DTC P0442, P0456: Notes
DTC P0442, P0456 (MZI-3.5) DETECTION CONDITION AND POSSIBLE CAUSES
| DTC P0442 |
P0442: Evaporative emission system leak detected (small leak) |
| DTC P0456 |
P0456: Evaporative emission system leak detected (very small leak) |
| DETECTION CONDITION |
- P0442 indicates that a leak has been detected as small as 1 mm (0.04in) in the EVAP vapor management valve solenoid system when there is less than 0.625 kPa (PID FTP_H2O displays "2.5") bleed-up over 15 s at 75% fuel fill. Bleed-up and evaluation time vary as a function of fuel fill level. The vapor generation limit is more than 0.625 kPa (PID FTP_H2O displays "2.5") over 120 s.
- P0456 indicates that a fuel vapor leak from an opening as small as 0.508 mm (0.020 in) has been detected by the EVAP running loss monitor test.
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| POSSIBLE CAUSE |
- After-market EVAP hardware (such as fuel-filler cap) nonconforming to required specifications.
- Small holes or cuts in fuel vapor hoses/tubes (P0442, P0456).
- CV solenoid stays partially open on closed command.
- Damaged, cross-threaded or loosely installed fuel-filler cap.
- EVAP system component seals leaking.
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