Diagnostic Method
| Mode | Explanation of Mode | Diagnosis Period |
|---|---|---|
| A | Vacuum pump operation confirmation and characteristics stability | 7 s |
| B | Measurement of reference pressure for setting the target negative pressure | 350 s |
| C | Switching valve operation confirmation | 12 s |
| D | Pipe clogging diagnosis and leak pressure measurement | 900 s |
| D2 | Pipe clogging diagnosis of high-pressure line | 60 s |
| E | Reference pressure measurement for judgment | 50 s |
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 | > -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.
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 | P2404 | |
| |Pressure sensor maximum output value - Pressure sensor minimum output value| | > 314Pa (2.355 mmHg, 0.1 inHg) | |
| or | ||
| Judgment 2 | ||
| Reference pressure for setting the target negative pressure | < Value of Map 2 | |
| or | ||
| Judgment 3 | ||
| Reference pressure for judgment | > Value of Map 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)) | -4 (-29.79, -1.2) | -4.1 (-30.593, -1.2) | -4.2 (-31.395, -1.2) | -4.3 (-32.19, -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)) | -0.9 (-7.065, -0.3) | -1 (-7.86, -0.3) | -1.2 (-8.663, -0.3) | -1.3 (-9.465, -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 | < 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.
Phase D
| Malfunction Criteria | Threshold Value | DTC |
|---|---|---|
| Phase D | ||
| Time for reaching the target | ≤27000 ms | P1451 |
| Phase D2 | ||
| Reference pressure for setting the target negative pressure | < -0.7 kPa (-5 mmHg, -0.2 inHg) |
P04AF |
| <Large leak (0.04 inch)> | P0455 | |
| Leak pressure | ≥ Value of Map 6 | |
| <Very small leak (0.02 inch)> | P0456 | |
| Leak pressure | > Reference pressure of 0.018 inch (Pa) and < Value of Map 6 |
| Reference pressure (Pa) | -4856 | -4000 | -2750 | -1500 | -824 |
|---|---|---|---|---|---|
| Threshold Value (Pa) | -1785 | -1463 | -991 | -520 | -265 |
Formula for threshold value = Reference pressure x0.377-0.341 mmHg
Time needed for diagnosis: 24 min
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| |
> 314Pa (2.355 mmHg, 0.1 inHg) | P2404 |
| or | ||
| Judgment 2 Reference pressure for judgment |
< Value of Map 4 or > Value of Map 5 |
P2404 |
| or | ||
| Judgment 3 |Reference pressure for setting the target negative pressure - Reference pressure for judgment| |
> 941Pa (7.058 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)) | -4.5 (-34.02, -1.3) | -4.6 (-34.815, -1.4) | -4.7 (-35.618, -1.4) | -4.9 (-36.42, -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)) | -0.8 (-6.18, -0.2) | -0.9 (-6.983, -0.3) | -1 (-7.785, -0.3) | -1.1 (-8.58, -0.3) |
Time needed for diagnosis: Approx. 24 min
Malfunction will be confirmed at next engine start.
Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.