DTC P0447: Evaporative Emission Control System Vent Control Circuit Open

Detect the open or short circuit of drain valve.

Judge NG when the ECM output level is different from the actual terminal level.

Always perform the diagnosis continuously.

• Abnormality Judgment 

  Judge NG when the continuous time of completing the malfunction criteria below becomes more than 2.5 seconds.

  Judgment Value 

  JUDGMENT VALUE CHART
  
  

  Malfunction Criteria	Threshold Value
  Ignition switch	ON
  Battery voltage	"GREATER THAN EQUAL TO" 10.9 V
  After engine starting	1 second or more
  Terminal output voltage when ECM sends OFF signal	Low

  Time Needed for Diagnosis:  2.5 seconds

  Malfunction Indicator Light Illumination:  Illuminates as soon as the malfunction occurs.

• Normality Judgment 

  Judge OK and clear the NG when the malfunction criteria below are completed.

  Judgment Value 

  JUDGMENT VALUE CHART
  
  

  Malfunction Criteria	Threshold Value
  Ignition switch	ON
  Battery voltage	"GREATER THAN EQUAL TO" 10.9 V
  After engine starting	1 second or more
  Terminal output voltage when ECM sends OFF signal	High

• When the OK idling cycle was completed 40 times in a row
• When "Clear Memory" was performed

• When the OK driving cycle was completed 3 times in a row
• When "Clear Memory" was performed

PCV control: Open the PCV solenoid.

Memorize the freeze frame data. (For test mode $02)