Heating combustion chamber, glow plug increases fuel ignitibility and makes fuel in the foggy state easily when engine is cold. Thus, glow plug makes engine starting easily and decreases exhaust gas produced just after turning engine on when engine is cold.

Glow plug control unit(GCU) controls operation of glow plug by PWM with ECTS signal, battery voltage and IG KEY ON signal.

Through glow lamp in cluster, ECM let drivers know if glow plug is ON.