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SFI SYSTEM, Diagnostic DTC:P0327, P0328

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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)
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DESCRIPTION

Flat type knock sensors (non-resonant type) have structures that can detect vibrations between approximately 5 kHz and 15 kHz.

The 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)

  • Short in knock sensor circuit


  • Knock sensor


  • ECM
P0328

Output voltage of knock sensor is 4.5 V or more

(1 trip detection logic)

  • Open in knock sensor circuit


  • Knock sensor


  • ECM
Tip:

When any of DTCs P0327 or 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

The correct waveform is as shown.

Item Content
Terminals KNK1 - EKNK
Equipment Settings

1 V/DIV.

1 ms./DIV.
Conditions Keep engine speed at 4000 rpm with warm engine
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

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.

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PROCEDURE


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    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 driving the vehicle.

      OK
      The values change.
      Tip:
      Malfunction does not occur Knock Feedback Values change
      Malfunction occurs 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.


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    INSPECT ECM (KNK1 VOLTAGE)


    1. A01IQEPE13

      Disconnect the knock sensor connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F1-2 (KNK1) - F1-1 (E) Ignition switch ON 4.5 to 5.5 V
      Table 1. Text in Illustration
      *1

      Front view of wire harness connector

      (to Knock Sensor)

    4. Reconnect the knock sensor connector.


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    INSPECT KNOCK SENSOR


    1. A01IT5FE01

      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 (E) 20°C (68°F) 120 to 280 kΩ
      Table 2. Text in Illustration
      *1

      Component without harness connected

      (Knock Sensor)
      *2 Ohmmeter
      *3 Knock Sensor

    3. Reinstall the knock sensor.


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    CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR)


    1. Disconnect the knock sensor 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
      F1-2 (KNK1) - C68-110 (KNK1) Always Below 1 Ω
      F1-1 (E) - C68-111 (EKNK) Always Below 1 Ω
      Standard Resistance (Check for short)
      Tester Connection Condition Specified Condition
      F1-2 (KNK1) or C68-110 (KNK1) - Body ground Always 10 kΩ or higher
      F1-1 (E) or C68-111 (EKNK) - Body ground Always 10 kΩ or higher

    4. Reconnect the knock sensor connector.

    5. Reconnect the ECM connector.


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    CHECK FOR INTERMITTENT PROBLEMSClick here

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    REPLACE ECMClick here

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

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    REPLACE KNOCK SENSORClick here