You don't because its a chain!!
The timing "chain"will start rattling at around the 100k to 110k mark. This is when it should be replaced
The 2003 Chevy Malibu does not have a timing belt. It has a chain which should last the life of the engine.
7th Generation Celicas (2000 and newer) have a chain, not a timing belt.
They have a timing chain, which you probably will never have to be replaced.
100,000 miles
At 90Kmiles
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I cant be sure, so you should consult a service manual for your car, but I don't believe that the timing chain would need to be replaced in a car that new. If it was making noises, then maybe. A timing chain shouldn't go out before 150k. If it actually has a timing belt then once again check your manual, but i believe its in the 90-100k range.