Diagnostic Method
| Mode | Explanation of Mode | Diagnosis period |
|---|---|---|
| A | Vacuum pump operation confirmation and characteristics stability | 7 s or less |
| B | Measurement of reference pressure for setting the target negative pressure | 350 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 |
| E | Reference pressure measurement for judgment | 50 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.
JUDGMENT VALUE SPECIFICATIONSMalfunction Criteria Threshold Value DTC Pressure sensor output value More than -224Pa (-1.68 mmHg, -0.1 inHg) P2404 - Mode B (Measurement of reference pressure for setting the target negative pressure)
Judgment 1
Purpose: Judge the reference pressure stability.
Judge as NG when the following conditions are established.
Judgment 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 SPECIFICATIONSMalfunction Criteria Threshold Value DTC Judgment 1
|Pressure sensor maximum output value - Pressure sensor minimum output value|
Or,
Judgment 2More than 314Pa (2.355 mmHg, 0.1 inHg) P2404 Reference pressure for setting the target negative pressure Less than value of Map2 Or, More than value of Map3 P2404 BAROMETRIC PRESSURE SPECIFICATIONS - MAP 2Barometric pressure (kPa (mmHg, inHg)) 70 (525, 20.7 inHg) 80 (600, 23.6 inHg) 90 (675, 26.6 inHg) 100 (750, 29.5 inHg) Reference pressure for setting the target negative pressure (kPa (mmHg, inHg)) -4 (-29.790, -1.2 inHg) -4.1 (-30.593, -1.2 inHg) -4.2 (-31.395, -1.2 inHg) -4.3 (-32.190, -1.3 inHg) BAROMETRIC PRESSURE SPECIFICATIONS - MAP 3Barometric pressure (kPa (mmHg, inHg)) 70 (525, 20.7 inHg) 80 (600, 23.6 inHg) 90 (675, 26.6 inHg) 100 (750, 29.5 inHg) Reference pressure for judgment (kPa (mmHg, inHg)) -0.9 (-7.065, -0.3 inHg) -1 (-7.860, -0.3 inHg) -1.2 (-8.663, -0.3 inHg) -1.3 (-9.465, -0.4 inHg) - 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.
JUDGMENT VALUE SPECIFICATIONSMalfunction Criteria Threshold Value DTC Pressure sensor output value - Reference pressure for setting the target negative pressure Less than 224Pa (1.68 mmHg, 0.1 inHg) P2404 - Mode D (Clogging of pipe diagnosis and leak pressure measurement)
- 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.
- 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 SPECIFICATIONSMalfunction Criteria Threshold Value DTC Time required to reach to the target negative pressure 25216 ms or less P1451 <Large leak (0.04 inch)> P0455 Leak pressure Value of Map4 or more <Very small leak (0.02 inch)> P0456 Leak pressure More than 0.018 inch reference pressure (Pa) and Less than value of Map4 REFERENCE PRESSURE FOR JUDGMENT SPECIFICATIONS - MAP 4Reference pressure for judgment (Pa) -4856 -4000 -2750 -1500 -824 Threshold Value (Pa) -1785 -1463 -991 -520 -265 Formula for threshold value = Reference pressure x 0.377 - 0.341
- Clogging of pipe
- Mode E (Measurement of reference pressure for judgment)
Judgment 1
Purpose: Judge the reference pressure stability.
Judge as NG when the following conditions are established.
Judgment 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 3
Purpose: Judge the presence of evaporative emission system leak.
Judge as NG when the following conditions are established.
JUDGMENT VALUE SPECIFICATIONSMalfunction Criteria | Threshold Value 1 DTC Judgment 1
|Pressure sensor maximum output value - Pressure sensor minimum output value| Or,More than 314Pa (2.355 mmHg, 0.1 inHg) P2404 Judgment 2 Reference pressure for judgment Less than value of Map5 Or, More than value of Map6 P2404 Or, Judgment 3 |Reference pressure for setting the target negative pressure - Reference pressure for judgement| More than 0.9 kPa (7.058 mmHg, 0.3 inHg) P2404 BAROMETRIC PRESSURE SPECIFICATIONS - MAP 5Barometric pressure (kPa (mmHg, inHg)) 70 (525, 20.7 inHg) 80 (600, 23.6 inHg) 90 (675, 26.6 inHg) 100 (750, 29.5 inHg) Reference pressure for judgment (kPa (mmHg, inHg)) -4.5 (-34.020, -1.3 inHg) -4.6 (-34.815, -1.4 inHg) -4.7 (-35.618, -1.4 inHg) -4.9 (-36.420, -1.4 inHg) BAROMETRIC PRESSURE SPECIFICATIONS - MAP 6Barometric pressure (kPa (mmHg, inHg)) 70 (525, 20.7 inHg) 80 (600, 23.6 inHg) 90 (675, 26.6 inHg) 100 (750, 29.5 inHg) Reference pressure for judgment (kPa (mmHg, inHg)) -0.8 (-6.180, -0.2 inHg) -0.9 (-6.983, -0.3 inHg) -1 (-7.785, -0.3 inHg) -1.1 (-8.580, -0.3 inHg)
Time needed for diagnosis: 23 min
Confirm the malfunction at next engine start.
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.