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

Engine. Camry. Acv40 Gsv40
2Az-Fe Engine Control System. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (KNOCK FEEDBACK VALUE)

CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR)

INSPECT ECM (KNK1 VOLTAGE)

INSPECT 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)


DESCRIPTION

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.
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
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
Camry. Acv40 Gsv40.2Az-Fe 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
Equipment Settings
1 V/DIV.
1 ms./DIV.
Conditions
Keep engine speed at 4,000 rpm with warm engine

WIRING DIAGRAM


Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)


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 and turn the tester on.

  1. Warm up the engine.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Knock Feedback Value.

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

    Standard:
    The values change.
    HINT:
    Malfunction does not occur
    		Knock Feedback Values change
    Malfunctions occur
    		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 racing the engine.


NG
Go to step 2
OK

CHECK FOR INTERMITTENT PROBLEMS

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


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the C24 ECM connector.

  1. Measure the resistance between the terminals.

    Standard resistance:
    Tester Connection
    		Specified Condition
    KNK1 (C24-110) - EKNK (C24-111)
    		120 to 280 kΩ at 20°C (68°F)

  1. Reconnect the ECM connector.



NG
Go to step 4
OK


3.INSPECT ECM (KNK1 VOLTAGE)


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the C30 knock sensor connector.

  1. Turn the ignition switch to the ON position.

  1. Measure the voltage between the knock sensor terminals.

    Standard voltage:
    Tester Connection
    		Specified Condition
    KNK1 (C30-2) - EKNK (C30-1)
    		4.5 to 5.5 V

  1. Reconnect the knock sensor connector.



NG
REPLACE ECM
OK

CHECK FOR INTERMITTENT PROBLEMS

4.INSPECT KNOCK SENSOR


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Remove the knock sensor.

  1. Measure the resistance between the terminals.

    Standard resistance:
    Tester Connection
    		Specified Condition
    KNK1 (2) - EKNK (1)
    		120 to 280 kΩ at 20°C (68°F)

  1. Reinstall the knock sensor.



NG
REPLACE KNOCK SENSOR
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR