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

The knock control sensor is 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 The output voltage of the knock control sensor is 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 The output voltage of the knock control sensor is higher 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 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

A0043L2E01

Tech Tips

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

MONITOR DESCRIPTION

If the output voltage transmitted by the knock control 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.

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).

  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.

  9. 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.

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

  11. Input the DTC: P0327 or P0328.

  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 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

A0040ABE05

INSPECTION PROCEDURE

Tech Tips

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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. READ VALUE USING GTS (KNOCK FEEDBACK VALUE)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG) and turn the GTS 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 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. A0040EFE42
      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 Condition Specified Condition
      G1-2 - G1-1 Power switch on (IG) 4.5 to 5.5 V

    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
      Tester Connection Condition Specified Condition
      G1-2 - D28-87 (KNK1) Always Below 1 Ω
      G1-1 - D28-110 (EKNK) Always Below 1 Ω
      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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here