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

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Uz-Fe 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 (FE1 FEMALE CONNECTOR - ECM)

CHECK ECM (KNK1, KNK2 VOLTAGE)

INSPECT KNOCK SENSOR (RESISTANCE)

CHECK WIRE HARNESS (FE1 MALE 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) can detect vibration in a wide band of frequency (6 kHz to 15 kHz).
The sensor, located on the cylinder block, detects spark knock. When spark knock occurs, the knock sensor picks up vibrations in a specific frequency range. When the ECM detects signal voltage in this frequency range, it retards the ignition timing to suppress the knocking. The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults in the sensor.

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
  2. Knock sensor 1 or 2
  3. 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
  2. Knock sensor 1 or 2
  3. ECM

  1. Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)
  2. Reference: Inspection using an oscilloscope.
    The correct waveform is as shown.
    Item
    		Details
    Tester Connection
    		E7-28 (KNK1) - E7-30 (EKNK)
    or
    E7-29 (KNK2) - E-31 (EKN2)
    Equipment Settings
    		0.01 to 10 V/DIV.,
    0.01 to 10 msec./DIV.
    Condition
    		After warming up the engine,
    keep the engine speed at 4,000 rpm.

MONITOR DESCRIPTION

If the output signal remains low or high for more than 10 seconds, the ECM interprets this as a fault in the knock sensor and sets a DTC.
The monitors for DTC P0327, P0328, P0332 and P0333 run after the engine is started and 5 seconds have passed.

WIRING DIAGRAM


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


INSPECTION PROCEDURE

HINT:
  1. DTC P0327 and P0328 are for the bank 1 knock sensor circuit.
  2. DTC P0332 and P0333 are for the bank 2 knock sensor circuit.
  3. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the FE1 connector.

  1. Using lead wires, connect the FE1 terminals as follows.

    Male Connector - Female Connector
    Terminal 1 - Terminal 4
    Terminal 3 - Terminal 6
    Terminal 4 - Terminal 1
    Terminal 6 - Terminal 3

  1. Warm up the engine.

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

  1. Read output DTC.

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


B
Go to step 4
A


2.CHECK WIRE HARNESS (FE1 FEMALE CONNECTOR - ECM)
Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the FE1 connector.

  1. Disconnect the E7 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    FE1 male connector 1 - E7-28 (KNK1)
    		Below 1 Ω
    FE1 male connector 3 - E7-30 (EKNK)
    		Below 1 Ω
    FE1 male connector 4 - E7-29 (KNK2)
    		Below 1 Ω
    FE1 male connector 6 - E7-31 (EKN2)
    		Below 1 Ω
    FE1 male connector 1 or E7-28 (KNK1) - Body ground
    		10 kΩ or higher
    FE1 male connector 3 or E7-30 (EKNK) - Body ground
    		10 kΩ or higher
    FE1 male connector 4 or E7-29 (KNK2) - Body ground
    		10 kΩ or higher
    FE1 male connector 6 or E7-31 (EKN2) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.CHECK ECM (KNK1, KNK2 VOLTAGE)
Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Turn the engine switch on (IG).

  1. Measure the voltage of the ECM connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E7-28 (KNK1) - E7-30 (EKNK)
    		4.5 to 5.5 V
    E7-29 (KNK2) - E7-31 (EKN2)
    		4.5 to 5.5 V


NG
REPLACE ECM
OK

CHECK FOR INTERMITTENT PROBLEMS

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

  1. Disconnect the FE1 connector.

  1. Measure the resistance of the FE1 female connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    FE1 female connector 1 - 3
    		120 to 280 kΩ
    FE1 female connector 4 - 6
    		120 to 280 kΩ


OK
CHECK FOR INTERMITTENT PROBLEMS
NG


5.CHECK WIRE HARNESS (FE1 MALE CONNECTOR - KNOCK SENSOR)
Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the FE1 connector.

  1. Disconnect the F3 and F4 knock sensor connectors.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    FE1 female connector 1 - F3-2
    		Below 1 Ω
    FE1 female connector 3 - F3-1
    		Below 1 Ω
    FE1 female connector 4 - F4-2
    		Below 1 Ω
    FE1 female connector 6 - F4-1
    		Below 1 Ω
    FE1 female connector 1 or F3-2 - Body ground
    		10 kΩ or higher
    FE1 female connector 3 or F3-1 - Body ground
    		10 kΩ or higher
    FE1 female connector 4 or F4-2 - Body ground
    		10 kΩ or higher
    FE1 female connector 6 or F4-1 - Body ground
    		10 kΩ or higher
    HINT:
    1. If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the bank 1 side.
    2. If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the bank 2 side.


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE KNOCK SENSOR