Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Gr-Fse Engine Control System. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT)

CHECK WIRE HARNESS AND CONNECTOR (CONNECTOR - ECM)

INSPECT ECM

INSPECT KNOCK SENSOR

CHECK HARNESS AND CONNECTOR (CONNECTOR - KNOCK SENSOR)

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)

DTC P0332 Knock Sensor 2 Circuit Low Input (Bank 2)

DTC P0333 Knock Sensor 2 Circuit High Input (Bank 2)


DESCRIPTION

A flat type knock sensor (non-resonant type) has a structure that can detect vibrations over a wide band of frequencies: between approximately 6 kHz and 15 kHz.
Knock sensors are 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
P0332
Output voltage of knock sensor 1 or 2 is 0.5 V or less
(1 trip detection logic)
  1. Short in knock sensor 1 or 2 circuit
  1. Knock sensor 1 or 2
  1. ECM
P0328
P0333
Output voltage of knock sensor 1 or 2 is 4.5 V or more
(1 trip detection logic)
  1. Open in knock sensor 1 or 2 circuit
  1. Knock sensor 1 or 2
  1. ECM
HINT:
When any of DTCs P0327, P0328, P0332 and P0333 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 engine switch is turned to OFF.
Reference: Inspection using an oscilloscope
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)
The correct waveform is as shown.
Item
Content
Terminals
KNK1 - EKNK
or
KNK2 -EKN2
Equipment Settings
0.01 to 10 V/DIV.,
0.01 to 10 msec./DIV.
Conditions
Keep engine speed at 4,000 rpm with warm engine

MONITOR DESCRIPTION

The knock sensor, located on the cylinder block, detects spark knock. When spark knock occurs, the piezoelectric element of the sensor vibrates. When the ECM detects a voltage in this frequency range, it retards the ignition timing to suppress the spark knock.
The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults in the sensor. If the knock sensor signal level is too low for more than 10 seconds, or if the knock sensor output voltage is outside the normal range, the ECM interprets this as a fault in the knock sensor and sets a DTC.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)


INSPECTION PROCEDURE

HINT:
  1. DTCs P0327 and P0328 are for the bank 1 knock sensor circuit.
  1. DTCs P0332 and P0333 are for the bank 2 knock sensor circuit.
  1. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions 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.
1.READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the EH1 connector.

  1. Using lead wires, connect the connectors as follows.

    Male Connector - Female Connector
    Terminal 4 - Terminal 1
    Terminal 5 - Terminal 2
    Terminal 1 - Terminal 4
    Terminal 2 - Terminal 5

  1. Warm up the engine.

  1. Run the engine at 3,000 rpm for 10 seconds or more.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and turn the intelligent tester ON.

  1. Enter the following menus: Power train / Engine / DTC.

  1. Read DTCs.

    Result:
    Display
    		Proceed to
    DTCs same as when vehicle brought in P0327, P0328 → P0327, P0328 or P0332, P0333 → P0332, P0333
    		A
    DTCs different from when vehicle brought in P0327, P0328 → P0332, P0333 or P0332, P0333 → P0327, P0328
    		B

  1. Reconnect the EH1 connector.



B
Go to step 4
A


2.CHECK WIRE HARNESS AND CONNECTOR (CONNECTOR - ECM)


    Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the EH1 connector.

  1. Disconnect the E7 ECM connector.

  1. Measure the resistance.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    EH1 female connector 4 - KNK1 (E7-28)
    		Below 1 Ω
    EH1 female connector 5 - EKNK (E7-30)
    		Below 1 Ω
    EH1 female connector 1 - KNK2 (E7-29)
    		Below 1 Ω
    EH1 female connector 2 - EKN2 (E7-31)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    EH1 female connector 4 or KNK1 (E7-28) - Body ground
    		10 kΩ or higher
    EH1 female connector 5 or EKNK (E7-30) - Body ground
    		10 kΩ or higher
    EH1 female connector 1 or KNK2 (E7-29) - Body ground
    		10 kΩ or higher
    EH1 female connector 2 or EKN2 (E7-31) - Body ground
    		10 kΩ or higher

  1. Reconnect the EH1 connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.INSPECT ECM
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the EH1 connector.

  1. Turn the engine switch on (IG).

  1. Measure the voltage between the EH1 terminals.

    Standard voltage:
    Tester Connection
    		Specified Condition
    EH1 female connector 4 - 5
    		4.5 to 5.5 V
    EH1 female connector 1 - 2
    		4.5 to 5.5 V

  1. Reconnect the ECM connector.



NG
REPLACE ECM
OK

CHECK FOR INTERMITTENT PROBLEMS

4.INSPECT KNOCK SENSOR
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the EH1 connector.

  1. Measure the resistance between the terminals of the EH1 male connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    EH1 male connector 4 - 5
    		120 to 280 kΩ
    EH1 male connector 1 - 2
    		120 to 280 kΩ

  1. Reconnect the EH1 connector.



OK
CHECK FOR INTERMITTENT PROBLEMS
NG


5.CHECK HARNESS AND CONNECTOR (CONNECTOR - KNOCK SENSOR)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)
HINT:
  1. If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the right bank side.
  1. If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the left bank side.

  1. Disconnect the EH1 connector.

  1. Disconnect the H1 and H2 knock sensor connectors.

  1. Measure the resistance.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    EH1 male connector 4 - H1-2
    		Below 1 Ω
    EH1 male connector 5 - H1-1
    		Below 1 Ω
    EH1 male connector 1 - H2-2
    		Below 1 Ω
    EH1 male connector 2 - H2-1
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    EH1 male connector 4 or H1-2 - Body ground
    		10 kΩ or higher
    EH1 male connector 5 or H1-1 - Body ground
    		10 kΩ or higher
    EH1 male connector 1 or H2-2 - Body ground
    		10 kΩ or higher
    EH1 male connector 2 or H2-1 - Body ground
    		10 kΩ or higher

  1. Reconnect the EH1 connector.

  1. Reconnect the knock sensor connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE KNOCK SENSOR