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

Engine Hybrid System. Corolla. Zre142 Aze141
2Az-Fe Engine Control. Corolla. Zre142 Aze141

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)

INSPECT ECM (KNK1 VOLTAGE)

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.
The 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
Output voltage of knock sensor less than 0.5 V for 1 second or more
(1 trip detection logic)
  1. Short in knock sensor circuit
  2. Knock sensor
  3. ECM
P0328
Output voltage of knock sensor more than 4.5 V for 1 second or more
(1 trip detection logic)
  1. Open in knock sensor circuit
  2. Knock sensor
  3. ECM
HINT:
When any of DTCs P0327 and P0328 are 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
Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System. 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 msec/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 1 second or more, 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 are not present
None
Time after engine start
5 seconds or more
Battery voltage
10.5 V or more
Ignition switch
ON
Starter
Off

TYPICAL MALFUNCTION THRESHOLDS


Knock Sensor Range Check (Low Voltage)
Knock sensor voltage
Less than 0.5 V

Knock Sensor Range Check (High Voltage)
Knock sensor voltage
More 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).
  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 the 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 (COROLLA_ZRE142 RM000000PDK0ZBX.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


Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System. 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 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.
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
    Malfunction occurs
    		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 (COROLLA_ZRE142 RM000000PDQ0VNX.html)

2.INSPECT ECM (KNK1 VOLTAGE)


    Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System. 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
    		Condition
    		Specified Condition
    B35-2 - B35-1
    		Ignition switch ON
    		4.5 to 5.5 V

  1. Reconnect the knock sensor connector.



NG
Go to step 4
OK


3.INSPECT KNOCK SENSOR

  1. Inspect the knock sensor (COROLLA_ZRE142 RM0000017UG03KX.html).



NG
REPLACE KNOCK SENSOR (COROLLA_ZRE142 RM0000017UH04HX.html)
OK

REPLACE ECM (COROLLA_ZRE142 RM000002WT402ZX.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 (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    B35-2 - B31-110 (KNK1)
    		Always
    		Below 1 Ω
    B35-1 - B31-111 (EKNK)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    B35-2 or B31-110 (KNK1) - Body ground
    		Always
    		10 kΩ or higher
    B35-1 or B31-111 (EKNK) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the knock sensor connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - KNOCK SENSOR)
OK

REPLACE ECM (COROLLA_ZRE142 RM000002WT402ZX.html)