Inzwa yokushisa yenjini
Isignali yayo ingenye yemingcele ebalulekile ngesisekelo lapho iyunithi yokulawula injini ibala inani elisheshayo lesikhathi sokuthungela kanye nomthamo kaphethiloli ojovwe.
Ezimotweni zesimanje, izinga lokushisa lenjini likalwa ngenzwa yokumelana ne-NTC etholakala kuyo 
okokupholisa injini. Isifinyezo esithi NTC simelela I-Negative Temperature Coefficient, i.e. esimweni senzwa enjalo, ukumelana kwayo kunciphisa ngokushisa okwandayo.
Izinga lokushisa liyipharamitha yokulungisa yokubala isikhathi sokuthungela ngeyunithi yokulawula injini. Uma lungekho ulwazi mayelana nezinga lokushisa lenjini, kusetshenziswa inani elingena esikhundleni sokubala, ngokuvamile lingama-80 - 110 degrees Celsius. Kulokhu, i-engeli yokuthungela kusengaphambili iyancipha. Ngakho-ke, injini ivikelekile ekulayisheni ngokweqile, kodwa ukusebenza kwayo kuyancipha.
Umthamo womjovo oyisisekelo, onqunywa kuye ngesivinini nomthwalo wenjini, esigabeni sokuqala esibandayo, kanye nakwezinye izimo zokusebenza, kufanele ulungiswe ngokufanele. Ukwakhiwa kwengxube kulungiswa, kufaka phakathi, ngokusho kwesignali yenzwa yokushisa injini. Uma lingekho, kuthathwa inani lezinga lokushisa elingena esikhundleni ukuze kubalwe, njengasendabeni yokulawula ukuthungela. Kodwa-ke, lokhu kungabangela ukuqala okunzima (ngezinye izikhathi ngisho kungenakwenzeka) nokusebenza okungalingani kweyunithi yokushayela ngesikhathi sokufudumala. Lokhu kungenxa yokuthi izinga lokushisa lokushintsha ngokuvamile libhekisela enjinini evele ifudumele.
Uma lingekho inani elithatha indawo, noma kukhona isifunda esifushane kumjikelezo, khona-ke ingxube ayicetshiswa, ngoba isifunda esifushane, i.e. ukumelana kwesekethe ephansi, kuhambelana nenjini eshisayo (ukumelana nenzwa ye-NTC kuncipha ngokukhuphuka kwezinga lokushisa). Ngokulandelayo, isifunda esivulekile, i.e. ukumelana okuphakeme okungenamkhawulo, okufundwa yisilawuli njengesimo sokupholisa kwenjini ngokwedlulele, okubangela ukunothiswa okuphezulu okungenzeka komthamo kaphethiloli.
Inzwa yohlobo lwe-NTC isebenza kahle ngokulinganisa ukumelana kwayo, okungcono kakhulu ezindaweni ezimbalwa kusici sayo. Lokhu kudinga ukushisisa ngamabomu kwenzwa kumazinga okushisa athile.
