SFI SYSTEM, Diagnostic DTC:P0327, P0328, P032C, P032D, P0332, P0333, P033C, P033D

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)
P032C Knock Sensor 3 Circuit Low
P032D Knock Sensor 3 Circuit High
P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
P0333 Knock Sensor 2 Circuit High Input (Bank 2)
P033C Knock Sensor 4 Circuit Low Input
P033D Knock Sensor 4 Circuit High Input

DESCRIPTION

A flat-type knock sensor (non-resonant type) has a structure that can detect vibrations between approximately 5 kHz and 15 kHz.

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

Each 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 the knock sensor (for Bank 1 Sensor 1) is 0.5 V or less (1 trip detection logic).

  • Short in knock sensor (for Bank 1 Sensor 1) circuit


  • Knock sensor (for Bank 1 Sensor 1)


  • ECM
P0328 Output voltage of the knock sensor (for Bank 1 Sensor 1) is 4.5 V or higher (1 trip detection logic).

  • Open in knock sensor (for Bank 1 Sensor 1) circuit


  • Knock sensor (for Bank 1 Sensor 1)


  • ECM
P0332 Output voltage of the knock sensor (for Bank 2 Sensor 1) is 0.5 V or less (1 trip detection logic).

  • Short in knock sensor (for Bank 2 Sensor 1) circuit


  • Knock sensor (for Bank 2 Sensor 1)


  • ECM
P0333 Output voltage of the knock sensor (for Bank 2 Sensor 1) is 4.5 V or higher (1 trip detection logic).

  • Open in knock sensor (for Bank 2 Sensor 1) circuit


  • Knock sensor (for Bank 2 Sensor 1)


  • ECM
P032C Output voltage of the knock sensor (for Bank 1 Sensor 2) is 0.5 V or less (1 trip detection logic).

  • Short in knock sensor (for Bank 1 Sensor 2) circuit


  • Knock sensor (for Bank 1 Sensor 2)


  • ECM
P032D Output voltage of the knock sensor (for Bank 1 Sensor 2) is 4.5 V or higher (1 trip detection logic).

  • Open in knock sensor (for Bank 1 Sensor 2) circuit


  • Knock sensor (for Bank 1 Sensor 2)


  • ECM
P033C Output voltage of the knock sensor (for Bank 2 Sensor 2) is 0.5 V or less (1 trip detection logic).

  • Short in knock sensor (for Bank 2 Sensor 2) circuit


  • Knock sensor (for Bank 2 Sensor 2)


  • ECM
P033D Output voltage of the knock sensor (for Bank 2 Sensor 2) is 4.5 V or higher (1 trip detection logic).

  • Open in knock sensor (for Bank 2 Sensor 2) circuit


  • Knock sensor (for Bank 2 Sensor 2)


  • ECM

Tech Tips

When DTC P0327, P0328, P0332, P0333, P032C, P032D, P033C or P033D is stored, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is delayed to its maximum retardation. The ECM continues operating in fail-safe mode until the engine switch is turned off.

Reference: Inspection using an oscilloscope

A01ERHGE01
Standard
Tester Connection Tool Setting Condition Specified Condition
C54-94 (KNK1) - C54-93 (EKNK)

0.01 to 10 V/DIV.

0.01 to 10 msec./DIV.

 Engine speed at 4000 rpm with warm engine The correct waveform is as shown
C54-117 (KNK2) - C54-116 (EKN2)

0.01 to 10 V/DIV.

0.01 to 10 msec./DIV.

 Engine speed at 4000 rpm with warm engine The correct waveform is as shown
C54-96 (KNK3) - C54-95 (EKN3)

0.01 to 10 V/DIV.

0.01 to 10 msec./DIV.

 Engine speed at 4000 rpm with warm engine The correct waveform is as shown
C54-119 (KNK4) - C54-118 (EKN4)

0.01 to 10 V/DIV.

0.01 to 10 msec./DIV.

 Engine speed at 4000 rpm with warm engine The correct waveform is as shown

MONITOR DESCRIPTION

The knock sensor, located on the cylinder block, detects spark knock. When spark knock occurs, the piezoelectric element of the sensor vibrates. When the ECM detects a voltage in this frequency range, it retards the ignition timing to suppress the spark knock.

The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults in the sensor. If the knock sensor signal level is too low for more than 10 seconds, or if the knock sensor output voltage is outside the normal range, the ECM interprets this as a fault in the knock sensor and stores a DTC.

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on.

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

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

  5. Turn the engine switch on (IG) 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, P0328, P032C, P032D, P0332, P0333, P033C or P033D.

  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

A01ERL1E02

INSPECTION PROCEDURE

Tech Tips


  • DTCs P0327 and P0328 are for the bank 1 sensor 1 knock sensor circuit.

  • DTCs P032C and P032D are for the bank 1 sensor 2 knock sensor circuit.

  • DTCs P0332 and P0333 are for the bank 2 sensor 1 knock sensor circuit.

  • DTCs P033C and P033D are for the bank 2 sensor 2 knock sensor circuit.

  • Read freeze frame data using the GTS. Freeze frame data records the engine condition 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.

  • Bank 1 refers to the bank that includes the No. 1 cylinder*.

    *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

  • Bank 2 refers to the bank that does not include the No. 1 cylinder.

PROCEDURE


  1. INSPECT KNOCK SENSOR

    A01EQG2E08
    Text in Illustration
    *a

    Front view of wire harness connector

    (to ECM)

    1. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C54-94 (KNK1) - C54-93 (EKNK) 20°C (68°F) 120 to 280 kΩ
      C54-117 (KNK2) - C54-116 (EKN2) 20°C (68°F) 120 to 280 kΩ
      C54-96 (KNK3) - C54-95 (EKN3) 20°C (68°F) 120 to 280 kΩ
      C54-119 (KNK4) - C54-118 (EKN4) 20°C (68°F) 120 to 280 kΩ

    NG

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

    OK

  2. INSPECT ECM


    1. A01ER72E71
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Knock Sensor)

      Disconnect the U5, U6, U7 or U8 knock 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
      1 - 2 Engine switch on (IG) 4.5 to 5.5 V

    NG

    REPLACE ECM Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

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


    1. Disconnect the ECM connector.

    2. Disconnect the knock sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U5-2 - C54-94 (KNK1) Always Below 1 Ω
      U5-1 - C54-93 (EKNK) Always Below 1 Ω
      U6-2 - C54-117 (KNK2) Always Below 1 Ω
      U6-1 - C54-116 (EKN2) Always Below 1 Ω
      U7-2 - C54-96 (KNK3) Always Below 1 Ω
      U7-1 - C54-95 (EKN3) Always Below 1 Ω
      U8-2 - C54-119 (KNK4) Always Below 1 Ω
      U8-1 - C54-118 (EKN4) Always Below 1 Ω
      U5-2 or C54-94 (KNK1) - Body ground Always 10 kΩ or higher
      U5-1 or C54-93 (EKNK) - Body ground Always 10 kΩ or higher
      U6-2 or C54-117 (KNK2) - Body ground Always 10 kΩ or higher
      U6-1 or C54-116 (EKN2) - Body ground Always 10 kΩ or higher
      U7-2 or C54-96 (KNK3) - Body ground Always 10 kΩ or higher
      U7-1 or C54-95 (EKN3) - Body ground Always 10 kΩ or higher
      U8-2 or C54-119 (KNK4) - Body ground Always 10 kΩ or higher
      U8-1 or C54-118 (EKN4) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE KNOCK SENSOR Click here