P0327, P0328

DTC Code	DTC Name
P0327	Knock Sensor 1 Circuit Low Bank 1 or Single Sensor
P0328	Knock Sensor 1 Circuit High Bank 1 or Single Sensor

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0327	Knock Sensor 1 Circuit Low Bank 1 or Single Sensor	DTC Detection Condition Enable Criteria Engine running Malfunction Criteria This code is set when the bank 1 knock sensor signal is less than 0.587 V Diagnostic Mask The MIL will be illuminated if a fault is present for two consecutive trips Monitor Continuous Potential failure modes Abnormal engine noise, i.e. damaged engine or exhaust system contacting vehicle Knock sensor fixing too tight Sensor connector / wiring corroded or loose connections ECU	Short in knock sensor circuit Wire harness or connector Knock sensor ECM	Comes on	DTC stored
P0328	Knock Sensor 1 Circuit High Bank 1 or Single Sensor	DTC Detection Condition Enable Criteria Engine running Malfunction Criteria This code is set when the bank 1 knock sensor signal is 2.933 V or higher Diagnostic Mask The MIL will be illuminated if a fault is present for two consecutive trips Monitor Continuous Potential failure modes Abnormal engine noise, i.e. damaged engine or exhaust system contacting vehicle Knock sensor fixing too tight Sensor connector / wiring corroded or loose connections ECU	Open in knock sensor circuit Wire harness or connector Knock sensor ECM	Comes on	DTC stored

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0327

Knock Sensor 1 Circuit Low Bank 1 or Single Sensor

DTC Detection Condition

Enable Criteria

Engine running

Malfunction Criteria

This code is set when the bank 1 knock sensor signal is less than 0.587 V

Diagnostic Mask

The MIL will be illuminated if a fault is present for two consecutive trips

Monitor

Continuous

Potential failure modes

Abnormal engine noise, i.e. damaged engine or exhaust system contacting vehicle
Knock sensor fixing too tight
Sensor connector / wiring corroded or loose connections
ECU

Short in knock sensor circuit
Wire harness or connector
Knock sensor
ECM

Comes on

DTC stored

P0328

Knock Sensor 1 Circuit High Bank 1 or Single Sensor

DTC Detection Condition

Enable Criteria

Engine running

Malfunction Criteria

This code is set when the bank 1 knock sensor signal is 2.933 V or higher

Diagnostic Mask

The MIL will be illuminated if a fault is present for two consecutive trips

Monitor

Continuous

Potential failure modes

Abnormal engine noise, i.e. damaged engine or exhaust system contacting vehicle
Knock sensor fixing too tight
Sensor connector / wiring corroded or loose connections
ECU

Open in knock sensor circuit
Wire harness or connector
Knock sensor
ECM

Comes on

DTC stored

Reference: Inspection using an oscilloscope

Tech Tips

The correct waveform is as shown.

ECM Terminal Name	Between KNK1 and EKNK
Tester Range	1 V/DIV., 1 ms./DIV.
Condition	Engine speed maintained at 4000 rpm after warming up engine

MONITOR DESCRIPTION

The knock sensor contains a piezoelectric element which generates a voltage when it becomes deformed. The piezoelectric element sends continuously sends a signal to the ECU, when the cylinder block vibrates due to engine knocking this signal increases. The ECU is able to identify each cylinder. If knock is detected then the ECU will retard the ignition of the relevant cylinder to suppress it.The knock control sensor cannot differentiate between spark knock and other similar sounding noises.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. 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.

PROCEDURE

READ VALUE USING GTS (KNOCK FEEDBACK VALUE)

Connect the GTS to the DLC3.
Start the engine.
Turn the GTS on.
Warm up the engine.
Enter the following menus: Powertrain / Engine / Data List / Knock Feedback Value.

Read the values displayed on the GTS while driving the vehicle.

OK
The value changes.

Tech Tips

Malfunction does not occur	Knock Feedback Value changes
Malfunctions occur	Knock Feedback Value does 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.

Result

Proceed to
OK
NG

OK

CHECK FOR INTERMITTENT PROBLEMS Click here

NG

CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK SENSOR)

*a	Front view of wire harness connector (to Knock Sensor)

Disconnect the knock sensor connector.
Turn the engine switch on (IG).

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
E4-2 - E4-1	Engine switch on (IG)	4.5 to 5.5 V

Result

Proceed to
OK
NG

NG

CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR) Click here

OK

INSPECT KNOCK SENSOR

Inspect the knock sensor.

Click here

Tech Tips

Perform "Inspection After Repair" after replacing the knock sensor.

Click here

Result

Proceed to
OK
NG

OK

REPLACE ECM Click here

NG

REPLACE KNOCK SENSOR Click here

CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR)

Disconnect the B142 ECM connector.
Disconnect the E4 knock sensor connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
B142-40 (ENK1) - E4-1	Always	Below 1 Ω
B142-39 (EKNK) - E4-2	Always	Below 1 Ω
B142-40 (ENK1) or E4-1 - Body ground and other terminals	Always	10 kΩ or higher
B142-39 (EKNK) or E4-2 - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

OK

REPLACE ECM Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

SFI SYSTEM, Diagnostic DTC:P0327, P0328