P0330
DTC PO325 Knock Sensor 1 Circuit MalfunctionDTC PO330 Knock Sensor 2 Circuit Malfunction
CIRCUIT DESCRIPTION
Knock sensors are fitted one each to the right bank and left bank of the cylinder block to detect engine knocking. This sensor contains a piezoelectric element which generates a voltage when it becomes deformed, which occurs when the cylinder block vibrates due to knocking. If engine knocking occurs, ignition timing is retarded to suppress it.
DETECTING CONDITION
If the ECM detects the above diagnosis conditions, it operates the fail safe function in which the correct retard angle value is set to the maximum value.
WIRING DIAGRAM
Knock Sensors Circuit:
INSPECTION PROCEDURE
HINTS:
- DTC PO325 is for right bank knock sensor circuit.
- DTC PO33O is for left bank knock sensor circuit.
INSPECTION USING OSCILLOSCOPE
Knock Sensor Waveform:
