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


DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING KNOCK SENSOR (KNOCK FEEDBACK VALUE)

CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK CONTROL SENSOR)

INSPECT KNOCK CONTROL SENSOR

CHECK HARNESS AND CONNECTOR

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)


DESCRIPTION

A flat-type knock sensor (non-resonant type) has a structure that can detect vibrations between approximately 5 kHz and 15 kHz.
Knock sensors are fitted onto the engine block to detect engine knocking.
Each 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
Output voltage of the 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 the knock sensor is 4.5 V or higher (1 trip detection logic).
  1. Open in knock sensor circuit
  1. Knock sensor
  1. ECM
HINT:
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. The ECM continues operating in fail-safe mode until the ignition switch is turned off.
Reference: Inspection using an oscilloscope
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

Tester Connection
Tool Setting
Condition
Specified Condition
C154-20 (KNK1) - C154-28 (EKNK)
1 V/DIV.
1 msec./DIV.
Engine speed at 4000 rpm with warm engine
The correct waveform is as shown

MONITOR DESCRIPTION

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 output voltage is outside the normal range, the ECM interprets this as a fault in the knock sensor and stores a DTC.

MONITOR STRATEGY


Frequency of Operation
Continuous

CONFIRMATION DRIVING PATTERN

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the GTS on.
  6. Start the engine and wait 5 minutes.
  7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
  8. Read the pending DTCs.
    HINT:
    1. If a pending DTC is output, the system is malfunctioning.
    2. If a pending DTC is not output, perform the following procedure.
  9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  10. Input the DTC: P0327 or P0328.
  11. Check the DTC judgment result.

    GTS Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    N/A
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    HINT:
    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
    3. If the judgment result shows INCOMPLETE or N/A, idle the engine for 5 minutes and check the DTC judgment result again.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the GTS. Freeze frame data records the engine condition 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 VALUE USING KNOCK SENSOR (KNOCK FEEDBACK VALUE)

  1. Connect the GTS to the DLC3.

  1. Start the engine.

  1. Turn the GTS on.

  1. Warm up the engine.

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

  1. Read the value while driving the vehicle.

    OK:
    The value changes.

    HINT:

    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.


NG
Go to step 2
OK


2.CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK CONTROL SENSOR)
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the knock control 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
    h3-2 - h3-1
    		Ignition switch ON
    		4.5 to 5.5 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Knock Control Sensor)


NG
Go to step 4
OK


3.INSPECT KNOCK CONTROL SENSOR

  1. Inspect the knock control sensor (LandCruiser RM000000VWF02DX.html).

HINT:
Perform "Inspection After Repair" after replacing the knock control sensor (LandCruiser RM000004NJC03XX.html).


NG
REPLACE KNOCK CONTROL SENSOR (LandCruiser RM000000VWH039X.html)
OK

REPLACE ECM (LandCruiser RM000000VW203EX.html)

4.CHECK HARNESS AND CONNECTOR

  1. Disconnect the knock control sensor connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    h3-2 - C154-20 (KNK1)
    		Always
    		Below 1 Ω
    h3-1 - C154-28 (EKNK)
    		Always
    		Below 1 Ω
    h3-2 or C154-20 (KNK1) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (LandCruiser RM000000VW203EX.html)