Dtc P0301, P0302, P0303, P0304 [Z6] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Perform "ENGINE COOLANT LEAKAGE
INSPECTION".
(See ENGINE COOLANT LEAKAGE
INSPECTION.)
• Is there any malfunction?
VERIFY TROUBLESHOOTING OF
MISFIRE DTC COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the PCM memory
using the WDS or equivalent.
22
• Perform the "PCM Adaptive Memory
Produce Drive Mode".
(See OBD DRIVE MODE
• Is the PENDING CODE for this DTC
present?
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR
PROCEDURE".
23
(See AFTER REPAIR PROCEDURE
[Z6].)
• Are any DTCs present?

DTC P0301, P0302, P0303, P0304 [Z6]

DTC P0301
DTC P0302
DTC P0303
DTC P0304
• The PCM monitors the CKP sensor input signal interval time. The PCM calculates the
change of interval time for each cylinder. If the change of interval time exceeds the
preprogrammed criteria, the PCM detects a misfire in the corresponding cylinder. While
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 preprogrammed criteria, the
DETECTION
CONDITION
PCM determines that a misfire, which can damage the catalytic converter or affect
emission performance, has occurred.
Diagnostic support note
• This is a continuous monitor (Misfire).
Downloaded from
No Go to the next step.
Yes
No Go to the next step.
[Z6].)
Yes
No DTC troubleshooting completed.
Cylinder No.1 misfire detected
Cylinder No.2 misfire detected
Cylinder No.3 misfire detected
Cylinder No.4 misfire detected
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Then go to the next step.
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION
Go to the applicable DTC inspection.
(See DTC TABLE [Z6].)
- automotive repair manuals website
[Z6].)
B3E010200300W02