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Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 44489
Experience:  16 years experience
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97 Ford F-150 4x4 is stuck in 4 low. I have replaced both

Customer Question

97 Ford F-150 4x4 is stuck in 4 low. I have replaced both solenoids and the 4x4 selector switch to no avail. There is constant power to the solenoids but when I flip the switch the ground doesn't switch to active the 2wd solenoid.
JA: Are you fixing your F150 yourself? What have you tried so far?
Customer: I just told you what I've tried.
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 2 months ago.
Category: Ford
Expert:  Chris (aka- Moose) replied 2 months ago.

Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.

Have you done any diagnostics yet on the GEM module, and the shift motor?

Can you do diagnostics with a scan tool and or volt meter?

Customer: replied 2 months ago.
I can use a voltmeter but wasn't sure what to check in the GEM. If it was a problem with the shift motor wouldn't the solenoids still switch polarity? Meaning one open and the other close when you move the selector switch from 2wd to 4wd.
Expert:  Chris (aka- Moose) replied 2 months ago.

The solenoids which control the vacuum to the front axle are not going to activate until the transfer case shifts. They must get a command from the GEM module as the GEM module monitors the encoder built into the shift motor.

Can you do the test below.

https://dl.dropboxusercontent.com/u/90220402/shiftwire.pdf

https://dl.dropboxusercontent.com/u/90220402/shifttestB.pdf

This is my 1st answer, but does not have to be my only answer. You the website and myself expect you to have a ~~~5 STAR EXCELLENT~~~ experience with my help. Please let me know if you are pleased by selecting a star rating above or by replying and saying your pleased. Not rating or rating 1-2 stars does not benefit you nor me in any way. Follow up and reply as often and when needed, there is no extra charge to do so.

Thanks Moose.

Expert:  Chris (aka- Moose) replied 1 month ago.

Hello again Chris here,

  • I am following up with you to see if you got everything you needed from my answer.
  • I have not heard back from you, so I assume you were not pleased. We're you pleased with my help?
  • If you were not pleased with my help, please let me know by replying so I can help more.
  • This post is coming up on the 7 day mark where it times out. When a post times out, that means it's no longer on my active list (you reply and I may never know it.)

Thanks Chris

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