P0325

DTC P0325 KNOCK SENSOR 1 CIRCUIT (BANK 1 OR SINGLE SENSOR)
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)

CIRCUIT DESCRIPTION

DTC Detection Conditions:

A flat type knock sensor (non-resonant type) has a structure that can detect vibrations over a wide band of frequencies: between approximately 6 kHz and 15 kHz.

Knock sensors are fitted onto the engine block to detect engine knocking.

The knock sensor contains a piezoelectric element which generates a voltage when it becomes deformed.The voltage is generated when the engine block vibrates due to knocking.Any occurrence of engine knocking can be suppressed by delaying the ignition timing.

Oscilloscope Waveforms:

HINT: When any of DTCs P0325, P0327 and P0328 are set, the ECM enters fail-safe mode.During fail-safe mode, the ignition timing is delayed to its maximum retardation. Fail-safe mode continues until the ignition switch is turned to OFF.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

If the output voltage transmitted by the knock sensor remains low or high for more than 1 second, the ECM interprets this as a malfunction in the sensor circuit, and sets a DTC. The monitor for DTCs P0325, P0327 and P0328 begins to run when 5 seconds have elapsed since the engine was started.If the malfunction is not repaired successfully, either DTC P0325, P0327 or P0328 is set 5 seconds after the engine is next started.

Wiring Diagram:

Step 1:

Step 2-3:

INSPECTION PROCEDURE

HINT: Read freeze frame data using a hand-held tester or OBD II scan tool. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored.When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.