Step-1 (Instant Heating Mode): The preheating is controlled based on the coolant temperature while in IG ON Mode for improved engine start.

☞ In case the battery voltage exceeds 11.5V → Duty Control; below 11.5V → 100% Duty

Step-2 (Warm-up Mode): Controls the duty to maintain the glow plug temperature at 1,000℃ during engine start.

Step-3 (Post Glow): Controls the duty to keep the temperature below 1,350℃ with consideration to cool the plug temperature after the engine start.