Toyota Venza manuals

Toyota Venza: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) (P0327,P0328)

Toyota Venza Service Manual / 1ar-fe Engine Control / Sfi System / Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) (P0327,P0328)

DESCRIPTION

Flat-type knock sensors (non-resonant type) have structures that can detect vibrations between approximately 5 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 Condition

Trouble Area

P0327

The output voltage of the knock sensor is below 0.5 V for 1 second or more (1 trip detection logic).

  • Short in knock sensor circuit
  • Knock sensor
  • ECM

P0328

The output voltage of the knock sensor is higher than 4.5 V for 1 second or more (1 trip detection logic).

  • Open in knock sensor circuit
  • Knock sensor
  • ECM

HINT:

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 ignition switch is turned off.

Reference: Inspection using an oscilloscope


The correct waveform is as shown.

Terminal No. (Symbol)

Tool Setting

Condition

B58-87 (KNK1) - B58-110 (EKNK)

1 V/DIV, 1 ms/DIV

Engine speed maintained at 4000 rpm after warming up engine

MONITOR DESCRIPTION

If the output voltage transmitted by the knock 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

Related DTCs

P0327: Knock Sensor Range Check (Low Voltage)

P0328: Knock Sensor Range Check (High Voltage)

Required Sensors/Components (Main)

Knock sensor

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

1 second

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs not stored

None

All of the following conditions are met

-

Battery voltage

10.5 V or higher

Time after engine start

5 seconds or more

Ignition switch

ON

Starter

OFF

TYPICAL MALFUNCTION THRESHOLDS

P0327: Knock Sensor Range Check (Low Voltage)

Knock sensor voltage

Below 0.5 V

P0328: Knock Sensor Range Check (High Voltage)

Knock sensor voltage

Higher than 4.5 V

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page ).

  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on.
  6. Start the engine and wait 5 seconds.
  7. Enter the following menus: Powertrain / Engine / Trouble Codes.
  8. Read the Pending DTCs.

    HINT:

    • 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 / Utility / All Readiness.
  10. Input the DTC: P0327 or P0328.
  11. Check the DTC judgment result.

    Techstream 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

    HINT:

    • 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.
  12. If no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the Techstream. 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 TECHSTREAM (KNOCK FEEDBACK VALUE)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Warm up the engine.

(e) Enter the following menus: Powertrain / Engine / Data List / Knock Feedback Value.

(f) Read the value while driving the vehicle.

OK:

The value changes.

Malfunction does not occur

Knock Feedback Value changes

Malfunctions occur

Knock Feedback Value does not change

HINT:

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.


OK

CHECK FOR INTERMITTENT PROBLEMS


NG

2.

INSPECT ECM (KNK1 VOLTAGE)

(a) Disconnect the knock sensor connector.


(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

U2-2 - U2-1

Ignition switch ON

4.5 to 5.5 V

Text in Illustration

*a

Front view of wire harness connector

(to Knock Sensor)


NG

GO TO STEP 4


OK

3.

INSPECT KNOCK SENSOR

(a) Inspect the knock control sensor (See page ).


HINT:

Perform "Inspection After Repair" after replacing the knock sensor (See page ).



OK

REPLACE ECM


NG

REPLACE KNOCK SENSOR

4.

CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR)

(a) Disconnect the knock sensor connector.

(b) Disconnect the ECM connector.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

U2-2 - B58-87 (KNK1)

Always

Below 1 Ω

U2-1 - B58-110 (EKNK)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

U2-2 or B58-87 (KNK1) - Body ground

Always

10 kΩ or higher


OK

REPLACE ECM


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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