SFI SYSTEM, Diagnostic DTC:P0327, P0328, P0332, P0333

DTC Code DTC Name
P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
P0333 Knock Sensor 2 Circuit High Input (Bank 2)

DESCRIPTION

A flat type knock sensor (non-resonant type) has a structure 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 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

P0332

 Output voltage of knock sensor (bank 1, 2) is less than 0.5 V (1 trip detection logic)

  • Short in knock sensor (bank 1, 2) circuit

  • Knock sensor (bank 1, 2)

  • ECM

P0328

P0333

 Output voltage of knock sensor (bank 1, 2) is more than 4.5 V (1 trip detection logic)

  • Open in knock sensor (bank 1, 2) circuit

  • Knock sensor (bank 1, 2)

  • ECM

Tech Tips

When any of DTCs P0327, P0328, P0332 and P0333 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

A017DNPE01

The correct waveform is as shown.

Item Content
Terminals KNK1 - EKNK or KNK2 - EKN2
Equipment Settings 0.01 to 10 V/DIV., 0.01 to 10 ms./DIV.
Conditions With engine speed at 4000 rpm after warming up

WIRING DIAGRAM

A017CUHE10

INSPECTION PROCEDURE

Tech Tips


  • DTCs P0327 and P0328 are for the bank 1 knock sensor circuit.

  • DTCs P0332 and P0333 are for the bank 2 knock sensor circuit.

  • Bank 1 refers to the bank that includes the No. 1 cylinder*.

    *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

  • Bank 2 refers to the bank that does not include the No. 1 cylinder.

  • 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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. READ VALUE USING DTC OUTPUT (CHECK KNOCK SENSOR CIRCUIT)


    1. A017CUGE05
      Text in Illustration
      *1 Knock Sensor
      *2 ECM
      *3 Male Connector
      *4 Female Connector
      *a

      Front view of wire harness connector

      (to Knock Sensor)

      Disconnect the Bd1 connector.

    2. Using lead wires, connect the connectors as follows.

      Male Connector - Female Connector
      Terminal 2 - Terminal 4
      Terminal 1 - Terminal 3
      Terminal 4 - Terminal 2
      Terminal 3 - Terminal 1

    3. Warm up the engine.

    4. Run the engine at 3000 rpm for 10 seconds or more.

    5. Connect the intelligent tester to the DLC3.

    6. Turn the ignition switch on (IG) and turn the tester on.

    7. Enter the following menus: Powertrain / Engine and ECT / DTC.

    8. Read the DTCs.

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

    9. Reconnect the Bd1 connector.


    B

    INSPECT KNOCK SENSOR Click here

    A

  2. CHECK HARNESS OR CONNECTOR (Bd1 CONNECTOR - ECM)


    1. Disconnect the Bd1 connector.

    2. Disconnect the ECM connector.

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

      Standard resistance
      Check for open
      Tester Connection Condition Specified Condition
      Bd1 female connector 2 - B49-11 (KNK1) Always Below 1 Ω
      Bd1 female connector 1 - B49-12 (EKNK) Always Below 1 Ω
      Bd1 female connector 4 - B49-5 (KNK2) Always Below 1 Ω
      Bd1 female connector 3 - B49-6 (EKN2) Always Below 1 Ω
      Check for short
      Tester Connection Condition Specified Condition
      Bd1 female connector 2 or B49-11 (KNK1) - Body ground Always 10 kΩ or higher
      Bd1 female connector 1 or B49-12 (EKNK) - Body ground Always 10 kΩ or higher
      Bd1 female connector 4 or B49-5 (KNK2) - Body ground Always 10 kΩ or higher
      Bd1 female connector 3 or B49-6 (EKN2) - Body ground Always 10 kΩ or higher

    4. Reconnect the Bd1 connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (Bd1 CONNECTOR - ECM)

    OK

  3. INSPECT ECM


    1. A017C9IE20
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to ECM)

      Turn the ignition switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      B49-11 (KNK1) - B49-12 (EKNK) Ignition switch on (IG) 2 to 3 V
      B49-5 (KNK2) - B49-6 (EKN2) Ignition switch on (IG) 2 to 3 V

    3. Reconnect the ECM connector.

      Note

      Fault may be intermittent. Check the wire harness and connectors carefully and retest.


    NG

    REPLACE ECM Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  4. INSPECT KNOCK SENSOR


    1. A017DXVE04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Male Connector)

      Disconnect the Bd1 connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      Bd1 male connector 1 - 2 20°C 120 to 280 kΩ
      Bd1 male connector 3 - 4 20°C 120 to 280 kΩ

    3. Reconnect the Bd1 connector.


    NG

    CHECK HARNESS AND CONNECTOR (Bd1 CONNECTOR - KNOCK SENSOR) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  5. CHECK HARNESS AND CONNECTOR (Bd1 CONNECTOR - KNOCK SENSOR)

    Tech Tips


    • If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the right bank side.

    • If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the left bank side.


    1. Disconnect the Bd1 connector.

    2. Disconnect the knock sensor connectors.

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

      Standard resistance
      Check for open
      Tester Connection Condition Specified Condition
      Bd1 male connector 2 - d2-2 Always Below 1 Ω
      Bd1 male connector 1 - d2-1 Always Below 1 Ω
      Bd1 male connector 4 - d1-2 Always Below 1 Ω
      Bd1 male connector 3 - d1-1 Always Below 1 Ω
      Check for short
      Tester Connection Condition Specified Condition
      Bd1 male connector 2 or d2-2 - Body ground Always 10 kΩ or higher
      Bd1 male connector 1 or d2-1 - Body ground Always 10 kΩ or higher
      Bd1 male connector 4 or d1-2 - Body ground Always 10 kΩ or higher
      Bd1 male connector 3 or d1-1 - Body ground Always 10 kΩ or higher

    4. Reconnect the Bd1 connector.

    5. Reconnect the knock sensor connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (Bd1 CONNECTOR - KNOCK SENSOR)

    OK

    REPLACE KNOCK SENSOR Click here