SFI SYSTEM, 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 vibration 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 is less than 0.5 V for 1 second or more (1 trip detection logic).

  • Short in knock sensor circuit

  • Wire harness or connector

  • Knock sensor

  • ECM

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

  • Open in knock sensor circuit

  • Wire harness or connector

  • 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.

A0049Y4E27

Reference: Inspection using an oscilloscope

Tech Tips

The correct waveform is as shown.

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

MONITOR DESCRIPTION

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

MONITOR STRATEGY

Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON.

  3. Turn the GTS on.

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

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

  6. Turn the ignition switch to ON.

  7. Turn the GTS on.

  8. Start the engine and wait 5 minutes.

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

  10. 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.

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

  12. Input the DTC: P0327 or P0328.

  13. 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

A0046U2E01

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 / Knock Feedback Value.

    6. Read the values displayed on the GTS 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

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

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

    A004BDPC01
    *a

    Front view of wire harness connector

    (to Knock Sensor)

    1. 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
      E1-2 - E1-1 Ignition switch ON 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG

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

    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

    REPLACE ECM Click here

    NG

    REPLACE KNOCK SENSOR Click here

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


    1. Disconnect the B112 ECM connector.*1

    2. Disconnect the B118 ECM connector.*2

    3. Disconnect the E1 knock sensor connector.

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

      *1: for LHD

      *2: for RHD

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      B112-122 (KNK1) - E1-2 Always Below 1 Ω
      B112-121 (EKNK) - E1-1 Always Below 1 Ω
      B112-122 (KNK1) or E1-2 - Body ground and other terminals Always 10 kΩ or higher
      B112-121 (EKNK) or E1-1 - Body ground and other terminals Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      B118-122 (KNK1) - E1-2 Always Below 1 Ω
      B118-121 (EKNK) - E1-1 Always Below 1 Ω
      B118-122 (KNK1) or E1-2 - Body ground and other terminals Always 10 kΩ or higher
      B118-121 (EKNK) or E1-1 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR