Just discovered my father-in-law's '05 Vibe Base hit 96K mi. Being a Honda person most of my life I told him we should replace the timing belt. I'm used to putting a timing belt kit into a Honda at 90k (all belts, tensioners, and water pump). Did this on my Wife's '01 Sienna which is the only Toyota I've owned, and thought it'd be the same with the Vibe. I fired up AllDataDIY to find out much to my surprise that 1ZZ's have a timing chain. I looked in my electronic copy of the owner's manual and I can't find a maintenance interval for the timing chain.
So, my question is, when does one change the timing chain?