That would be never. All s-series have timing chains. (chain will stretch and get noisy if car oil not checked and changed on regular basis)
Timing chain usually needs to be replaced each 180-200K miles.
It should be replaced every 90,000 miles.
All Saturn 4 cylinder engines have an internal timing chain. All Saturn V6 engines have a timing belt.
it has a timing belt that should be replaced around the 90,000 km mileage
2002 L-series used a belt.
The 6 cylinder Saturns were equipped with the "Ecotec" engine, which used a timing belt. Timing belts fail over time, and Saturn recommends that the belt be replaced every 100,000 miles. The 4 cylinder Saturns all used timing chains. With recommended service and normal use, the timing chain should not fail. It is recommended that you replace the timing chain and sprockets whenever the engine is rebuilt, but otherwise, the timing chain is considered to be quite reliable.
The timing belt on a Dodge Neon should be replaced every 100,000 miles.
toyota recommends that timing belts be replaced at 60,000; however, 100,000 miles is fine. Replace at 100,000 miles as preventative maintenance. 4 cylinder 2002 Camry has a timing chain which does not have to be replaced.
Chain
The DOHC SL2 has a timing chain.
The 2002 Honda Passport has a timing belt. This belt must be replaced every 100,000 miles. You should also replaced the water pump at the same time. Warning: This is an interference engine.
The belt should be changed every 100,000 miles. Warning, this is an interference engine.