DIAGNOSTIC PROCEDURE
DTC P0133, P0139, P0153, P0159 (MZI-3.7) DIAGNOSTIC PROCEDURE
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
PERFORM KOER SELF-TEST
z
Verify that the engine is at normal
operating temperature.
z
Perform the KOER self-test.
z
Are DTCs P0040, P0041 or P1127
present?
Yes
Go to the appropriate DTC troubleshooting.
(See
DTC TABLE [MZI-3.7]
.)
No
Go to the next step.
4
INSPECT FOR UNMETERED AIR
LEAKS
z
Carefully inspect the following areas
for potential air leaks:
{
Hoses connecting to the MAF
sensor assembly
{
Hoses connecting to the throttle
body
{
Intake manifold gasket leaks
{
PCV system
{
The vacuum lines are
disconnected
{
Improperly seated engine oil
dipstick, tube or oil filler cap
NOTE:
z
Fuel calculations can be affected by
unmetered air leaks.
Yes
Repair the source of the air leak. Then go to
Step 17.
No
Go to the next step.
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 90
© 2005 Mitchell Repair Information Company, LLC.
