How do you engage 4x4 in 1989 bronco
Posted 29 October 2011 - 05:19 PM
MANUAL LOCKING HUBS
5.0 Liter V8
Posted 30 October 2011 - 05:56 AM
If the locking hubs are the automatic type, they engage by themselves; if manual hubs, each hub on both front wheels need to to be turned to Locked before pressing any buttons on dash.
Manual Hubs & 1356 Electric Shift Operational Test; "... (engine off, hubs disengaged), crawl under the truck with the transfer case in 2HI, you should be able to grab the front drive shaft and turn it by hand. Also with the hubs disengaged you should see the front axles turning freely. Now engage the hubs and you should not be able to turn the drive shaft by hand. Jack the front wheels off the ground with the hubs engaged, turn the drive shaft by hand, the wheels should turn. The 4x4 light should not be on in 2HI, when in 4LOW you may have a low range light on, (not all trucks have that light) at least mine doesn't..."
Source: by Seabronc (Rosie, Fred W) at Ford Bronco Zone Forums
Auto Hub Operational Test; Remember to block the wheels. This would work for testing manual hubs too, just lock them 1st; "...Place transfercase in 2HI or Neutrall. 2. Lying under vehicle, turn front drive shaft (one direction only). 3. Automatic hubs should lock after 1 to 5 turns of driveshaft (one direction only). After step 3 the hubs should lock, youll know they are locked becouse you will hear a click from both hubs and you will no longer be able to turn the front drive shaft (in the same direction). If this is not the case then continue to step 4. If you can no longer turn the drive shaft (in the same direction) then skip to step 7. 4. If you can still turn the drive shaft (one direction only) then one or more of your Auto hubs is not working. 5. Continuing to turn the Drive shaft (one direction only). 6. Look at the u-joints for the front stub axles, if both are turning then both front hubs are malfunctioning, if only one is turning then the one that is not turning is locked and the one turning is malfuctioning. Replace as necosary (preferably with manual hubs, Auto hubs have Yams in them) 7. To unlock the hubs, turn drive shaft in opisat direction untill you hear a click from the hubs. To check for transfercase engagement. 1. Place pushbutton transfercase in either 4 HI or 4LO. 2. lie under vehicle. 3. You should not be able to turn front drive-shaft in either direction. 4. If you can turn the front drive shaft then your transfer case is not shifting properly..."
Source: by Gacknar
Take time to read through this;
Four Wheel Drive (4X4) General Information, Operation & Troubleshooting TSB 92-1-8 for Bronco, F Series & Ranger (COMPLETE); Includes Electric Shift On The Fly (ESOF) Troubleshooting & Hub Operation; same for 87-96; exc for that in 87; power from Fuse 6 (15 amp) to "ELECT SHIFT CONTROL MOD" WHT-PPL and CB 12 (30amp) to "ELECT SHIFT CONTROL MOD" BLK-WHT; SEE A7 and A8 in the 4x4 diagram, it shows those two wires BLK-WHT as BK/W from SHIFT MODULE to P1 BATTY and and WHT-PPL as W/P to P2 Source: by Ford via Chilton
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Posted 30 October 2011 - 10:49 AM
MANUAL LOCKING HUBS
5.0 Liter V8
Posted 30 October 2011 - 06:33 PM
With the hubs unlocked, 1. try turning the front drive shaft by hand, It should turn freely. 2. With the key in RUN, press the 4x4 button, you should not be able to turn the shaft. If you have someone who can press the button while you listen for the shift motor to operate, that may work better. Just be sure the emergency brake is on and the wheels are chocked for safety purposes.
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Posted 31 October 2011 - 02:53 AM
For the shiftmotor and other possible causes go though that Four Wheel Drive (4X4) General Information, Operation & Troubleshooting TSB 92-1-8 for Bronco, F Series & Ranger (COMPLETE); Includes Electric Shift On The Fly (ESOF) Troubleshooting & Hub Operation; same for 87-96; exc for that in 87; power from Fuse 6 (15 amp) to "ELECT SHIFT CONTROL MOD" WHT-PPL and CB 12 (30amp) to "ELECT SHIFT CONTROL MOD" BLK-WHT; SEE A7 and A8 in the 4x4 diagram, it shows those two wires BLK-WHT as BK/W from SHIFT MODULE to P1 BATTY and and WHT-PPL as W/P to P2 Source: by Ford via Chilton
An issue is the shift motor's travel stops; some give the motor a whack w/a mallet.
see PAGE 8
TOUCH DRIVE" - NEW ELECTRONIC CONTROL MODULE FOR 1991
A new electronic control module has been installed on the 1991 model Ford trucks with "Touch Drive," built after 8/6/90. The new module features a different computer logic to control shifting.
With the previous module (YOUR 1989), it was possible for the driver to select 4L directly from 2WD. However, the control module actually shifted the vehicle into 4H first, then checked to see if the vehicle was stopped and that the automatic transmission was in neutral (or the manual transmission clutch was disengaged). If these conditions were not met, the actual shift wouldn't take place. Instead, everything would be made ready for the moment when the shift could be completed. This was called pre-staging.
During pre-staging, the Low Range light flashed. This confused some customers. In addition, pre-staging and the flashing light sent confusing signals to the new E4OD transmission's electronic controller.
The opearation is to Lock both hubs first; then shift into 4H
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