P0328

DTC P0325 Knock Sensor 1 Circuit
DTC P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
DTC P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

DESCRIPTION

DTC Detection Condition:

A flat type knock sensor (non-resonant type) has the structure that can detect vibrations in a wider band of the frequency from about 6 kHz to 15 kHz and has the following features.

Knock sensors are fitted on the cylinder block to detect engine knocking.

The knock sensor contains a piezoelectric element which generates voltage when it becomes deformed. The generation of the voltage occurs when the cylinder block vibrates due to the knocking. If the engine knocking occurs, in order to suppress it, the ignition timing is retarded.

HINT: If the ECM detects DTC P0325,P0327 and P0328, it enters fail-safe mode in which the corrective retarded angle value is set to its maximum value.




Reference: Inspection by using an oscilloscope.

1. After warming up, run the engine at 2,500 rpm, and check and the waveform between terminals KNK1 and EKNK of the ECM connector.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

The knock sensor, located on the cylinder block, detects engine knockings. When the engine knockings occur, the sensor detects vibrations in a specific frequency range. When the ECM detects the voltage in this frequency range, it retards the ignition timing to suppress the engine knockings.

The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults in the sensor. If the knock sensor signal level is too low for more than 10 seconds, and if the knock sensor output voltage is out of the normal range, the ECM interprets this as a fault in the knock sensor and sets a DTC.

Wiring Diagram:

INSPECTION PROCEDURE

HINT: Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

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