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 is used. Flat type knock sensors (non-resonant type) have structures that can detect vibrations over a wide band of frequencies: 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. The 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

Tech Tips

When any of DTCs P0327 and P0328 are 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.

Reference: Inspection using an oscilloscope

A01VHSSE07
*a KNK1 Signal Waveform
*b 1 V/DIV.
*c 1 ms./DIV.

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 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.

If the malfunction is not repaired successfully, DTC P0327 or P0328 is stored 5 seconds after the engine is next started.

MONITOR STRATEGY

Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN


  1. Connect the intelligent tester to the DLC3.

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

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

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

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

  6. Start the engine and wait 5 minutes.

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

  8. Read 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.

    Tester 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

A01VJ1QE01
for LHD
*a Knock Sensor
*b (Shielded)
A01VJ1QE02
for RHD
*a Knock Sensor
*b (Shielded)

CAUTION / NOTICE / HINT

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, if the air-fuel ratio was lean or rich, 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 driving the vehicle.

      OK
      The values change.

      Tech Tips

      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.


    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. INSPECT ECM (KNK1 VOLTAGE)


    1. A01VJ8TE02
      Text in Illustration
      *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 Switch Condition Specified Condition
      E1-2 - E1-1 Ignition switch ON 4.5 to 5.5 V

    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 Repairs" after replacing the knock sensor Click here.


    OK

    REPLACE ECM Click here

    NG

    REPLACE KNOCK SENSOR Click here

  4. 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
      for LHD
      Tester Connection Condition Specified Condition
      E1-2 - B22-123 (KNK1) Always Below 1 Ω
      E1-1 - B22-124 (EKNK) Always Below 1 Ω
      E1-2 or B22-123 (KNK1) - Body ground Always 10 kΩ or higher
      E1-1 or B22-124 (EKNK) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      E1-2 - B23-123 (KNK1) Always Below 1 Ω
      E1-1 - B23-124 (EKNK) Always Below 1 Ω
      E1-2 or B23-123 (KNK1) - Body ground Always 10 kΩ or higher
      E1-1 or B23-124 (EKNK) - Body ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR