P0328

2TR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0327: Knock Sensor 1 Circuit Low Input (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)

DESCRIPTION

A flat type knock sensor (non-resonant type) has a structure that can detect vibrations 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.

HINT: When any of DTCs 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.

- Reference: Inspection using an oscilloscope
The correct waveform is shown.

MONITOR DESCRIPTION

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 P0327 and P0328 begins to run when 5 seconds have elapsed since the engine was started.
If the malfunction is not repaired successfully, any of DTC P0327 or P0328 is set 5 seconds after the engine is next started.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

Knock Sensor Range Check (Low voltage) P0327:

Knock Sensor Range Check (High voltage) P0328:

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT: Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. 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.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR)

(a) Disconnect the E4 ECM connector.
(b) Measure the resistance between the terminals of the ECM connector.
Standard Resistance:

(c) Reconnect the ECM connector.
NG -- INSPECT KNOCK SENSOR
OK -- Continue to next step.
2. INSPECT ECM (KNK1 VOLTAGE)

(a) Disconnect the ECM connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage between the ECM terminals.
Standard Voltage:

(d) Reconnect the ECM connector.
NG -- REPLACE ECM
OK -- CHECK FOR INTERMITTENT PROBLEMS
3. INSPECT KNOCK SENSOR

(a) Remove the knock sensor.
(b) Measure the resistance between the terminals.
Standard Resistance: