line repair information availability.
z
Is any related Service Bulletins available?
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
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-3.7]
.)
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.
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 engine
load, when the vacuum leak represents a
Yes No vacuum leak is present. Go to Step 8.
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:35 AM
Page 107
© 2005 Mitchell Repair Information Company, LLC.
