Symptoms
The transfer case goes into 4WD but the front wheels don't drive. The actuator may have water inside.
The fix, step by step
- On part-time trucks an electric actuator on the front differential slides a collar to connect the passenger-side axle when you shift into 4WD.
- IH8MUD member BMThiker says most failures come from internal contacts that only rest on their terminals; he opened the housing and soldered the motor and switch contacts.
- Water can also get in through a failed seal, a cracked housing or a damaged breather tube.
- On the trail, remove the actuator (a few 12 mm bolts), move the shift fork and slide the collar over by hand, then refit it to get 4WD back.
Tools & part numbers
- 12 mm socket
- soldering iron and solder
- dielectric grease
- tools to drop the skid plate if fitted.
Where to buy the parts
4WD actuatorRockAuto ↗Amazon ↗
Differential breather hose fitting (DIFF03136)CruiserTeq ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Toyota FJ Cruiser parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.