4x4 won't always work!?

[Triathlete]

Elsewhere on this forum, the TOD was described as being an electrical clutch system utilizing Pulse Width Modulation (PWM) to activate the clutch. All that means is that the vehicle sends longer or shorter pulses to the clutch to adjust the amount of power sent to the wheels.

Your problem could be anything from speed sensors at the wheels, to electrical connection between the computer & the TOD to mechanical problems in the transfer case. That's why we need more detail on what your symptoms are.

Or, it may be working the way it is designed to work!

[mbeach]

I authored one of the longer, more boring TOD meets PWM write-ups.

The biggest indicator of any type of TOD problem is the flashing red "TOD" indicator.
If it ain't working like it should, that light will tell you long before you sense something is amiss.

It's a pretty good system in that respect.

[tom4bren]

"Or, it may be working the way it is designed to work!"

True, I thought of that but forgot to put it in my response.

[uncle_asa]

I had hub snap ring self-detached from the drive shaft, so sometimes 4x4 wont worked as expected. If it the case - check knuckle needle bearing, most likely it is dead as well.