2002 shift on fly 4x4 problems.
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4th Gear
Joined: May 2012
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2002 shift on fly 4x4 problems.
I have a 2002 F150 with the Shift on the Fly system and my 4 High light stays on but the case will not go into 4x4. Here is what I know so far.
Tim
- I pulled the electric motor from the back of the case and the indicator is pointing to 2H. I can easily move the transfer case through 4H and 4L by hand. I do not think the case is in 4H nor will the motor activate to send it there.
- I do not see any voltage spike across the orange and yellow wire of the transfer case motor when I have someone flip the switch.
- I do not feel any "click" from the solenoids when the switch is thrown.
- the connecting rod on the axle vacuum is pulled in
- I cannot find the electric switch/sensor on the T-case that is on the manual cases. I do have either a vacuum line or a vent tube coming from the front driver's side of the case. I would guess this is different due to the manual vs shift on the fly cases.
- I have not found any blown fuses.
Tim
Lead Driver
Joined: Sep 2006
Posts: 7,907
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Not an ECM but a GEM module.
The GEM lights the light.
If you have no action when the dash switch is operated, my bet is on the GEM, at this point.
It's located behind the dash fuse block.
It is a programmed unit so needs to be the same and have the same program in it for replacment.
Check for a windshield leak while you in the area, dropping water in the module.
Good luck.
The GEM lights the light.
If you have no action when the dash switch is operated, my bet is on the GEM, at this point.
It's located behind the dash fuse block.
It is a programmed unit so needs to be the same and have the same program in it for replacment.
Check for a windshield leak while you in the area, dropping water in the module.
Good luck.
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87thhunter
1987 - 1996 F150 & Larger F-Series Trucks
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Jul 14, 2014 04:21 PM
