available?
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
Are any DTCs present other than
the following:
{
P0171, P0174, P2195 or
P2197?
Yes
Go to the appropriate DTC troubleshooting
procedures.
(See
DTC TABLE [MZI-3.5]
.)
No
Go to the next step.
4
PERFORM VISUAL INSPECTION
ON INTAKEAIR SYSTEM AND
ALL VACUUM HOSES
z
Turn the ignition switch off.
z
Check the intake air system for
leaks, obstructions, and damage.
z
Inspect the entire length of all the
vacuum hoses for:
{
Proper connections
{
Damage or cracks
{
Damaged or cracked
vacuum vacuum hose joint
z
Verify the integrity of the positive
crankcase ventilation system.
z
Verify that the PCV valve part
number is correct.
z
Is a concern present?
Yes
Repair if necessary. Then go to Step 7.
No
Go to the next step.
5
INSPECT FOR PRESENCE OF
VACUUM LEAK
NOTE:
z
Fuel trim values at idle are more
sensitive to a vacuum leak. The
vacuum leak (unmetered air)
represents a larger portion of
the total air flow at idle than at
part throttle.
z
The BARO PID is not a
commended PID to monitor
when diagnosing a vacuum leak.
BARO is calculated during high
Yes
No vacuum leak is present. Go to Step 8.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:30 AM
Page 111
© 2005 Mitchell Repair Information Company, LLC.