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
JUDGMENT VALUE SPECIFICATION
| Malfunction Criteria | Threshold Value | DTC |
|---|---|---|
| Time required to reach to the target negative pressure | 25216ms 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 Map6 |
MAP 4 SPECIFICATION
| Reference 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