Tsarin sarrafawa na motar yana kunshe da masu sauyawa, fuses, main da masu haɗin kai, relays, zafin jiki, na'urorin shigarwa, da dai sauransu, wanda yake da rikitarwa. Akwai nau'ikan laifuffuka da yawa, kuma galibi ya zama dole a bincika da warware matsalar tare da taimakon ƙirar ƙira.
Kara karantawa