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

Engine. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
3Zr-Fae Engine Control System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (KNOCK FEEDBACK VALUE)

INSPECT ECM (KNK1 VOLTAGE)

INSPECT KNOCK SENSOR

CHECK HARNESS AND CONNECTOR (ECM - 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 between approximately 6 kHz and 15 kHz.
The knock sensor is 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
The output voltage of the knock sensor is 0.5 V or less (1 trip detection logic).
  1. Short in knock sensor circuit
  2. Knock sensor
  3. ECM
P0328
The output voltage of the knock sensor is 4.5 V or higher (1 trip detection logic).
  1. Open in knock sensor circuit
  2. Knock sensor
  3. 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. Fail-safe mode continues until the ignition switch is turned off.
Reference: Inspection using an oscilloscope
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae 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
Terminal
KNK1 - EKNK
Equipment Setting
1 V/DIV.
1 ms./DIV.
Condition
Keep engine speed at 4000 rpm with warm engine

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae 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. Enter the following menus: Powertrain / Engine and ECT / Data List / Knock Feedback Value.

  1. Read the values displayed on the tester while the vehicle is being driven.

    OK:
    The values change.

    HINT:

    Malfunction does not occur
    		Knock Feedback Value changes
    Malfunction occurs
    		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

CHECK FOR INTERMITTENT PROBLEMS (RAV4_ACA30 RM000000PDQ0T1X.html)

2.INSPECT ECM (KNK1 VOLTAGE)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the knock sensor connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    j1-2 - j1-1
    		Ignition switch ON
    		4.5 to 5.5 V
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Knock Sensor)

  1. Reconnect the knock sensor connector.



NG
Go to step 4
OK


3.INSPECT KNOCK SENSOR


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae 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 according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2 (KNK1) - 1 (EKNK)
    		20°C (68°F)
    		120 to 280 kΩ
    Text in Illustration
    *1
    		Component without harness connected
    (Knock Sensor)
    *2
    		Ohmmeter
    *3
    		Knock Sensor

  1. Reinstall the knock sensor.



NG
REPLACE KNOCK SENSOR (RAV4_ACA30 RM000002WSR00TX.html)
OK

REPLACE ECM (RAV4_ACA30 RM0000017UO01KX.html)

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

  1. Disconnect the knock sensor connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    j1-2 - B32-110 (KNK1)
    		Always
    		Below 1 Ω
    j1-1 - B32-111 (EKNK)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    j1-2 or B32-110 (KNK1) - Body ground
    		Always
    		10 kΩ or higher
    j1-1 or B32-111 (EKNK) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the knock sensor connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - KNOCK SENSOR)
OK

REPLACE ECM (RAV4_ACA30 RM0000017UO01KX.html)