P0327, P0328

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

A flat-type knock sensor (non-resonant type) has a structure that can detect vibrations between approximately 5 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. The occurrence of engine knocking can be suppressed by delaying the ignition timing.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0327	Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)	Output voltage of knock sensor 0.5 V or less for 1 second or more (1 trip detection logic).	Short in knock sensor circuit knock sensor ECM	Comes on	DTC stored
P0328	Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)	Output voltage of knock sensor 4.5 V or higher for 1 second or more (1 trip detection logic).	Open in knock sensor circuit knock sensor ECM	Comes on	DTC stored

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.


*a	1 V/DIV.
*b	1 ms./DIV.

Reference: Inspection using an oscilloscope

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

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 stores a DTC.

The monitor for DTCs P0327 and P0328 begins to run when 5 seconds have elapsed since the engine was started.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Turn the GTS on.
Start the engine and wait 5 minutes.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the pending DTCs.
Tech Tips
- 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.

GTS Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

Tech Tips

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, idle the engine for 5 minutes and check the DTC judgment result again.

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 and ECT / Data List / All Data / Knock Feedback Value.

Powertrain > Engine and ECT > Data List

Tester Display

Knock Feedback Value

Tester Display
Knock Feedback Value

Read the value 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 ignition switch to ON.

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
X5-2 - X5-1	Ignition switch ON	4.5 to 5.5 V

Result

Proceed to
OK
NG

NG

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

Disconnect the X5 knock sensor connector.
Disconnect the C63 ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
X5-2 - C63-122 (KNK1)	Always	Below 1 Ω
X5-1 - C63-121 (EKNK)	Always	Below 1 Ω
X5-2 or C63-122 (KNK1) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

OK

REPLACE ECM Click here

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (KNOCK SENSOR - ECM)

SFI SYSTEM, Diagnostic DTC:P0327, P0328