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 |
| D2 | High pressure purge line pipe clogging | 60 s or less |
| E | Reference pressure measurement for judgment | 50 s or less |
| Z | Measurement of atmospheric pressure | 70 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)
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.
| Malfunction Criteria | Threshold Value | DTC |
|---|---|---|
| Judgment 1 |Pressure sensor maximum output value - Pressure sensor minimum output value| or Judgment 2 |
> 493 Pa (3.7 mmHg, 0.1 inHg) | P2404 |
| 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)
- 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.
| Malfunction Criteria | Threshold Value | DTC |
|---|---|---|
| <Pase D> Time of Pase D |
≤ 30 s | P1451 |
| <Pase D2> Reference pressure for judgment of the target negative pressure |
< -667 kPa (-37.298 mmHg, -1.5 inHg) | P04AF |
| <Large leak (0.04 inch)> Leak pressure |
≥ Map 4 | P0455 |
| <Very small leak (0.02 inch)> Leak pressure | > 0.018 inch reference pressure (Pa) and < Map 4 | P0456 |
Formula for threshold value = Reference pressure x 0.377 0.341
| Reference pressure for judgment (Pa) | -4856 | -4000 | -2750 | -1500 | -824 |
|---|---|---|---|---|---|
| Threshold Value (Pa) | -1785 | -1463 | -991 | -520 | -265 |
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.
| Malfunction Criteria | Threshold Value | DTC |
|---|---|---|
| Judgment 1 |Pressure sensor maximum output value - Pressure sensor minimum output value| |
> 493 Pa (3.7 mmHg, 0.1 inHg) | P2404 |
| or Judgment 2 Reference pressure for judgment |
< Value of Map 5 or > Value of Map 6 |
P2404 |
| or Judgment 3 |Reference pressure for setting the target negative pressure - Reference pressure for judgment| |
> 943 Pa (7 mmHg, 2.77 inHg) | 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 judgment Pa (mmHg, inHg) | -4536 (-34, -1.33) | -4642 (-34.8, -1.37) | -4749 (-35.6, -1.4) | -4856 (-36.4, -1.43) |
| Barometric pressure kPa (mmHg, inHg) | 70 (525, 20.7) | 80 (600, 23.6) | 90 (675, 26.6) | 100 (750, 29.5) |
|---|---|---|---|---|
| Reference pressure for judgment Pa (mmHg, inHg) | -824 (-6.1, -0.24) | -931 (-6.9, -0.27) | -1038 (-7.7, -0.3) | -1144 (-8.5, -0.33) |
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 as soon as a malfunction occurs.