Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Engine Control. Yaris. Ncp93, 131

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM (KNOCK FEEDBACK VALUE)

CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK SENSOR)

INSPECT KNOCK SENSOR

CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR)

DTC P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

DTC P0328 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 between approximately 5 kHz and 15 kHz.
Knock sensor is 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).
  1. Short in knock sensor circuit
  1. Knock sensor
  1. ECM
P0328
The output voltage of the knock sensor is higher than 4.5 V for 1 second or more (1 trip detection logic).
  1. Open in knock sensor circuit
  1. Knock sensor
  1. 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
Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)
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 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.
If the malfunction is not repaired successfully, DTC P0327 or P0328 is stored 5 seconds after the engine is next 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 present
None
Battery voltage
10.5 V or higher
Time after engine start
5 seconds or more

TYPICAL MALFUNCTION THRESHOLDS


Knock Sensor Range Check (Low Voltage) P0327
Knock sensor voltage
Below 0.5 V

Knock Sensor Range Check (High Voltage) P0328
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 DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  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 minutes.
  7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
  8. Read pending DTCs.
    HINT:
    1. If a pending DTC is output, the system is malfunctioning.
    2. 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 or P0328.
  11. Check the DTC judgment result.

    Techstream Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    N/A
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    HINT:
    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
    3. 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 (YARIS_NCP93 RM000000PDK0T5X.html).
    HINT:
    1. If a permanent DTC is output, the system is malfunctioning.
    2. If no permanent DTC is output, the system is normal.

WIRING DIAGRAM


Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)


INSPECTION PROCEDURE

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.
1.READ VALUE USING TECHSTREAM (KNOCK FEEDBACK VALUE)

  1. Connect the Techstream to the DLC3.

  1. Start the engine.

  1. Turn the Techstream on.

  1. Warm up the engine.

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

  1. Read the value while driving the vehicle.

    OK:
    The value changes.
    HINT:
    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
Go to step 2
OK

CHECK FOR INTERMITTENT PROBLEMS (YARIS_NCP93 RM000000PDQ0Q2X.html)

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


    Yaris. Ncp93, 131.1Nz-Fe Engine Control.Sfi System (For Sedan). Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor)

  1. Disconnect the knock sensor connector.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    P10-2 - P10-1
    		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

  1. Inspect the knock sensor (YARIS_NCP93 RM000003VIF00HX.html).

    HINT:
    Perform "Inspection After Repair" after replacing the knock sensor (YARIS_NCP93 RM000004NJD006X.html).


NG
REPLACE KNOCK SENSOR (YARIS_NCP93 RM000003VIH00IX.html)
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002IX.html)

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

  1. Disconnect the knock sensor connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    P10-2 - C51-123 (KNK1)
    		Always
    		Below 1 Ω
    P10-1 - C51-124 (EKNK)
    		Always
    		Below 1 Ω
    P10-2 or C51-123 (KNK1) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002IX.html)