P1491
DTC P1491 POSITIVE CRANKCASE VENTILATION (BLOW-BY) FUNCTION PROBLEM1. OUTLINE OF DIAGNOSIS
Detect the blow-by hose release abnormality.
Judge NG when the diagnosis terminal voltage is high.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
5. DIAGNOSIS METHOD
- Abnormality Judgment
Judge NG when the continuous time until completing the malfunction criteria becomes more than 2.5 seconds.
- Normality Judgment
Judge OK and clear NG when the malfunction criteria is completed.
6. DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed
7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was performed 3 times in a row
- When "Clear Memory" was performed
8. FAIL SAFE
None
9. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)