DIAGNOSTIC PROCEDURE
DIAGNOSTIC PROCEDURE
STEP INSPECTION
RESULTS ACTION
1
Inspect for the following:
z
Vacuum leakage
z
Proper fuel quality (such as
proper octane, contamination,
winter/summer blend)
z
Loose bands on intake-air system
z
Cracks on intake-air system parts
z
Intake-air system restriction
(such as air cleaner element,
fresh air duct.)
Are all items normal?
Yes
Go to the next step.
No
Service if necessary.
Repeat Step 1.
2
Connect the M-MDS to the DLC-2.
Turn the ignition switch to the ON
position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
Yes
DTC is displayed:
Go to the appropriate DTC inspection.
(see
DTC TABLE [MZI-3.5]
.)
No
No DTC is displayed:
Go to the next step.
3
Is engine overheating?
Yes
Go to symptom troubleshooting "No. 17
Cooling system concerns-Overheating".
(See
NO.17 COOLING SYSTEM
CONCERNS-OVERHEATING
[MZI-3.5]
.)
No
Go to the next step.
4
Inspect the ignition coil related wiring
harness condition (intermittent open or
short circuit) for all cylinders.
Are wiring harness conditions normal?
Yes
Go to the next step.
No
Repair the wiring harnesses.
5
Inspect the spark plug conditions.
Is spark plug wet, covered with carbon
or grayish white?
Yes
Spark plug is wet or covered with
carbon:
Inspect for fuel leakage from fuel
injector.
Spark plug is grayish white:
Inspect the fuel injector for clogging.
No
Install the spark plugs on original
cylinders.
Go to the next step.
6
Visually inspect the CKP sensor and
teeth of crankshaft pulley.
Are the CKP sensor and teeth of
Yes
Go to the next step.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:27:36 AM
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