Mazda CX-9 Grand Touring 2009 Manual page 971

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
line repair information availability.
Is any related Service Bulletins available?
VERIFY RELATED PENDING CODE OR
STORED DTCS
Turn the ignition switch off then to the ON
position (Engine off).
3
Verify related PENDING CODE or stored
DTCs.
Are any DTCs present other than the
following:
P0171, P0174, P2195 or P2197?
PERFORM VISUAL INSPECTION ON
INTAKEAIR SYSTEM AND ALL VACUUM
HOSES
Turn the ignition switch off.
Check the intake air system for leaks,
obstructions, and damage.
Inspect the entire length of all the vacuum
hoses for:
4
Proper connections
Damage or cracks
Damaged or cracked vacuum vacuum
hose joint
Verify the integrity of the positive crankcase
ventilation system.
Verify that the PCV valve part number is
correct.
Is a concern present?
INSPECT FOR PRESENCE OF VACUUM
LEAK
NOTE:
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.
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
2008 Mazda CX-9 Grand Touring
No
Yes
No
Yes Repair if necessary. Then go to Step 7.
No
Yes No vacuum leak is present. Go to Step 8.
the next step.
Go to the next step.
Go to the appropriate DTC
troubleshooting procedures. (See DTC
TABLE [MZI-3.7].)
Go to the next step.
Go to the next step.