DTC Code | DTC Name |
---|---|
P0327 | Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) |
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 between approximately 6 kHz and 15 kHz.
The 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.
DTC No. | DTC Detection Condition | Trouble Area |
---|---|---|
P0327 | The output voltage of the knock sensor is below 0.5 V (1 trip detection logic). |
|
P0328 | The output voltage of knock sensor is higher than 4.5 V (1 trip detection logic). |
|
Tech Tips
When DTC P0327 or P0328 is stored, 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 off.
Reference: Inspection using an oscilloscope
The correct waveform is as shown.
Item | Content |
---|---|
Terminal | KNK1 - EKNK |
Equipment Setting | 1 V/DIV. 1 ms./DIV. |
Condition | Engine speed maintained at 4000 rpm after engine warmed-up |
WIRING DIAGRAM
INSPECTION PROCEDURE
Tech Tips
Read freeze frame data using the intelligent tester. 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
READ VALUE USING INTELLIGENT TESTER (KNOCK FEEDBACK VALUE)
Connect the intelligent tester to the DLC3.
Start the engine.
Turn the tester on.
Warm up the engine.
Enter the following menus: Powertrain / Engine and ECT / Data List / Knock Feedback Value.
Read the values displayed on the tester while the vehicle is being driving.
OK |
---|
The values change. |
Tech Tips
Malfunction does not occur | Knock Feedback Values change |
Malfunction occurs | Knock Feedback Values do not change |
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) Click here |
OK |
CHECK FOR INTERMITTENT PROBLEMS Click here
INSPECT ECM (KNK1 VOLTAGE)
*1 | Front view of wire harness connector (to Knock Sensor) |
Disconnect the knock sensor connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Reconnect the knock sensor connector.
NG |
CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR) Click here |
OK |
INSPECT KNOCK SENSOR
*1 | Component without harness connected (Knock Sensor) |
*2 | Ohmmeter |
Remove the knock sensor.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Reinstall the knock sensor.
NG |
REPLACE KNOCK SENSOR Click here |
OK |
REPLACE ECM Click here
CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR)
*1 | Front view of wire harness connector (to Knock Sensor) |
*2 | Front view of wire harness connector (to ECM) |
Disconnect the knock sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open) | |||||||||
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Standard Resistance (Check for Short) | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Reconnect the knock sensor connector.
Reconnect the ECM connector.
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - KNOCK SENSOR) |
OK |
REPLACE ECM Click here