Diagnostic Method

Mode	Explanation of Mode	Diagnosis Period
A	Vacuum pump operation confirmation and characteristics stability	7 s or less & 300 s
B	Measurement of reference pressure for setting the target negative pressure	40 s or less
C	Switching valve operation confirmation	12 s or less
D	Clogging of pipe diagnosis and leak pressure measurement	900 s or less
D2	Pipe clogging of the high pressure line Solenoid valve for secondary purge stuck closed	60 s
E	Reference pressure measurement for judgment	40 s or less

Mode A (Vacuum pump operation confirmation and characteristics stability) 

Purpose: Detect the vacuum pump operation trouble.

Judge as NG when the following conditions are established.

Judge as OK if the following conditions are not established, and warm up for five minutes to stabilize the vacuum pump characteristics.

Malfunction Criteria	Threshold Value	DTC
Pressure sensor output value	> -224 Pa (-1.7 mmHg, -0.1 inHg)	P2404

Mode B (Measurement of reference pressure for setting the target negative pressure) 

1. Purpose: Judge the reference pressure stability.

   Judge as NG when the following conditions are established.

   JUDGMENT VALUE SPECIFICATION
   
   

   Malfunction Criteria	Threshold Value	DTC
   |Pressure sensor maximum output value - Pressure sensor minimum output value|	> 493 Pa (3.7 mmHg, 0.1 inHg)	P2404

2. Purpose: Judge whether the reference pressure is within the normal range, and detect the vacuum pump and orifice malfunctions.

   Judge as NG when the following conditions are established.

   JUDGMENT VALUE SPECIFICATION
   
   

   Malfunction Criteria	Threshold Value	DTC
   Reference pressure for setting the target negative pressure	< Value of Map 2 or > Value of Map 3	P2404

Barometric pressure kPa (mmHg, inHg)	70 (525, 20.7)	80 (600, 23.6)	90 (675, 26.6)	100 (750, 29.5)
Reference pressure for setting the target negative pressure Pa (mmHg, inHg)	-3972 (-29.8, -1.2)	-4079 (-30.6, -1.2)	-4186 (-31.4, -1.2)	-4292 (-32.2, -1.3)

Barometric pressure kPa (mmHg, inHg)	70 (525, 20.7)	80 (600, 23.6)	90 (675, 26.6)	100 (750, 29.5)
Reference pressure for setting the target negative pressure Pa (mmHg, inHg)	-942 (-7.1, -0.3)	-1048 (-7.9, -0.3)	-1155 (-8.7, -0.3)	-1262 (-9.5, -0.4)

Mode C (Switching valve operation confirmation) 

Purpose: Measure the pressure increase when switching valve is changed from open to close, and detect the stuck to open/close malfunctions of the switching valve.

Judge as NG when the following conditions are established.

Malfunction Criteria	Threshold Value	DTC
Pressure sensor output value - Reference pressure for setting the target negative pressure	< 224 Pa (1.7 mmHg, 0.1 inHg)	P2404

Mode D (Clogging of pipe diagnosis and leak pressure measurement) 

1. Clogging of pipe 

   Purpose: Measure the time required for the evaporative emission system to reach the target negative pressure by the vacuum pump, and detect the clogging of pipe trouble.

   Judge as clogging of pipe malfunction if the evaporative emission system reaches to the target negative pressure within the specified time.

2. 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.

Phase D2

Malfunction Criteria	Threshold Value	DTC
Phase D Time required to reach to the target negative pressure or	≤ 27000 ms	P1451
Phase D2 Reference pressure for judgment	< -668 kPa (-5011.25 mmHg, -197.29 inHg)

Time Needed for Diagnosis:  24 min

Mode E (Measurement of reference pressure for judgment) 

1. Purpose: Judge the reference pressure stability.

   Judge as NG when the following conditions are established.

   JUDGMENT VALUE SPECIFICATION
   
   

   Malfunction Criteria	Threshold Value	DTC
   |Pressure sensor maximum output value - Pressure sensor minimum output value|	> 493 Pa (3.7 mmHg, 0.1 inHg)	P2404

2. Purpose: Judge whether the reference pressure is within the normal range, and detect the vacuum pump and orifice malfunctions. Judge the vacuum pump performance stability.

   Judge as NG when the following conditions are established.

   JUDGMENT VALUE SPECIFICATION
   
   

   Malfunction Criteria	Threshold Value	DTC
   Reference pressure for judgment	< Value of Map 2 or > Value of Map 3	P2404

3. Purpose: Judge the presence of evaporative emission system leak.

   Judge as NG when the following conditions are established.

   JUDGMENT VALUE SPECIFICATION
   
   

   Malfunction Criteria	Threshold Value	DTC
   < Large leak (0.04 inch) >		P0455
   Leak pressure	≥ lleakjdg (Pa)
   lleakjdg = (Reference pressure for judgment) X 0.377 - (-45.5)
   < Very small leak (0.02 inch) >		P0456
   Leak pressure	< lleakjdg (Pa)

   Time Needed for Diagnosis:  24 min

   At next engine start, confirm whether the enable conditions are satisfied even though refueling has been done during soaking, and determine the malfunction.

   Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.