DTC P0442, P0456 [MZI-3.5]
DTC P0442, P0456 (MZI-3.5) DETECTION CONDITION AND POSSIBLE CAUSES
DIAGNOSTIC PROCEDURE
DTC P0442, P0456 (MZI-3.5) DIAGNOSTIC PROCEDURE
z
Is the PENDING CODE for this
DTC present?
8
VERIFY AFTER REPAIR
PROCEDURE
z
Perform the "AFTER REPAIR
PROCEDURE".
(See
AFTER REPAIR
PROCEDURE [MZI-3.5]
.)
z
Are any DTC present?
Yes
Go to the applicable DTC inspection.
(See
DTC TABLE [MZI-3.5]
.)
No
Troubleshooting completed.
DTC P0442
P0442: Evaporative emission system leak detected (small leak)
DTC P0456
P0456: Evaporative emission system leak detected (very small leak)
DETECTION
CONDITION
z
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.
z
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.
POSSIBLE CAUSE
z
After-market EVAP hardware (such as fuel-filler cap) nonconforming to
required specifications.
z
Small holes or cuts in fuel vapor hoses/tubes (P0442, P0456).
z
CV solenoid stays partially open on closed command.
z
Damaged, cross-threaded or loosely installed fuel-filler cap.
z
EVAP system component seals leaking.
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA
HAS BEEN RECORDED
z
Has FREEZE FRAME DATA
been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA on the
repair order, then go to the next step.
2
VERIFY RELATED REPAIR
Yes
Perform repair or diagnosis according to
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:32 AM
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© 2005 Mitchell Repair Information Company, LLC.