SFI SYSTEM (w/o EGR 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 control sensor is used. Flat type knock control sensors (non-resonant type) have a structure that can detect vibrations over a wide band of frequencies: between approximately 5 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. Occurrence of engine knocking can be suppressed by delaying the ignition timing.

DTC No. DTC Detection Condition Trouble Area
P0327

Output voltage of knock control sensor less than 0.5 V for 1 second or more

(1 trip detection logic)

  • Short in knock control sensor circuit

  • Knock control sensor

  • ECM
P0328

Output voltage of knock control sensor more than 4.5 V for 1 second or more

(1 trip detection logic)

  • Open in knock control sensor circuit

  • Knock control sensor

  • ECM

Tech Tips

When either 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 power switch is turned off.

Reference: Inspection using an oscilloscope

A01JAH1E01

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 2500 rpm after warming up engine

WIRING DIAGRAM

A01J9ABE01

INSPECTION PROCEDURE

Tech Tips

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. READ VALUE USING INTELLIGENT TESTER (KNOCK FEEDBACK VALUE)


    1. Connect the intelligent tester to the DLC3.

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

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

    4. Start the engine.

    5. Warm up the engine.

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

    7. 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 activating the air conditioning system and racing the engine.


    NG

    CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK CONTROL SENSOR) Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

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


    1. A01JB7XE38
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Knock Control Sensor)

      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
      G1-2 - G1-1 Power switch on (IG) 4.5 to 5.5 V

    4. Reconnect the knock control sensor connector.


    NG

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

    OK

  3. INSPECT KNOCK CONTROL SENSOR


    1. Inspect the knock control sensor Click here.


    NG

    REPLACE KNOCK CONTROL SENSOR Click here

    OK

    REPLACE ECM Click here

  4. 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
      G1-2 - D28-87 (KNK1) Always Below 1 Ω
      G1-1 - D28-110 (EKNK) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      G1-2 or D28-87 (KNK1) - Body ground Always 10 kΩ or higher
      G1-1 or D28-110 (EKNK) - Body ground Always 10 kΩ or higher

    4. Reconnect the knock control sensor connector.

    5. Reconnect the ECM connector.


    NG

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

    OK

    REPLACE ECM Click here