SFI SYSTEM(except K111, K111F), 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

A flat-type knock sensor (non-resonant type) has a structure that can detect vibrations between approximately 5 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. The occurrence of engine knocking can be suppressed by delaying the ignition timing.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) Output voltage of knock sensor 0.5 V or less for 1 second or more (1 trip detection logic).
  • Short in knock sensor circuit

  • knock sensor

  • ECM

Comes on DTC stored
P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor) Output voltage of knock sensor 4.5 V or higher for 1 second or more (1 trip detection logic).
  • Open in knock sensor circuit

  • knock sensor

  • ECM

Comes on DTC stored

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 ignition switch is turned off.


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 and P0328 begins to run when 5 seconds have elapsed since the engine was started.

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the ignition switch off and wait for at least 30 seconds.

  5. Turn the ignition switch to ON and turn the GTS on.

  6. Start the engine and wait 5 minutes.

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

  8. Read the pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  10. Input the DTC: P0327 or P0328.

  11. Check the DTC judgment result.

    GTS Display Description
    NORMAL
    • DTC judgment completed

    • System normal

    ABNORMAL
    • DTC judgment completed

    • System abnormal

    INCOMPLETE
    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions

    N/A
    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, idle the engine for 5 minutes and check the DTC judgment result again.

WIRING DIAGRAM

A01QTUOE17

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. 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.

PROCEDURE


  1. READ VALUE USING GTS (KNOCK FEEDBACK VALUE)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

    4. Warm up the engine.

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


      Powertrain > Engine and ECT > Data List
      Tester Display
      Knock Feedback Value
    6. Read the value while driving the vehicle.

      OK
      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 with a high load, for example, by activating the air conditioning system and racing the engine.

      Result
      Proceed to
      OK
      NG

    OK
    NG
  2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK SENSOR)


    1. A01QRYOC07
      *a

      Front view of wire harness connector

      (to Knock Sensor)

      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 Condition Specified Condition
      E1-2 (KNK1) - E1-1 (E) Ignition switch ON 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG
    OK
  3. INSPECT KNOCK SENSOR


    1. Inspect the knock sensor.

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the knock sensor.

      Click here

      Result
      Proceed to
      OK
      NG

    OK
    NG
  4. CHECK HARNESS AND CONNECTOR (KNOCK SENSOR - ECM)


    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
      Tester Connection Condition Specified Condition
      E1-2 (KNK1) - B93-122 (KNK1) Always Below 1 Ω
      E1-1 (E) - B93-121 (EKNK) Always Below 1 Ω
      E1-2 (KNK1) or B93-122 (KNK1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK
    NG