How do you engage and disengage 4 wheel drive on a isuzu trooper 3.0 year 2000

check that the hub locks are engaging and that the selector actuator is actually putting it in 4wd.

There is nothing wrong with the system. When the TOD is in auto it will only engage the front wheels when the rear wheels lose traction. Newer small SUVs have just the opposite, they are in front wheel drive until they lose traction and then engages the rear. Isuzu was ahead of its time with the TOD system.

If you need further help, reach me via phone at https://www.6ya.com/expert/scott_843b43f7ebebd3f5

There is a vacuum switch on the transfer case left side,up high!(Most have 2-3 vacuum hoses) That switch is bad!

While driving, apply the foot brake and press the 4x4 button. If it engages, it can be bad auto locking hubs, or a bad torque converter. This is the same problem I am having right now but I was able to the get the 4x4 to work by doing what I described above. I am going to take off the wheels and check the hubs and eventually work toward the torque converter. I'll keep you updated.

Check the automatic locking hub on the right side. BEWARE: You MUST have the appropriate special service tools for this job!!!!!

The vehicle will not engage in 4WD operation when the vehicle is off the ground, as the automatic locking front hubs require front wheel load to engage. When the hubs DO lock, it is normal to hear 2 to 3 soft clicks. Anything after that indicates a problem.

If memory serves, there is a cam bushing behind the plate that will wear out, and if the plate is worn out, the hub clicks and will not engage.

fords are famous for this. Its electronically controlled 4x4(push button) i would start cheap and replace that switch

Check the engine bay fuse box for relay X-18 clicking when you press the button .

Did the wires on the 4wd switch get crossed when the box was dropped back ?

sort of switch

not transfer case motor....there is none on a rodeo....trooper has torque on demand.....rodeo problem is likely shift on fly mtr...mounted on front axle....if u dont use 4wd regularly it sticks and gets stuck.