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Transcript
Carman scanFor EMS PROfesor
1.12.3 EGR Valve Operation Trouble type and Analysis
Malfunction of EGR valve
Trouble
1. Malfunction of valve operation
2. EGR valve closed stuck
3. EGR valve opened stuck
Cause of
trouble
Engine
state
1. Wiring circuit failure (Power supply or Ground line open or shorted)
or EGR solenoid valve malfunction
2. EGR valve is stuck for a while or friction increase by over heating.
1. Severe engine vibration is occurred(Open stuck) or
lean fuel control(MAP sensor type).
2. lean fuel control(MAP sensor type), fuel adaptation is increased to positive
direction. Knocking is often taken place.
3 Severe engine vibration
(Engine is hard to start or severe engine vibration after start)
Normal
signal
Signal
wave when
trouble
detection
EGR valve operation can be checked only if it is
operated. So, it should be checked with working
acceleration pedal.
1. Always constant
EGR valve stuck is not checked with
signal,indirectly it can be checked with
O2 sensor signal. “Refer to O2 sensor
chapter”
56