4 by 4 not working
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4 by 4 not working
So, first off thanks for being there to help.
I have a 2005 f250 6.0. A couple weeks ago my 4 wheel drive just quit working. I have read other threads and I don't know what to do now. We tested the dash switch and it seemed like it didn't do anything so we got a new one. We have tested the relays and they are both ok. We we shorted across the relay we could hear the 4 by 4 shift motor turning so we know it has power, but it did not go into 4 wheel drive. No matter what we did with the dash switch the power under the relays never changed so it seems to me that it's before the relays. Any help?
Thanks in advance
Matt
I have a 2005 f250 6.0. A couple weeks ago my 4 wheel drive just quit working. I have read other threads and I don't know what to do now. We tested the dash switch and it seemed like it didn't do anything so we got a new one. We have tested the relays and they are both ok. We we shorted across the relay we could hear the 4 by 4 shift motor turning so we know it has power, but it did not go into 4 wheel drive. No matter what we did with the dash switch the power under the relays never changed so it seems to me that it's before the relays. Any help?
Thanks in advance
Matt
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Joined: Jun 2006
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It sounds like the hubs are not engaging. There is the ESOF valve on the passenger side above the front fender well. This puts vacuum to the front hubs to engage them. Locate the valve and remove the vacuum line going down to the hubs. Start the motor and shift into 4wd. You should be able to put you finger on the valve nipple and feel vacuum. If you feel vacuum, then your hub seals are leaking and not engaging. That will require you to pull the hubs apart and replace the seals. Kits are available to fix them.
Ed
Ed
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From: Spanaway
There is really only the one for the ESOF system. If you look on the door side of the passenger air bag you will find it.
It is a long slim package that tucks in that location. The harness plug sticks out towards the passenger side of the dash.
The one PDF called "308-07A Four Wheel Drive (4WD) Systems Diagnosis and Testing" will give you all the testing steps.
There is a lot that you can do with just a meter and a code reader. The code reader needs to be one of the better units.
Most all the readers that the parts stores use to give you the "free code reading" don't read much more than engine codes.
If I were you I would get the OBD2 reader and use Forscan with it. They have a version that will work with your smart phone
or is you want to go deeper get the one that has a use connector and use a laptop with the more advanced version. It costs
a few dollars but is not that bad and you can get a trial version that is free for I think two months. The reader will be in the $30
range depending on what one you want to get.
It is a long slim package that tucks in that location. The harness plug sticks out towards the passenger side of the dash.
The one PDF called "308-07A Four Wheel Drive (4WD) Systems Diagnosis and Testing" will give you all the testing steps.
There is a lot that you can do with just a meter and a code reader. The code reader needs to be one of the better units.
Most all the readers that the parts stores use to give you the "free code reading" don't read much more than engine codes.
If I were you I would get the OBD2 reader and use Forscan with it. They have a version that will work with your smart phone
or is you want to go deeper get the one that has a use connector and use a laptop with the more advanced version. It costs
a few dollars but is not that bad and you can get a trial version that is free for I think two months. The reader will be in the $30
range depending on what one you want to get.
Fleet Owner
Joined: Apr 2012
Posts: 27,307
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From: Spanaway
Tuners are some of the worst offenders when it comes to reading codes. If you have
a smart phone you can get the OBD2 dongle and use Forscan. If you want to go deeper
and have more options then you get a laptop and use the 2 month free trial. Really it not
that much for the license. On the Forscan web site they list the OBD2 devices that work best
with Forscan.
Anyway you likely have stored codes and just can't read them with what you have.
a smart phone you can get the OBD2 dongle and use Forscan. If you want to go deeper
and have more options then you get a laptop and use the 2 month free trial. Really it not
that much for the license. On the Forscan web site they list the OBD2 devices that work best
with Forscan.
Anyway you likely have stored codes and just can't read them with what you have.
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It turns out it was the transfer case shift motor. We tested everything using the details I was sent, thank you so much! We changed the switch on the dash and that didn't help. We tested all the circuits and all the wires. (By the way we do have vacuum hubs I was incorrect)