P0300

DTC PO3OO - Random Misfire Detected
DTC PO3O1 - Cylinder 1 Misfire Detected
DTC PO3O2 - Cylinder 2 Misfire Detected
DTC PO3O3 - Cylinder 3 Misfire Detected
DTC PO3O4 - Cylinder 4 Misfire Detected
DTC PO3O5 - Cylinder 5 Misfire Detected
DTC PO3O6 - Cylinder 6 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

Fuel Injectors Driver Circuit:

INSPECTION USING OSCILLOSCOPE






Injector Signal Waveform
- With the engine idling, measure between terminals #10 - #60 and EO1 of ECM.
HINT: The correct waveform is as shown.

INSPECTION PROCEDURE