SFI SYSTEM(w/o EGR System), Diagnostic DTC:P0327,P0328,P032C,P032D,P0332,P0333,P033C and P033D

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)
P032C Knock Sensor 3 Circuit Low
P032D Knock Sensor 3 Circuit High
P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
P0333 Knock Sensor 2 Circuit High Input (Bank 2)
P033C Knock Sensor 4 Circuit Low Input
P033D Knock Sensor 4 Circuit High Input

DESCRIPTION

A150243E05

A flat-type knock sensor (non-resonant type) has a structure that can detect vibrations between approximately 6 kHz and 15 kHz.

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

Each 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.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

P0327

Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

Output voltage of the knock sensor (for Bank 1 Sensor 1) is 0.5 V or less (1 trip detection logic).

  • Short in knock sensor (for Bank 1 Sensor 1) circuit

  • Knock sensor (for Bank 1 Sensor 1)

  • ECM

Comes on

DTC stored

P0328

Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

Output voltage of the knock sensor (for Bank 1 Sensor 1) is 4.5 V or higher (1 trip detection logic).

  • Open in knock sensor (for Bank 1 Sensor 1) circuit

  • Knock sensor (for Bank 1 Sensor 1)

  • ECM

Comes on

DTC stored

P032C

Knock Sensor 3 Circuit Low

Output voltage of the knock sensor (for Bank 1 Sensor 2) is 0.5 V or less (1 trip detection logic).

  • Short in knock sensor (for Bank 1 Sensor 2) circuit

  • Knock sensor (for Bank 1 Sensor 2)

  • ECM

Comes on

DTC stored

P032D

Knock Sensor 3 Circuit High

Output voltage of the knock sensor (for Bank 1 Sensor 2) is 4.5 V or higher (1 trip detection logic).

  • Open in knock sensor (for Bank 1 Sensor 2) circuit

  • Knock sensor (for Bank 1 Sensor 2)

  • ECM

Comes on

DTC stored

P0332

Knock Sensor 2 Circuit Low Input (Bank 2)

Output voltage of the knock sensor (for Bank 2 Sensor 1) is 0.5 V or less (1 trip detection logic).

  • Short in knock sensor (for Bank 2 Sensor 1) circuit

  • Knock sensor (for Bank 2 Sensor 1)

  • ECM

Comes on

DTC stored

P0333

Knock Sensor 2 Circuit High Input (Bank 2)

Output voltage of the knock sensor (for Bank 2 Sensor 1) is 4.5 V or higher (1 trip detection logic).

  • Open in knock sensor (for Bank 2 Sensor 1) circuit

  • Knock sensor (for Bank 2 Sensor 1)

  • ECM

Comes on

DTC stored

P033C

Knock Sensor 4 Circuit Low Input

Output voltage of the knock sensor (for Bank 2 Sensor 2) is 0.5 V or less (1 trip detection logic).

  • Short in knock sensor (for Bank 2 Sensor 2) circuit

  • Knock sensor (for Bank 2 Sensor 2)

  • ECM

Comes on

DTC stored

P033D

Knock Sensor 4 Circuit High Input

Output voltage of the knock sensor (for Bank 2 Sensor 2) is 4.5 V or higher (1 trip detection logic).

  • Open in knock sensor (for Bank 2 Sensor 2) circuit

  • Knock sensor (for Bank 2 Sensor 2)

  • ECM

Comes on

DTC stored
Tip:

When DTC P0327, P0328, P0332, P0333, P032C, P032D, P033C or P033D is stored, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is delayed to its maximum retardation. The ECM continues operating in fail-safe mode until the engine switch is turned off.

Reference: Inspection using an oscilloscope

Standard

Tester Connection

Tool Setting

Condition

Specified Condition

C29-11 (KNK1) - C29-12 (EKNK)

0.01 to 10 V/DIV.

0.01 to 10 msec./DIV.

Engine speed at 4000 rpm with warm engine

The correct waveform is as shown

C29-5 (KNK2) - C29-6 (EKN2)

0.01 to 10 V/DIV.

0.01 to 10 msec./DIV.

Engine speed at 4000 rpm with warm engine

The correct waveform is as shown

C29-9 (KNK3) - C29-10 (EKN3)

0.01 to 10 V/DIV.

0.01 to 10 msec./DIV.

Engine speed at 4000 rpm with warm engine

The correct waveform is as shown

C29-3 (KNK4) - C29-4 (EKN4)

0.01 to 10 V/DIV.

0.01 to 10 msec./DIV.

Engine speed at 4000 rpm with warm engine

The correct waveform is as shown

MONITOR DESCRIPTION

The knock sensor, located on the cylinder block, detects spark knock. When spark knock occurs, the piezoelectric element of the sensor vibrates. When the ECM detects a voltage in this frequency range, it retards the ignition timing to suppress the spark knock.

The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults in the sensor. If the knock sensor signal level is too low for more than 10 seconds, or if the knock sensor output voltage is outside the normal range, the ECM interprets this as a fault in the knock sensor and stores a DTC.

CONFIRMATION DRIVING PATTERN

  1. Connect the intelligent tester to the DLC3.

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

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

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

  5. Turn the engine switch on (IG) and turn the tester on.

  6. Start the engine and wait 5 minutes.

  7. Enter the following menus: Powertrain / Engine and ECT / DTC.

  8. Read the pending DTCs.

    Tip:

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

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

  10. Input the DTC: P0327, P0328, P032C, P032D, P0332, P0333, P033C or P033D.

  11. Check the DTC judgment result.

    Tester 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
    Tip:

    • 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

A231463E03

CAUTION / NOTICE / HINT

Tip:

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

  • DTCs P032C and P032D are for the bank 1 sensor 2 knock sensor circuit.

  • DTCs P0332 and P0333 are for the bank 2 sensor 1 knock sensor circuit.

  • DTCs P033C and P033D are for the bank 2 sensor 2 knock sensor circuit.

  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. 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.

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

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

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

PROCEDURE

  1. INSPECT KNOCK SENSOR

    1. C214336C08

      *a

      Rear view of wire harness connector

      (ECM)

      Disconnect the ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      C29-11 (KNK1) - C29-12 (EKNK)

      20°C (68°F)

      120 to 280 kΩ

      C29-5 (KNK2) - C29-6 (EKN2)

      20°C (68°F)

      120 to 280 kΩ

      C29-9 (KNK3) - C29-10 (EKN3)

      20°C (68°F)

      120 to 280 kΩ

      C29-3 (KNK4) - C29-4 (EKN4)

      20°C (68°F)

      120 to 280 kΩ

      Result

      Result

      OK

      NG
    NG

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

    OK

  2. INSPECT ECM

    1. A225616C03

      *a

      Component with harness connected

      (ECM)

      Disconnect the Ch1 connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      C29-11 (KNK1) - C29-12 (EKNK)

      Engine switch on (IG)

      4.5 to 5.5 V

      C29-5 (KNK2) - C29-6 (EKN2)

      Engine switch on (IG)

      4.5 to 5.5 V

      C29-9 (KNK3) - C29-10 (EKN3)

      Engine switch on (IG)

      4.5 to 5.5 V

      C29-3 (KNK4) - C29-4 (EKN4)

      Engine switch on (IG)

      4.5 to 5.5 V

      Result

      Result

      OK

      NG
    OK

    CHECK FOR INTERMITTENT PROBLEMS

    Click here

    NG

    REPLACE ECM

    Click here

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

    1. Disconnect the ECM connector.

    2. Disconnect the knock sensor connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      h1-2 - C29-11 (KNK1)

      Always

      Below 1 Ω

      h1-1 - C29-12 (EKNK)

      Always

      Below 1 Ω

      h2-2 - C29-5 (KNK2)

      Always

      Below 1 Ω

      h2-1 - C29-6 (EKN2)

      Always

      Below 1 Ω

      h3-2 - C29-9 (KNK3)

      Always

      Below 1 Ω

      h3-1 - C29-10 (EKN3)

      Always

      Below 1 Ω

      h4-2 - C29-3 (KNK4)

      Always

      Below 1 Ω

      h4-1 - C29-4 (EKN4)

      Always

      Below 1 Ω

      h1-2 or C29-11 (KNK1) - Body ground

      Always

      10 kΩ or higher

      h1-1 or C29-12 (EKNK) - Body ground

      Always

      10 kΩ or higher

      h2-2 or C29-5 (KNK2) - Body ground

      Always

      10 kΩ or higher

      h2-1 or C29-6 (EKN2) - Body ground

      Always

      10 kΩ or higher

      h3-2 or C29-9 (KNK3) - Body ground

      Always

      10 kΩ or higher

      h3-1 or C29-10 (EKN3) - Body ground

      Always

      10 kΩ or higher

      h4-2 or C29-3 (KNK4) - Body ground

      Always

      10 kΩ or higher

      h4-1 or C29-4 (EKN4) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    OK

    REPLACE KNOCK SENSOR

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR