DIAGNOSTIC PROCEDURE
DTC P0442, P0456 (MZI-3.7) DIAGNOSTIC PROCEDURE
DETECTION
CONDITION
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
INFORMATION AVAILABILITY
z
Verify related Service Bulletins and/or on-
line repair information availability.
z
Is any related Service Bulletins available?
Yes
Perform repair or diagnosis according to
the available Service Bulletins.
z
If the vehicle is not repaired, go to
the next step.
No
Go to the next step.
3
VERIFY RELATED PENDING CODE OR
STORED DTCs
z
Turn the ignition switch off then to the ON
position (Engine off).
z
Verify related pending code or stored DTCs.
z
Is other DTCs present?
Yes
Go to the appropriate DTC
troubleshooting. (See
DTC TABLE
[MZI-3.7]
.)
No
Go to the next step.
4
EVAP SYSTEM LEAK TEST
z
Carry out the EVAP system leak inspection
using the M-MDS. (See
ENGINE
CONTROL SYSTEM OPERATION
INSPECTION [MZI-3.7]
.)
z
Is small or large leakage detected?
Yes Go to the next step.
No
Go to Step 6.
EVAP SYSTEM LEAK TEST
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:37 AM
Page 201
© 2005 Mitchell Repair Information Company, LLC.
