Troubleshooting

DTC P0302 Cylinder No. 2 Misfire Detected

CIRCUIT DESCRIPTION
Misfire: The ECM uses the crankshaft position sensor and camshaft position sensor to monitor changes in the crankshaft rotation for each cylinder.
The ECM counts the number of times the engine speed change rate indicates that misfire has occurred. When the misfire rate equals or exceeds the count indicating that the engine condition has deteriorated, the MIL lights up.
If the misfire rate is high enough and the driving conditions will cause catalyst overheating, the MIL blinks when misfiring occurs.





DETECTING CONDITION

HINT: When the 2 or more codes for a misfiring cylinder are recorded repeatedly but no Random Misfire code is recorded, it indicates that the misfires were detected and recorded at different times.





WIRING DIAGRAM





Reference INSPECTION USING OSCILLOSCOPE
INJECTOR SIGNAL WAVEFORM
- With the engine idling, measure between terminals # 10 ~ # 60 and E01 of ECM.

HINT: The correct waveform is as shown.

Step 1:

Step 2:

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Step 5:

Step 6:

Step 7:

INSPECTION PROCEDURE