Bob thanks for the pic. if I unbolt the unit does oil drain from the axle or unit? if so how and what type of oil do I refill it with? sorry for the dumb questions

Hey BobLarge, WHERE IS YOUR FRONT DRIVETRAIN???!!!

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I think TOD sucks. In my experience, it often kicks in too late for traction in muddy conditons when in 4 Hi. I remember reading a thread somewhere about how you can disconnect it and just go to 4H/4L option. Does anyone know where that thread is?

I think this is the information you were looking for:

4-HI conversion for TOD equipped Isuzus

I used these steps to override the TOD on my trooper.

Yes some oil will come out.
And yes you can add some oil when you put it back together.
And its just differential oil.
Check you owner manual for the correct type.

And as for getting it back in there. You might want to put some oil in a plastic baggy and carefully place it back in there. Once you drive it, the baggy will disintegrate, and deposit the oil.

If you donÆt want to add oil just make sure that it is full of oil in the ômainö part of the diff. The oil has to seep past a bearing to get back to where the axel disconnect is but after a couple hours of driving it should get oil back to that area.

johnu

Did you get the problem fixed.

Here is something I dug out of the "2002" service manual.

"Failure condition- The 4L mode is displayed even in 2H or TOD."
"Indicator lamp status - all exept "check" indicator lite."
"Transfer lever position - 2H or TOD"
"4WD Auto switch - On or Off"

Possible failure caused by 4L switch shorted to ground or failed switch.

diesel bob thanks for that info I will check it out. this is a message I sent to bob large this weekend

Bob thanks for helping me out on my trooper. I had some time today to trobleshoot the sotf. Its very confusing what is going on. Both solenoids are getting vacum. The gray solenoid is sending vacum to the actuator holding it in 4wd. This I think is all good so far. The blue solenoid does not click on so it doesent send out any vacum out to pull the actuator back the other way to release it from 4wd. I then checked voltage at the plugs on the solenoids and I got 11.9 volts so there is voltage getting to the solenoid but not activating it. I took off the solenoids and tested them by hooking them directly to a battery they both switched fine I could here them click and could blow through them and feel them change to different orfices. the voltage directly of the battery was 12.5 volts. if I connected it back on its plug with 11.5 volts it would not click. this is the confusing part that this little difference of voltage does not activate it. by the way I could not get either soleniod to switch with the voltage comming from the plugs no matter what position the 4wd switch on the dash was in. but could switch them with the voltage from the battery. with your knowlege of the tod system do you have any ideas thank you joh