor can potentially save you hours of head scratching and identify the problem within a minute, I don't understand why that is a bad thing...


Edit: And of course, you don't venture out on a holiday knowing your starter is bad. But as long as you can get it to start with a tap of a hammer (transfer case motor isn't that crucial, just leave it in 2H or AWD until you get the part and you never will get stranded) then you're good to go. It won't last forever, but when I was a student and had no money, I kept a hammer handy in my old beater and I was always able to get it going with a couple of taps. Sucks in winter, but what do you do when your choice is to either have a car or not since you can't afford a new starter?