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)

for Preparation Click here


DESCRIPTION

A flat type knock sensor is used. 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.
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.
DTC Detection Condition
Trouble Area
P0327
Output voltage of knock sensor is 0.5 V or less
(1 trip detection logic)
  1. Short in knock sensor circuit
  1. Knock sensor
  1. ECM
P0328
Output voltage of knock sensor is 4.5 V or more
(1 trip detection logic)
  1. Open in knock sensor circuit
  1. Knock sensor
  1. ECM

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 off.

Reference: Inspection using an oscilloscope
A085286E42
The correct waveform is as shown.
Item
Content
Terminals
KNK1 - EKNK
Equipment Settings
1 V/DIV.
1 ms./DIV.
Conditions
Engine speed maintained at 4000 rpm after warming up engine

WIRING DIAGRAM


A134998E43


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. 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.

1.READ VALUE USING INTELLIGENT TESTER (KNOCK FEEDBACK VALUE)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine.

  1. Turn the tester on.

  1. Warm up the engine.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Knock Feedback Value.

  1. Read the values displayed on the tester while driving the vehicle.

    OK:
    The values change.

    HINT:
    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 revving the engine.



NG
Go to step 2
OK

CHECK FOR INTERMITTENT PROBLEMS (Click here)  

2.INSPECT ECM (KNK1 VOLTAGE)


    A200903E07

  1. Disconnect the knock sensor connector.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    B30-1 - B30-2
    		Ignition switch ON
    		4.5 to 5.5 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Knock Sensor)

  1. Reconnect the knock sensor connector.



NG
Go to step 4
OK


3.INSPECT KNOCK SENSOR


    A148716E18

  1. Remove the knock sensor.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		20°C (68°F)
    		120 to 280 kΩ

    Text in Illustration 
    *1
    		Component without harness connected
    (Knock Sensor)
    *2
    		Ohmmeter

  1. Reinstall the knock sensor.



NG
REPLACE KNOCK SENSOR (Click here)
OK

REPLACE ECM (Click here)  

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

  1. Disconnect the knock sensor connector,

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    B30-2 - B8-110 (KNK1)
    		Always
    		Below 1 Ω
    B30-1 - B8-111 (EKNK)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    B30-2 or B8-110 (KNK1) - Body ground
    		Always
    		10 kΩ or higher
    B30-1 or B8-111 (EKNK) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the knock sensor connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Click here)