I'll bet the timing belt did jump a cog or two. At the crankshaft line up the mark on the timing belt gear straight up so it lines up with the mark on the block.

Then check the cams. The "I" on the intake cam should line straight up with the mark on the head. Same with the "E" on the exhaust cam. If they don't line up the belt jumped.

The DOHC engine is non-interference so you should be able to replace the belt with no internal damage to the engine.

Once the timing belt is properly installed you don't have to worry about additional engine timing. In fact there are no timing adjustments. The ECM takes care of proper timing as long as the timing belt is properly installed. If you want the procedure for changing the timing belt e-mail me at mjats@juno.com