Circuit Description

Knock sensor is fitted on the cylinder block to detect the 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, the ignition timing is delayed to suppress it.

DTC P0325

DTC No.	DTC Detecting Condition	Trouble Area
P0325	Knock Sensor Signal Level Remain Low More Than 10 Seconds	Open Or Short In Knock Sensor Circuit Knock Sensor (Under-Torqued Or Loose) ECM

NOTE: If the ECM detects the DTC "P0325", it enters the fail-safe mode in which the corrective retarded angle value is set to the maximum value.

Reference: Inspection using the oscilloscope.

NOTE: The correct waveform is as shown on the left.

DTC P0325

Item	Details
Terminal	KNK1 - E1
Equipment Settings	0.01 to 10 V/Division, 0.01 to 10 msec./Division
Condition	After Warming Up The Engine, Keep The Engine Speed At 4,000 RPM.

Fig 1: Waveform Graph