SFI SYSTEM, Diagnostic DTC:P0327, P0328, P0332, P0333

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)
P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
P0333 Knock Sensor 2 Circuit High Input (Bank 2)

DESCRIPTION

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

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. Any occurrence of engine knocking can be suppressed by delaying the ignition timing.

DTC No. DTC Detection Condition Trouble Area

P0327

P0332

Output voltage of knock sensor (bank 1 or 2) is less than 0.5 V

(1 trip detection logic)

  • Short in knock sensor (bank 1, 2) circuit

  • Knock sensor (bank 1, 2)

  • ECM

P0328

P0333

Output voltage of knock sensor (bank 1 or 2) is more than 4.5 V

(1 trip detection logic)

  • Open in knock sensor (bank 1, 2) circuit

  • Knock sensor (bank 1, 2)

  • ECM

Tech Tips

When any of DTCs P0327, P0328, P0332 and P0333 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 power switch is turned off.

Reference: Inspection using an oscilloscope

A000Q0QE02
*a KNK1 Signal Waveform
*b 1 V/DIV.
*c 1 ms./DIV.

The correct waveform is as shown in the illustration.

Item Content
ECM Terminal Name Between KNK1 and EKNK, or KNK2 and EKN2
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 1 second or more, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.

The monitor for DTCs P0327, P0328, P0332 and P0333 begins to run when 5 seconds have elapsed since the engine was started.

If the malfunction is not repaired successfully, DTC P0327, P0328, P0332 or P0333 is stored 5 seconds after the engine is next started.

MONITOR STRATEGY

Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

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

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

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

  5. Turn the power switch on (IG) and turn the GTS on.

  6. Put the engine in inspection mode (maintenance mode) Click here.

  7. Start the engine and wait 5 minutes.

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

  9. 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.

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

  11. Input the DTC: P0327, P0328, P0332 or P0333.

  12. 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's 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

A000NWXE02
*a Knock Sensor (Bank 1)
*b Shielded
*c Knock Sensor (Bank 2)

CAUTION / NOTICE / HINT

Tech Tips


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

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

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

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

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

  • 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. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in inspection mode (maintenance mode) Click here.

    5. Start the engine.

    6. Warm up the engine.

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

    8. 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 racing the engine.


    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

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


    1. A000O5YE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Knock Sensor)

      Disconnect the knock sensor connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J1-1 - J1-2 Power switch on (IG) 4.5 to 5.5 V
      J2-1 - J2-2 Power switch on (IG) 4.5 to 5.5 V

    4. Reconnect the knock sensor connector.


    NG

    CHECK HARNESS AND CONNECTOR (KNOCK SENSOR - ECM) 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.


    OK

    REPLACE ECM Click here

    NG

    REPLACE KNOCK SENSOR Click here

  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
      J1-2 - F5-83 (KNK1) Always Below 1 Ω
      J1-1 - F5-115 (EKNK) Always Below 1 Ω
      J2-2 - F5-84 (KNK2) Always Below 1 Ω
      J2-1 - F5-116 (EKN2) Always Below 1 Ω
      J1-2 or F5-83 (KNK1) - Body ground Always 10 kΩ or higher
      J1-1 or F5-115 (EKNK) - Body ground Always 10 kΩ or higher
      J2-2 or F5-84 (KNK2) - Body ground Always 10 kΩ or higher
      J2-1 or F5-116 (EKN2) - Body ground Always 10 kΩ or higher

    4. Reconnect the knock sensor connector.

    5. Reconnect the ECM connector.


    OK

    REPLACE ECM Click here

    NG

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