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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

A flat type knock control sensor (non-resonant type) has a structure that can detect vibration between approximately 6 kHz and 15 kHz.

Knock control sensors are fitted onto the engine block to detect engine knocking.

The knock control 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 control sensor is 0.5 V or less

(1 trip detection logic)

  • Short in knock control sensor circuit

  • Knock control sensor

  • ECM
P0328

Output voltage of knock control sensor is 4.5 V or more

(1 trip detection logic)

  • Open in knock control sensor circuit

  • Knock control sensor

  • ECM
Tip:

When any of DTCs P0327 and 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 engine switch is turned off.

Reference: Inspection using an oscilloscope

The correct waveform is as shown in the illustration.

Item Content
ECM Terminal Name Between KNK1 and EKNK
Tester Range 1 V/DIV., 1 ms./DIV.
Condition Engine speed maintained at 4000 rpm after warming up 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


  1. Click here

    INSPECT ECM (KNK1 VOLTAGE)


    1. A01CBQLE25

      Disconnect the knock control 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
      D61-1 - D61-2 Engine switch on (IG) 4.5 to 5.5 V
      Table 1. Text in Illustration
      *1

      Front view of wire harness connector

      (to Knock Control Sensor)

    4. Reconnect the knock control sensor connector.


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    INSPECT KNOCK CONTROL SENSOR


    1. A01CBKXE21

      Remove the knock control sensor.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 120 to 280 kΩ
      Table 2. Text in Illustration
      *1

      Component without harness connected

      (Knock Control Sensor)
      *2 Ohmmeter

    3. Reinstall the knock control sensor.


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    CHECK HARNESS AND CONNECTOR (KNOCK CONTROL SENSOR - ECM)


    1. Disconnect the knock control 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
      D61-2 - D41-110 (KNK1) Always Below 1 Ω
      D61-1 - D41-111 (EKNK) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D61-2 or D41-110 (KNK1) - Body ground Always 10 kΩ or higher
      D61-1 or D41-111 (EKNK) - Body ground Always 10 kΩ or higher

    4. Reconnect the knock control sensor connector.

    5. Reconnect the ECM connector.


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    REPLACE KNOCK CONTROL SENSORClick here

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    REPLACE ECMClick here

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