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

Flat-type knock sensors (non-resonant type) have structures that can detect vibrations between approximately 6 kHz and 15 kHz.

A 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

P0332

 The output voltage of the knock sensor is below 0.5 V (1 trip detection logic).

  • Short in knock sensor circuit

  • Knock sensor

  • ECM

P0328

P0333

 The output voltage of the knock sensor is higher than 4.5 V (1 trip detection logic).

  • Open in knock sensor circuit

  • Knock sensor

  • ECM

Tech Tips

When DTC P0327, P0328, P0332 or P0333 is stored, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is delayed to its maximum retardation. The ECM continues fail-safe mode until the ignition switch is turned off.

Reference: Inspection using an oscilloscope

A00O6E5E01

The correct waveform is as shown.

Item Content
Terminal

KNK1 - EKNK

KNK2 - EKN2
Equipment Setting

1 V/DIV.

1 msec./DIV.
Condition Engine speed maintained at 4000 rpm with warm engine

MONITOR DESCRIPTION

If the output voltage transmitted by the knock sensor remains low or high for more than 1 second, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.

The monitor for DTCs P0327, P0328, P0332 and P0333 begins to run when 5 seconds have elapsed since the engine was started.

If the malfunction is not repaired successfully, DTC P0327, P0328, P0332 or P0333 is stored 5 seconds after the engine is next started.

WIRING DIAGRAM

A00O8XEE06

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.

  • Read freeze frame data using the intelligent tester. 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.

PROCEDURE


  1. READ DTC OUTPUT (CHECK KNOCK SENSOR CIRCUIT)

    A00O7UDE05
    Text in Illustration
    *1 Knock Sensor
    *2 ECM
    *a

    Front view of wire harness connector

    (to Knock Sensor Wire)
    *b

    Front view of wire harness connector

    (to ECM Wire)

    1. Disconnect the Ch1 connector.

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

      Male Connector - Female Connector
      Terminal 2 - Terminal 4
      Terminal 5 - Terminal 6
      Terminal 4 - Terminal 2
      Terminal 6 - Terminal 5

    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 tester on.

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

    8. Read the DTCs.

      Result
      Result Proceed to

      DTC is same as when vehicle was brought in

      (for example, P0327 and P0328 are output again, or P0332 and P0333 are output again)

      		 A

      DTC is different from when vehicle was brought in

      (for example, P0327 and P0328 are output at first, but then P0332 and P0333 are output, or vice versa)

      		 B

    9. Reconnect the Ch1 connector.


    B

    INSPECT KNOCK SENSOR Click here

    A

  2. CHECK HARNESS AND CONNECTOR (CONNECTOR - ECM)


    1. Disconnect the Ch1 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
      Ch1 female connector 2 - C35-11 (KNK1) Always Below 1 Ω
      Ch1 female connector 5 - C35-12 (EKNK) Always Below 1 Ω
      Ch1 female connector 4 - C35-5 (KNK2) Always Below 1 Ω
      Ch1 female connector 6 - C35-6 (EKN2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      Ch1 female connector 2 or C35-11 (KNK1) - Body ground Always 10 kΩ or higher
      Ch1 female connector 5 or C35-12 (EKNK) - Body ground Always 10 kΩ or higher
      Ch1 female connector 4 or C35-5 (KNK2) - Body ground Always 10 kΩ or higher
      Ch1 female connector 6 or C35-6 (EKN2) - Body ground Always 10 kΩ or higher

    4. Reconnect the Ch1 connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ECM (VOLTAGE)

    A00O8C7E18
    Text in Illustration
    *a

    Front view of wire harness connector

    (to ECM Wire)

    1. Disconnect the Ch1 connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Ch1 female connector 2 - 5 Ignition switch ON 4.5 to 5.5 V
      Ch1 female connector 4 - 6 Ignition switch ON 4.5 to 5.5 V

    3. Reconnect the Ch1 connector.


    NG

    REPLACE ECM Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  4. INSPECT KNOCK SENSOR

    A00O47UE33
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Knock Sensor Wire)

    1. Disconnect the Ch1 connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Ch1 male connector 2 - 5 20°C (68°F) 120 to 280 kΩ
      Ch1 male connector 4 - 6 20°C (68°F) 120 to 280 kΩ

    3. Reconnect the Ch1 connector.


    NG

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

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

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

    Tech Tips


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

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


    1. Disconnect the Ch1 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
      Ch1 male connector 2 - h2-2 Always Below 1 Ω
      Ch1 male connector 5 - h2-1 Always Below 1 Ω
      Ch1 male connector 4 - h1-2 Always Below 1 Ω
      Ch1 male connector 6 - h1-1 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      Ch1 male connector 2 or h2-2 - Body ground Always 10 kΩ or higher
      Ch1 male connector 5 or h2-1 - Body ground Always 10 kΩ or higher
      Ch1 male connector 4 or h1-2 - Body ground Always 10 kΩ or higher
      Ch1 male connector 6 or h1-1 - Body ground Always 10 kΩ or higher

    4. Reconnect the Ch1 connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE KNOCK SENSOR Click here