SFI SYSTEM (w/o Secondary Air Injection System), Diagnostic DTC:P0327/52, P0328/52

DTC Code DTC Name
P0327/52 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
P0328/52 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

DESCRIPTION

A flat type knock sensor (non-resonant type) has a structure that can detect vibrations over a wide band of frequencies: between approximately 6 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 Conditions Trouble Areas
P0327/52

Output voltage of knock sensor 0.5 V or less

(1 trip detection logic)

  • Short in knock sensor circuit

  • Knock sensor

  • ECM
P0328/52

Output voltage of knock sensor 4.5 V or more

(1 trip detection logic)

  • Open in knock sensor circuit

  • Knock sensor

  • ECM

Tech Tips

When any of DTCs P0327 and P0328 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 ignition switch is turned to OFF.

Reference: Inspection using an oscilloscope

The correct waveform is shown.

A01BI05E01
Items Contents
Terminals KNK1 - EKNK
Equipment Settings

0.01 to 10 V/Division,

0.01 to 10 msec./Division
Conditions Keep engine speed at 4,000 rpm with warm engine

MONITOR DESCRIPTION

If the output voltage transmitted by the knock sensor remains low or high for more than 1 seconds, the ECM interprets this as a malfunction in the sensor circuit, and sets a DTC.

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

If the malfunction is not repaired successfully, any of DTC P0327 or P0328 is set 5 seconds after the engine is next started.

WIRING DIAGRAM

A01BD8JE01

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using an 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 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. CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR)


    1. A01BC59E19

      Disconnect the D1 ECM connector.

    2. Measure the resistance between the terminals of the ECM connector.

      Resistance
      Tester Connections Specified Conditions
      KNK1 (D1-29) - EKNK (D1-30) 120 to 280 kΩ at 20°C (68°F)

    3. Reconnect the ECM connector.


    NG

    INSPECT KNOCK CONTROL SENSOR Click here

    OK

  2. INSPECT ECM (KNK1 VOLTAGE)


    1. A01BBVZE01

      Disconnect the D1 ECM connector.

    2. Turn the ignition switch to the ON position.

    3. Measure the voltage between the ECM terminals.

      Voltage
      Tester Connections Specified Conditions
      KNK1 (D1-29) - EKNK (D1-30) 4.5 to 5.5 V

    4. Reconnect the ECM connector.

      Note

      Faults may be intermittent. Check the wire harness and connector carefully and retest.


    NG

    REPLACE ECM

    OK

    CHECK FOR INTERMITTENT PROBLEMS

  3. INSPECT KNOCK CONTROL SENSOR


    1. A01BGHEE07

      Remove the knock sensor.

    2. Measure the resistance between the terminals.

      Resistance
      Tester Connections Specified Conditions
      KNK1 (g1-2) - EKNK (g1-1) 120 to 280 kΩ at 20°C (68°F)

    3. Reinstall the knock sensor.


    NG

    REPLACE KNOCK CONTROL SENSOR

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR