P0328
1NZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0327,P0328: Knock Sensor 1 Circuit Low 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.
A knock sensor is 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, either 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 (Low voltage) P0327::
Knock Sensor Range Check (High voltage) P0328:
Knock Sensor Range Check (High voltage) P0328::
CONFIRMATION DRIVING PATTERN
* Connect the Techstream to the DLC3.
* Turn the ignition switch to ON and turn the Techstream on.
* Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
* Turn the ignition switch off and wait for at least 30 seconds.
* Turn the ignition switch to ON and turn the Techstream on [A].
* Start the engine and wait 10 seconds.
* Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
* Read pending DTCs.
HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
* Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
* Input the DTC: P0327 or P0328.
* Check the DTC judgment result.
HINT
If the judgment result shows INCOMPLETE or UNKNOWN, idle the engine for 5 minutes and check the DTC judgment result again [C].
* If no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.
HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT
Read freeze frame data using a Techstream. Freeze frame data record 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 and turn the Techstream on.
(c) Warm up the engine.
(d) Enter the following menus: Powertrain / Engine and ECT / All Data / Knock Feedback Value.
(e) Read the values displayed on the Techstream while driving the vehicle.
OK:
The values change.
HINT
HINT:
HINT
The knock feedback value change can be confirmed by running the engine at high load, for example, by activating the air conditioning system and revving the engine.
OK -- CHECK FOR INTERMITTENT PROBLEMS
NG -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR)
(a) Disconnect the C20 ECM connector.
(b) Measure the resistance between the terminals.
Standard resistance:
(c) Reconnect the ECM connector.
NG -- INSPECT KNOCK SENSOR
OK -- Continue to next step.
3. INSPECT ECM (KNK1 VOLTAGE)
(a) Disconnect the P1 knock sensor connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage between the knock sensor terminals.
Standard voltage:
(d) Reconnect the knock sensor connector.
NOTICE:
Fault may be intermittent. Check the wire harness and connectors carefully and retest.
NG -- REPLACE ECM Removal
OK -- CHECK FOR INTERMITTENT PROBLEMS
4. INSPECT KNOCK SENSOR
(a) Remove the knock sensor.
(b) Measure the resistance between the terminals.
Standard resistance:
(c) Reinstall the knock sensor.
NG -- REPLACE KNOCK SENSOR
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - KNOCK SENSOR)