DIAGNOSTIC PROCEDURE
DTC P0068 (MZI-3.7) DIAGNOSTIC PROCEDURE
DETECTION
CONDITION
z
The PCM monitors a vehicle operation rationality check by comparing sensed
throttle position to mass air flow readings. If during a KOER self-test, the
comparison of the TP sensor and MAF sensor readings are not consistent with
the calibrated load values, test fails and a DTC is stored in continuous memory.
POSSIBLE
CAUSE
z
Air leak between MAF sensor and throttle body
z
TP sensor or MAF sensor malfunction
z
TP sensor not seated correctly
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED
z
Has FREEZE FRAME DATA been
recorded?
Yes Go to next step.
No
Record FREEZE FRAME DATA on the
repair order, then go to next step.
2
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
z
Verify related Service Bulletins
availability.
z
Is any related Service Bulletins
available?
Yes
Perform repair or diagnosis according to
available Service Bulletins.
z
If vehicle is not repaired, go to next
step.
No
Go to next step.
3
VERIFY RELATED PENDING CODE OR
STORED DTC
z
Verify the related PENDING CODE or
stored DTCs.
z
Are other DTCs present?
Yes
Go to appropriate DTC inspection. (See
DTC
TABLE [MZI-3.7]
.)
No
Go to next step.
4
INSPECT FOR INLET AIR LEAKS
z
Listen for air noise around the MAF
sensor and throttle body while the engine
is running.
z
Is a concern present?
Yes Repair as necessary. Go to Step 8.
No
Go to next step.
5
INSPECT FOR TP2 SIGNAL HIGH
VERSUS LOAD WHILE DRIVING THE
CVEHICLE
z
Turn the ignition switch to the ON
position (Engine running).
z
Access the TP2 and LOAD PIDs using
Yes
Replace the malfunctioning part, then 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 10:08:34 AM
Page 49
© 2005 Mitchell Repair Information Company, LLC.
