LOS ANGELES – Toyota said Tuesday it has extensively reviewed operations of suppliers disrupted by Japan’s record earthquake and has a “clear idea” when certain parts will be available.

The carmaker, which last week estimated it would need until at least November to return production to pre-quake volumes, said that supplies of microchips, rubber materials and paint additives are the main bottlenecks.

Atsushi Niimi, executive vice president for global production and engineering, declined to say in a conference call how many days of parts inventory Toyota has on hand or to discuss which new-model releases may be delayed.

Toyota declined to discuss the quake’s impact on earnings before it announces financial results May 11.

On April 22, Toyota estimated it may lose production of 300,000 autos in Japan and 100,000 at plants abroad through the end of April because of quake-related shutdowns.