Replaced the Actuator but still the same problem. Tried 4L it seams to engage but light keeps flashing.
I am sure you already know this but will mention it anyway just for others that read your question. On all of my trucks you can not shift in or out of 4wd low unless transmission (not transfer case) is in neutral and vehicle pretty much stopped. The transfer case for 4wd low is geared so different that system will not change back out of low (or fully into low) unless trans control is telling computer that it is in neutral.
Testimonial: "Thank you for the good advice but that does not fix the problem. I think I need a trouble shooting plan to isolate the malfunction."
SOURCE: '2002 yukon service 4x4 light on
Most of the time this problem is caused by the 4 wheel drive switch. Usually you can just replace the switch and that will fix the problem. I have replaced many of those switches and that has fixed the problem.
SOURCE: 2002 4Runner - 4 wheel drive indicator won't go off
When the transfer case is not engaged for extended periods of time, the motor inside for the 4WD sticks. Try this: Raise the vehicle on a hoist, and do some tapping on the case while switching the 4WD indicator. Sometimes, this will free up the contacts inside the 4WD shift motor.
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SOURCE: My 4 wheel drive push buttons flash in 4h and 4l and auto 4wd.
common problem with these is corrosion at electrical connector in control box located on passenger side behind kick panel
Take it to the Jeep dealer . It's still under warranty. Won't cost you a penny. Good luck.
SOURCE: 4L light flashes in 05 rodeo 4x4 3.0 deisel
water is getting inside the switch boot on the transmission
when it dries , light goes out
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When the actuator pump is not working (by not applying pressure) the other front wheel should remain stationary while the wheel turned by hand is turning.
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Install the actuator pressure gauge to the actuator pump assembly (1) .
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Install a voltmeter and the battery to the pump assembly (1) .
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Tighten the adjusting knob as far as it will stop and the air check side opening by a hose as a blind plug.
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Check that the actuator assembly motor starts to run (a running sound can be heard) when the battery is connected and when it stops when specified pressure is obtained. Specified pressure is: 38.0- 58.0 kPa (5.40 -- 8.25 psi).
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Ensure that the voltmeter is within specifications when the motor is running should be about 0v and when the motor has stopped it should be about 10 -- 14v
good luck !
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