СИСТЕМА SFI, Diagnostic DTC:P0327, P0328

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)

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).

  • Short in knock sensor circuit

  • Knock sensor

  • ECM
P0328 The output voltage of the knock sensor is 4.5 V or higher (1 trip detection logic).

  • Open in knock sensor circuit

  • Knock sensor

  • ECM

Tech Tips

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 engine switch is turned off.

Reference: Inspection using an oscilloscope

A005TDNE04

The correct waveform is as shown.

Item Content
Terminal KNK1 - EKNK
Equipment Setting

1 V/DIV.

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

WIRING DIAGRAM

A005RFTE01

INSPECTION PROCEDURE

Tech Tips

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, and other data from the time the malfunction occurred.

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER (KNOCK FEEDBACK VALUE)

    1. Connect the intelligent tester to the DLC3.

    2. Start the engine and turn the tester on.

    3. Warm up the engine.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Knock Feedback Value.

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

      Standard
      The value changes.

      Tech Tips

      Malfunction does not occur Knock Feedback Value changes
      Malfunctions occur Knock Feedback Value does not change

      The Knock Feedback Value change can be confirmed by running the engine at high load, for example, by activating the air conditioning system and racing the engine.

    NG

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

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

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

    A005RL8E92

    1. Disconnect the B39 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B39-110 (KNK1) - B39-111 (EKNK) 20°C (68°F) 120 to 280 kΩ
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

    3. Reconnect the ECM connector.

    NG

    INSPECT KNOCK SENSOR Click here

    OK

  3. INSPECT ECM (KNK1 VOLTAGE)

    A005SV8E10

    1. Disconnect the B46 knock sensor connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B46-2 (KNK1) - B46-1 (EKNK) Engine switch on (IG) 4.5 to 5.5 V
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Knock Sensor)

    4. Reconnect the knock sensor connector.

    NG

    REPLACE ECM Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  4. INSPECT KNOCK SENSOR

    A005SEFE02

    1. Remove the knock sensor.

    2. 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

    3. Reinstall the knock sensor.

    NG

    REPLACE KNOCK SENSOR Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR