00' won't go into 4x4 Low

[ks10308]

Hi all, I have a 200 Ford Expedition 4.6. I recently got a lot of stuff changed on the car, driveshaft, suspension bridges, new front end suspension, etc etc. But there does seem to be a bit of a problem. My car has 141K and I can tell the transmission will need to be replaced before 200K, but heres the problem. A couple years back, I started the car up and it went into 4Low, tried everything, neutral, park but no, stayed at Low, drove home (slowly of course) and left the car alone. I came back to it a couple days later and it was fine, but I dare wouldnt touch the Low switch. Ok so every once in a blue moon, 4 high would turn on by itself like at a stop sign or traffic light, I would switch it back to awd and and of problem. However, i tried switching to 4 low again and it wouldnt engage. I know 4 high and awd work fine. What can be the problem? any ideas? Thanks!

 

[bedrck46]

may be the brake position switch make sure you have the expy in neutral and your foot on the brake

 

[ks10308]

may be the brake position switch make sure you have the expy in neutral and your foot on the brake

SeeI did that and thats still not working

 

[bedrck46]

other possibilities would be Transfer case shift relay or selector switch

 

[ks10308]

How can i check the transfer case relay?

 

[bedrck46]

can you read and understand electrical prints if so I can send you a copy of the prints

 

[bedrck46]

problem
The Vehicle Does Not Shift Between 4WD HIGH and 4WD LOW Modes Properly

possible solutions
4WD mode switch/circuitry.
CJB Fuse 23 (10A) and 20 (5A).
OSS sensor.
BPP switch.
Transfer case shift relays.
Transfer case mechanism.
CJB.
GEM.
DTR sensor.

 

[ks10308]

can you read and understand electrical prints if so I can send you a copy of the prints

That would be good if you could send a copy of the electrical prints. Thank you

 

[bedrck46]

prints

 

[bedrck46]

your problem also could be a bad shift motor.
before you change the shift motor check out the elect. circuit