The evaporative emissions system prevents hydrocarbon (HC) vapors from the fuel tank from escaping into the atmosphere where they could form photochemical smog. Gasoline vapors are collected in the charcoal canister. The Canister Closing Valve (CCV) closes off the air inlet into the canister for leak detection of the evaporative emission system. The CCV also prevents fuel vapors from escaping from the canister. When the engine purges the HC vapors from the canister, the clean air comes into the canister through the canister air-filter and the CCV.
ECM sets DTC P0449 if ECM detects and regards CCV is open circuit or fuel tank pressure is low as CCV open stuck.
Item
Detecting Condition
Possible cause
DTC Strategy
FTP behavior (CCV stuck closed)
Poor Connection
Open Power Circuit
Open Control Circuit
CCV
ECM
Enable Conditions
Canister Close Valve close
Canister Purge Valve close
Time after engine start > 560 sec
4?(39.2?) < ECT at start temp < 50?(122?)
ECT at start – IAT < 9.8?(49.64?)
0?(32?) < IAT temp < 42?(107.6?)
BARO > 74.5 kPa
15% < Fuel level < 85%
Duration of tank ventilation > 10 sec
Fuel System Status Closed loop
Accel. Pedal = 0%
Disable conditions : P0300 ~ P0308
Threshold value
FTP < -2.2 kPa
Diagnosis Time
5 sec
MIL On Condition
2 driving cycles
Specification
Coil Resistance(?)
23~26? (20?(68?))