tod check light

[ron]

for the past few weeks, my red CHECK light starts flashing just after a few minutes of driving.
It pretty much stays on the whole time while driving, short or long trips.
Trans has been having trouble shifting from 2 to 3rd gear sometimes, but its been doing that
for almost 2 yrs. It could be in my head, but I feel like Ive been hearing diff noise in the
rear diff when making a sharp slow turn in a parking lot.
My green lites still seems to show grip under hard acceleration, from bottom to top.
The Az weathers been mid 80s, nothing out of the blue there.
How do you pull codes for diagnostics on that part of the system, or can you ?
truck has about 178k on it...

You can do a self diagnois and pull codes yourself from TOD. All you need is some speaker wire and find out location of the #8 pin on the obd plug and ground it. It's basically an easy counting process of the TOD 'check' light itself. There's also another process which you can erase the TOD codes putting the manual 4wd shifter into neutral and step on the brake 5 times within 5 seconds. I suggest checking out the youtube link for the abs codes down below to understand the counting process. Check out this link which will give you a better step by step process:

http://www.justanswer.com/car/2ws0a-...eck-light.html

The same process can be used for the abs light if you want to pull the codes. But instead of grounding the #8, you plug it into #12. Here's a video to how to do that:

https://www.youtube.com/watch?v=3JenyKOVJEI

Good luck.