Diagnostic Method
| Mode | Explanation of Mode | DTC | Diagnosis time |
|---|---|---|---|
| A | Vacuum pump operation confirmation and characteristics stability | P2404 | 7 s or less |
| B | Measurement of reference pressure for setting the target negative pressure | P2404 | 350 s or less |
| C | Switching valve operation confirmation | P2404 | 12 s or less |
| D | Clogging of pipe diagnosis and leak pressure measurement | P1451 | 1100 s or less |
| D2 | Check valve open stuck | P04AE | 30 s or less |
| E | 0.04 inch leak pressure measurement | P0455 | 50 s or less |
| 0.02 inch leak pressure measurement | P0456 | ||
| Reference pressure measurement for judgment | P2401 |
<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 | More than -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, 3
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> Reference pressure for setting the target negative pressure or <Judgment 3> Reference pressure for judgment |
More than 493 Pa (3.7 mmHg, 0.1 inHg) Less than value of Map2 More than value of Map3 |
P2404 P2404 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 (kPa (mmHg, inHg)) | -3.97 (-30, -1.2) | -4.08 (-31, -1.2) | -4.19 (-31, -1.2) | -4.29 (-32, -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 (kPa (mmHg, inHg)) | -0.94 (-7.1, -0.3) | -1.05 (-7.9, -0.3) | -1.16 (-8.7, -0.3) | -1.26 (-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 | Less than 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 |
|---|---|---|
| <Phase D> Time required to reach to the target negative pressure <Phase D2> Reference pressure for judgment of the target negative pressure <Large leak (0.04 inch)> Leak pressure <Very small leak (0.02 inch)> Leak pressure |
40.9 seconds or less More than -0.179 kPa (-1.478 mmHg, -0.058 inHg) Value of Map6 or more More than 0.018 inch reference pressure and Less than value of Map6 |
P1451 P04AE P0455 P0456 |
| Reference pressure (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
<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| or <Judgment 2> Reference pressure for judgment or <Judgment 3> |
More than 493 Pa (3.7 mmHg, 0.1 inHg) Less than value of Map4 or More than value of Map5 |
P2404 P2404 |
| | Reference pressure for setting the target negative pressure - Reference pressure for judgment| | More than 941 Pa (7.1 mmHg, 0.3 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 (kPa (mmHg, inHg)) | -4.54 (-34.1, -1.3) | -4.64 (-34.8, -1.4) | -4.75 (-35.6, -1.4) | -4.86 (-36.5, -1.4) |
| 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 (kPa (mmHg, inHg)) | -0.82 (-6.15, -0.2) | -0.93 (-6.98, -0.3) | -1.04 (-7.8, -0.3) | -1.14 (-8.55, -0.3) |
Time needed for diagnosis: 27 min
Confirm the malfunction at next engine start.
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.