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Operating Conditions
• Engine is running
• Engine RPM is within a specified range. (EGR OFF under high RPM range)
• Engine torque is within a specified range. (EGR OFF under high torque range)
• Vehicle speed is within a specified range. (EGR OFF under high speed range)
• Atmospheric pressure is within a specified range. (EGR OFF under high altitude and low atmospheric pressure)
• Coolant temperature is within a specified range. (EGR OFF under high or low temperature)
• EGR OFF under extended period of idling.
Control Logic
• Main map: EGR volume is controlled based on intake air volume
• Auxiliary map
- Coolant temperature (Coolant temperature sensor)
- Engine rpm (Crankshaft position sensor)
- Engine load (TPS): Detection of sharp acceleration
- Intake air temperature (HFM): Decreases when over 60°C
- Atmospheric pressure (Barometric sensor): Compensation of altitude
• Compensation value of auxiliary map will be increased/decreased based on main map then ECU calculates EGR
volume finally to regulate the vacuum duty that applies to the vacuum modulator to control EGR valve openings.
Shut-off Conditions
• Engine rpm: over 2,950 rpm
• Vehicle speed: over 105 km/h
• Coolant temperature: over 100°C or below 10°C
• Idle period: over 50 seconds
EXHAUST SYSTEM
DI ENG SM - 2004.4
DI04-33
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
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