P0448

DTC P0448 - EVAPORATIVE EMISSION CONTROL SYSTEM VENT CONTROL CIRCUIT SHORTED

OUTLINE OF DIAGNOSIS
Detect the short circuit of drain valve.
Judge NG when the ECU output level is not equal to the actual terminal level.




COMPONENT DESCRIPTION




ENABLE CONDITION

GENERAL DRIVING CYCLE
Perform the diagnosis continuously after starting the engine.

DIAGNOSTIC METHOD




- Abnormality Judgment
Judge NG when the continuous time until completing the malfunction criteria become more than time (2.5 seconds) needed for diagnosis.

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.




- Normality Judgment
Judge OK and clear the NG when the malfunction criteria are completed.

DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed

MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed

FAIL SAFE
Open PCV solenoid.

ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)