P1491
DTC P1491 - POSITIVE CRANKCASE VENTILATION (BLOW-BY) FUNCTION PROBLEMOUTLINE 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 2.5 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)