Mazda CX-9 Grand Touring 2009 Manual page 1021

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
DTC P0305 P0305: Cylinder No.5 misfire detected
DTC P0306 P0306: Cylinder No.6 misfire detected
DTC P0316 P0316: Misfire detected on startup (first 1000 revolutions)
The PCM monitors the crankshaft position sensor input signal interval time. The
PCM calculates the change of the interval time for each cylinder. If the change of
interval time exceeds the pre-programmed criteria, the PCM detects a misfire in
the corresponding cylinder, when the engine is running, the PCM counts the
DETECTION
number of misfires that occurred at 200 crankshaft revolutions and 1,000
CONDITION
crankshaft revolutions and calculates the misfire ratio for each crankshaft
revolution. If the ratio exceeds the pre-programmed criteria, the PCM determines
that a misfire, which can damage the catalytic converter or affect emission
performance, has occurred.
Spark plug malfunction
Ignition system malfunction
Ignition coil malfunction
POSSIBLE Fuel injector malfunction
CAUSE
Air suction in intake air system (between dynamic chamber and cylinder head)
Inadequate engine compression due to engine internal malfunction
Related connector or terminal malfunction
Related wiring harness malfunction
DIAGNOSTIC PROCEDURE
DTC P0301, P0302, P0303, P0304, P0305, P0306, P0316 (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP
VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
1
Has FREEZE FRAME DATA been recorded?
VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
2
Verify related Service Bulletins and/or on-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
3
position (Engine off).
Verify related pending code or stored DTCs.
Are other DTCs present?
2008 Mazda CX-9 Grand Touring
INSPECTION ACTION
Yes Go to the next step.
Record FREEZE FRAME DATA on the
No
repair order, then go to the next step.
Perform repair or diagnosis according to
the available Service Bulletins.
Yes
If the vehicle is not repaired, go to
the next step.
No Go to the next step.
Go to the appropriate DTC
Yes troubleshooting. (See DTC TABLE
[MZI-3.7].)
No Go to the next step.