DTC P0300 [MZI-3.5]
DTC P0300 (MZI-3.5) DETECTION CONDITION AND POSSIBLE CAUSES
of the above conditions?
4
VERIFY TROUBLESHOOTING OF
DTC P0297 HAS BEEN
COMPLETED
z
Verify that all disconnected
connectors are reconnected.
z
Turn the ignition switch to the ON
position (Engine off).
z
Clear the DTC from the PCM
memory using the M-MDS.
z
Start the engine and run it at idle.
z
Retrieve DTCs using the M-MDS.
z
Is the PENDING CODE for this
DTC present?
Yes
Replace PCM, then go to the next step.
(see
PCM
REMOVAL/INSTALLATION [MZI-
3.5]
.)
No
Go to the next step.
5
VERIFY AFTER REPAIR
PROCEDURE
z
Perform "AFTER REPAIR
PROCEDURE".
(See
AFTER REPAIR
PROCEDURE [MZI-3.5]
.)
z
Are any DTC present?
Yes
Go to the applicable DTC inspection.
(See
DTC TABLE [MZI-3.5]
.)
No
Troubleshooting completed.
DTC P0300
Random misfire detected
DETECTION
CONDITION
z
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 number of misfires that occurred at 200 crankshaft
revolutions and 1,000 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.
z
CMP sensor malfunction
z
CKP sensor malfunction
z
Ignition coil malfunction
z
Ignition system malfunction
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:31 AM
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