Dtc P0327/52 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)


DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR)

CHECK ECM (KNK1 VOLTAGE)

INSPECT KNOCK SENSOR

DTC P0327/52 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

DTC P0328/52 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)


DESCRIPTION

The flat type knock sensor (non-resonant type) has a structure that can detect vibrations from about 6 to 15 kHz and has the following features:
  1. The knock sensor is fitted on the cylinder block to detect engine knocking.
  2. The sensor contains a piezoelectric element which generates voltage when it becomes deformed. This occurs when the cylinder block vibrates due to knocking. If engine knocking occurs, the ignition timing is retarded to suppress it.

    DTC No.
    		DTC Detection Condition
    		Trouble Area
    P0327/52
    		Output voltage of the knock sensor is 0.5 V or less
    1. Short in knock sensor circuit
    2. Knock sensor
    3. ECM
    P0328/52
    		Output voltage of the knock sensor is 4.5 V or more
    1. Open in knock sensor circuit
    2. Knock sensor
    3. ECM

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 monitor for DTC P0327/52 and P0328/52 runs after the engine is started and 5 seconds have passed.

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System. Dtc P0327/52 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)


INSPECTION PROCEDURE

HINT:
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.CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System. Dtc P0327/52 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the E11 ECM connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E11-29 (KNK1) - E11-30 (EKNK)
    		20°C (68°F)
    		120 to 280 kΩ


NG
Go to step 3
OK


2.CHECK ECM (KNK1 VOLTAGE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System. Dtc P0327/52 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Turn the ignition switch ON.

  1. Measure the voltage of the ECM connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E11-29 (KNK1) - E11-30 (EKNK)
    		4.5 to 5.5 V
    HINT:
    Reference: Inspect using an oscilloscope.
    Check the waveform of the ECM connector.

    OK:
    Tester Connection
    		Specified Condition
    E11-29 (KNK1) - E11-30 (EKNK)
    		Correct waveform is as shown
    Tool Setting
    		Condition
    0.01 to 10 V/Div., 0.01 to 10 msec./Div.
    		After warming up engine, keep engine speed at 4,000 rpm
    NOTICE:
    Fault may be intermittent. Check the wire harness and connectors carefully.


NG
REPLACE ECM
OK

CHECK FOR INTERMITTENT PROBLEMS

3.INSPECT KNOCK SENSOR
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System. Dtc P0327/52 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Remove the sensor.

  1. Measure the resistance of the sensor.

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


NG
REPLACE KNOCK SENSOR
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR