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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DO) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0455 Evaporative Emission System Leak Detected (Large Leak) >> Diagnostic Method >> Mode D (Clogging of pipe diagnosis and leak pressure measurement) >> Leak pressure measurement

Leak pressure measurement

Purpose: Measure the pressure (leak pressure) when the evaporative emission system becomes the negative pressure by the vacuum pump.

Store the pressure as a leak pressure while the following conditions are met.

JUDGMENT VALUE

Conditions for storing the leak pressure Threshold Value
When any one of the followings is established.  
  • Reference pressure for setting the target negative pressure - Pressure sensor output value
≥ Value of Map 4
  • Pressure sensor output value
< -5 kPa (-37.298 mmHg, -1.5 inHg)
  • Time of negative pressure introduction
≥ 900000 ms