P1491

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

1. 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 below becomes more than 2.5 second.




^ Normality Judgment
Judge OK and clear NG when the malfunction criteria below 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 diagnosis value and trouble standard value. (For test mode $06)