Mazda RX-8 Manual page 714

DTC P0301, P0302
DTC P0301 Front rotor misfire detected
DTC P0302 Rear rotor misfire detected
•
DETECTION
CONDITION
•
•
•
•
•
•
•
•
•
•
•
•
POSSIBLE
•
CAUSE
•
•
•
The PCM monitors eccentric shaft position sensor input signal interval time. The
PCM calculates the change of the interval time for each rotor. If the change of
interval time exceeds the preprogrammed criteria, the PCM detects a misfire in the
corresponding rotor. While the engine is running, the PCM counts the number of
misfires that occurred at 200 eccentric shaft revolutions and 1,000 eccentric shaft
revolutions and calculates misfire ratio for each eccentric shaft revolution. If the
ratio exceeds the preprogrammed criteria, the 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).
The MIL illuminates if the PCM detects the misfire which affects emission
performance in two consecutive drive cycles or in one drive cycle while the DTC for
the same malfunction has been stored in the PCM.
The MIL flashes if the PCM detects the misfire which can damage the catalytic
converter during the first drive cycle. Therefore, PENDING CODE is not available
while the MIL flashes.
PENDING CODE is available if the PCM detects the misfire which affects emission
performance during the first drive cycle.
FREEZE FRAME DATA is available.
The DTC is stored in the PCM memory.
Eccentric shaft position sensor malfunction
Spark plug malfunction
High-tension lead malfunction
Excess air suction in intake-air system
Fuel injector malfunction
Leakage engine coolant
Insufficient compression
Metering oil pump malfunction
Engine oil condition malfunction
Rised oil pressure
Oil passage malfunction
Engine malfunction
ECT sensor malfunction
Fuel line pressure malfunction
Fuel pump unit malfunction
(w) Engine Diagnostics & Control
Page 151