P1491

DTC P1491 - POSITIVE CRANKCASE VENTILATION (BLOW-BY) FUNCTION PROBLEM

OUTLINE OF DIAGNOSIS
Detect the blow-by hose release abnormality. Judge NG when the diagnosis terminal voltage is high.




COMPONENT DESCRIPTION




ENABLE CONDITION

GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.

DIAGNOSIS METHOD




- Abnormality Judgment
Judge NG when the continuous time until completing the malfunction criteria becomes more than 1 second.




- Normality Judgment
Judge OK and clear NG when the malfunction criteria is 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 performed 3 times in a row
- When "Clear Memory" was performed

FAIL SAFE None

ECM OPERATION AT DTC SETTING
- Memorize the freeze frame data. (For test mode $02)
- Memorize the diagnosis value and trouble standard value. (For test mode $06)