DIAGNOSTIC PROCEDURE
DTC P0172, P0175 (MZI-3.7) DIAGNOSTIC PROCEDURE
POSSIBLE CAUSE
z
Fuel rail pressure sensor bias
z
Purge solenoid valve is leaking when the canister is full
Base engine:
z
Engine oil contamination
Intake Air System:
z
Damaged or contaminated MAF sensor
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
Are any DTCs present other than the
following:
{
P0172, P0175, P2196 or P2198?
Yes
Go to the appropriate DTC
troubleshooting procedures. (See
DTC
TABLE [MZI-3.7]
.)
No
Go to the next step.
4
INSPECT ENTIRE INTAKE AIR SYSTEM
FOR DEBRIS, BLOCKAGE OR OTHER
DAMAGE
z
Check the intake air system for obstructions,
restrictions, and damage.
Yes
Repair if necessary.
Then go to Step 9.
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 113
© 2005 Mitchell Repair Information Company, LLC.
