EGR cooler was installed to supply combustion chamber with more EGR to satisfy a law regarding exhast gas.
EGR cooler bypass vavle makes it possible to recirculate EGR gas to combustion chamber without cooling when EGR gas temperature is low.
P245D is set when EGR cooler bypass valve control circuit is short to battery for 1 sec.
Item
Detecting Condition
Possible Cause
DTC Strategy
Voltage Monitoring
EGR cooler bypass valve circuit
EGR cooler bypass solenoid component
Enable Conditions
IG key ON
Threshold value
Control circuit is short to battery
Diagnosis Time
1 sec.
Fail Safe
Fuel cut
NO
-
EGR Off
Fuel Limit
Check Lamp
Resistance
28.3 ~ 31.1? (20?)
Fig 1) Control signal waveform when engine coolant temperature is lower than 50? (not warmed condition)
(+) duty 5%
Fig 2) Control signal waveform when engine coolant temperature is higher than 50? (warmed condition)
(+) duty 95%