i was driving off paved roads, and its been raining here a lot lately, so i had it in 4wd. now it won't disengage. i have the electronic shift on the fly ****, and when i turn it, the typical clicking and clacking doesn't happen. it won't go to 2wd hi or 4 lo. i really don't need 4x4 for the next month so my question is- is there any way to disengage it manuallly, or am i looking at a trip to the dealer?

 

Not sure about how to disconnect it but you should locate all the vacuum lines that control it and check them. Not sure what model or year you have but on my 97 they vacuum lines are located on the passenger firewall two funny looking valve type things and then run down past the battery tray then down the fender are and are connected witha vacuum manifold then down to the diff houseing or soleniod you may also want to disconncet the power to the solenoid that may disengaege the solenoid and allow it to come out of 4whdrive and back into 2 whdrive. Also is it in 4hi or 4lo you do realize you need to put the truck in Neutral and have your foot on the brake to make it disengage from 4lo right?


Richard D.

WHILE YOUR HERE CHECK OUT MY GALLERY:
https://www.f150online.com/galleries....cfm?gnum=2479

 

Try putting it in neutral, and turning it to 2hi. Then put it in reverse and drive back about 15 ft just to see if that disengages it. Not sure if it will work, but it's worth a try.

 

You may also be able to remove the vacuum motor located on the diff. which may be your problem anyway and manually disengage the lever that actuates the diffarential.

Richard D.

WHILE YOUR HERE CHECK OUT MY GALLERY:
https://www.f150online.com/galleries....cfm?gnum=2479

 

sorry. 1999 F150 5.4 Off Road Package... its in 4 hi. i'll probably crawl under there sometime today and see what i can see. it won't go into 2hi or 4lo, so i thought i was probably an actuator of some sort. would disconnecting the power to the battery disengage the solenoid?
i appreciate the help. thanks

 

Well then since it is in 4Hi there is no need to stop and put the truck into neutral try the other steps I suggested. It does sound like a vacuum line possibly or the vacuum motor itself. Let us know what you find.

Richard D.

WHILE YOUR HERE CHECK OUT MY GALLERY:
https://www.f150online.com/galleries....cfm?gnum=2479

 

Mine did the same thing yesterday! I disconnected the battery and waited a few minutes then plugged it back up and it disengauged. I still don't kow what caused it.

 

These are the possibilities...



Possible Source(s):
§ 4 WD mode switch.
§ Transfer case shift relays.
§ Contact plate A, B, C, or D.
§ Transfer case shift motor.
§ Circuitry.
§ Transfer case mechanism.

doesn't help much....

here's the pinpoint test.... it's all way over my head.... I'd try the Bill Gates method first (Re-set the computer).

Transfer Case — ESOF

PINPOINT TEST A: THE VEHICLE DOES NOT SHIFT BETWEEN 2WD AND 4WD MODES CORRECTLY
² A1: CHECK THE VOLTAGE OUTPUT FROM CJB FUSE 23 (10A)
² A2: CHECK CJB FUSE 23 (10A) AND BJB FUSE 104 (30A)
² A3: CHECK CIRCUIT 1052 (T/BK) FOR VOLTAGE
² A4: CHECK THE IGNITION STATES
² A5: RETRIEVE THE RECORDED GEM DTCS FROM BOTH CONTINUOUS AND ON-DEMAND SELF-TESTS
² A6: CHECK THE HIGH LAMP INDICATOR — TRIGGER THE GEM ACTIVE COMMAND HIGH LAMP ON
² A7: CHECK THE 4WD MODE SWITCH — MONITOR THE GEM PID 4WDSGEM.
² A8: CHECK THE 4WD MODE SWITCH — MONITOR THE GEM PID 4WDSGEM (4H)
² A9: CHECK THE 4WD MODE SWITCH — MONITOR THE GEM PID 4WDSGEM (4L)
² A10: CHECK THE 4WD MODE SWITCH — 2H
² A11: CHECK THE 4WD MODE SWITCH — 4H
² A12: CHECK THE 4WD MODE SWITCH — 4L
² A13: CHECK CIRCUIT 780 (DB) FOR OPEN
² A14: CHECK CIRCUIT 780 (DB) FOR SHORT TO GROUND
² A15: CHECK CIRCUIT 780 (DB) FOR SHORT TO POWER
² A16: CHECK CIRCUIT 682 (DB) FOR OPEN
² A17: CHECK CIRCUIT 682 (DB) FOR SHORT TO GROUND
² A18: CHECK CIRCUIT 682 (DB) FOR SHORT TO POWER
² A19: CHECK THE FRONT AXLE ENGAGEMENT
² A20: CHECK THE FRONT DRIVESHAFT ENGAGEMENT
² A21: CHECK THE FRONT DRIVESHAFT DISENGAGEMENT
² A22: CHECK THE FRONT AXLE DISENGAGEMENT
² A23: CHECK THE TRANSFER CASE SHIFT RELAYS COIL ACTIVATION — MONITOR THE GEM PIDS MTR_CCW AND MTR_CW
² A24: CHECK THE TRANSFER CASE SHIFT RELAYS COIL DE-ACTIVATION — MONITOR THE GEM PIDS MTR_CCW AND MTR_CW
² A25: CHECK THE VOLTAGE TO THE TRANSFER CASE SHIFT RELAYS COILS — CIRCUIT 704 (DG/LG)
² A26: CHECK CIRCUIT 781 (O/LB) FOR OPEN
² A27: CHECK CIRCUIT 782 (BR/W) FOR OPEN
² A28: CHECK CIRCUITS 781 (O/LB) AND 782 (BR/W) FOR SHORT(S) TO GROUND
² A29: CHECK CIRCUIT 782 (BR/W) FOR SHORT TO POWER
² A30: CHECK CIRCUIT 781 (O/LB) FOR SHORT TO POWER
² A31: CHECK THE TRANSFER CASE SHIFT RELAYS COILS
² A32: CHECK THE VOLTAGE TO THE ELECTRIC SHIFT MOTOR — MOTOR ON
² A33: CHECK THE VOLTAGE TO THE TRANSFER CASE SHIFT RELAYS SWITCH — CIRCUIT 704 (DG/LG)
² A34: CHECK THE VOLTAGE TO THE ELECTRIC SHIFT MOTOR — MOTOR OFF
² A35: CHECK CIRCUITS 777 (Y) AND 778 (O) FOR SHORT(S) TO POWER
² A36: CHECK CIRCUITS 777 (Y) AND 778 (O)
² A37: CHECK CIRCUIT 777 (Y) FOR OPEN
² A38: CHECK CIRCUIT 778 (O) FOR OPEN
² A39: CHECK THE GROUND TO THE TRANSFER CASE SHIFT RELAYS — CIRCUIT 57 (BK)
² A40: CHECK THE CONTACT PLATE SWITCHES
² A41: MONITOR THE GEM PID PLATE_A FOR OPEN
² A42: CHECK THE CIRCUIT 771 (P/Y) TO THE CONTACT PLATE SWITCH A — MONITOR THE GEM PID PLATE_A
² A43: CHECK CIRCUIT 771 (P/Y) FOR SHORT TO GROUND
² A44: CHECK CIRCUIT 771 (P/Y) FOR OPEN
² A45: CHECK CIRCUIT 771 (P/Y) FOR SHORT TO POWER
² A46: CHECK CIRCUIT 762 (Y/W) FOR SHORT TO POWER
² A47: CHECK CIRCUIT 762 (Y/W) FOR OPEN
² A48: MONITOR THE GEM PID PLATE_B FOR OPEN
² A49: CHECK THE CIRCUIT 770 (W) TO THE CONTACT PLATE SWITCH B — MONITOR THE GEM PID PLATE_B
² A50: CHECK CIRCUIT 770 (W) FOR SHORT TO GROUND
² A51: CHECK CIRCUIT 770 (W) FOR OPEN
² A52: CHECK CIRCUIT 770 (W) FOR SHORT TO POWER
² A53: MONITOR THE GEM PID PLATE_C FOR OPEN
² A54: CHECK THE CIRCUIT 764 (BR/W) TO THE CONTACT PLATE SWITCH C — MONITOR THE GEM PID PLATE_C
² ***: CHECK CIRCUIT 764 (BR/W) FOR SHORT TO GROUND
² A56: CHECK CIRCUIT 764 (BR/W) FOR OPEN
² A57: CHECK CIRCUIT 764 (BR/W) FOR SHORT TO POWER
² A58: MONITOR THE GEM PID PLATE_D FOR OPEN
² A59: CHECK CIRCUIT 763 (O/W) TO THE CONTACT PLATE SWITCH D — MONITOR THE GEM PID PLATE_D
² A60: CHECK CIRCUIT 763 (O/W) FOR SHORT TO GROUND
² A61: CHECK CIRCUIT 763 (O/W) FOR OPEN
² A62: CHECK CIRCUIT 763 (O/W) FOR SHORT TO POWER