P0328

2ZR-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

Flat type knock sensors (non-resonant type) have structures 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.





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 as 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, 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 a 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. READ VALUE USING TECHSTREAM (KNOCK FEEDBACK VALUE)
(a) Connect a Techstream to the DLC3.
(b) Start the engine.
(c) Turn the tester ON.
(d) Warm up the engine.
(e) Select the following menu items: Powertrain / Engine and ECT / All Data / Knock Feedback Value.
(f) Read the value while driving the vehicle.
OK:
The value changes.





HINT: The knock feedback value change can be confirmed by running the engine with a high load, for example, by activating the air conditioning system and racing the engine.

NG -- INSPECT ECM (KNK1 VOLTAGE)
OK -- CHECK FOR INTERMITTENT PROBLEMS
2. INSPECT ECM (KNK1 VOLTAGE)





(a) Disconnect the knock sensor connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:





(d) Reconnect the knock sensor connector.
NG -- CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR)
OK -- Continue to next step.
3. INSPECT KNOCK SENSOR





(a) Remove the knock sensor.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Reinstall the knock sensor.
NG -- REPLACE KNOCK SENSOR
OK -- REPLACE ECM
4. CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR)





(a) Disconnect the knock sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):






Standard resistance (Check for short):





(d) Reconnect the knock sensor connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM