SFI SYSTEM (w/o EGR 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 control sensor (non-resonant type) has a structure that can detect vibration between approximately 6 kHz and 15 kHz.

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

The knock control 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 control sensor (bank 1 or 2) is 0.5 V or less

(1 trip detection logic)


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

  • Knock control sensor (bank 1, 2)

  • ECM

P0328

P0333

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

(1 trip detection logic)


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

  • Knock control 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

A01NGS5E02

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 2500 rpm after warming up engine

WIRING DIAGRAM

A01NDE8E02

INSPECTION PROCEDURE

Tech Tips


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

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

  • Read freeze frame data using the intelligent tester. 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. INSPECT ECM (KNK1, KNK2 VOLTAGE)


    1. A01NFSPE23
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Knock Control Sensor)

      *2 Bank 1
      *3 Bank 2

      Disconnect the knock control 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 Switch Condition Specified Condition
      b2-1 - b2-2 Power switch on (IG) 4.5 to 5.5 V
      b1-1 - b1-2 Power switch on (IG) 4.5 to 5.5 V
    4. Reconnect the knock control sensor connector.


    NG
    OK
  2. INSPECT KNOCK CONTROL SENSOR


    1. Inspect the knock control sensor Click here.


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


    1. Disconnect the knock control sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      b2-2 - D1-116 (KNK1) Always Below 1 Ω
      b2-1 - D1-117 (EKNK) Always Below 1 Ω
      b1-2 - D1-83 (KNK2) Always Below 1 Ω
      b1-1 - D1-84 (EKN2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      b2-2 or D1-116 (KNK1) - Body ground Always 10 kΩ or higher
      b2-1 or D1-117 (EKNK) - Body ground Always 10 kΩ or higher
      b1-2 or D1-83 (KNK2) - Body ground Always 10 kΩ or higher
      b1-1 or D1-84 (EKN2) - Body ground Always 10 kΩ or higher
    4. Reconnect the knock control sensor connector.

    5. Reconnect the ECM connector.


    NG
    OK