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

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1GR-FE ENGINE CONTROL

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK KNOCK SENSOR

CHECK TERMINAL VOLTAGE (ECM)

CHECK HARNESS AND CONNECTOR (KNOCK SENSOR - ECM)

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)

DTC P0332 Knock Sensor 2 Circuit Low Input (Bank 2)

DTC P0333 Knock Sensor 2 Circuit High Input (Bank 2)

DESCRIPTION

Flat-type knock sensors (non-resonant type) have structures that can detect vibrations between approximately 6 kHz and 15 kHz.


2 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.DTC Detection ConditionTrouble Area
P0327
P0332		Output voltage of the knock sensor is below 0.5 V (1 trip detection logic).
Short in knock sensor circuit
Knock sensor
ECM
P0328
P0333		Output voltage of the knock sensor is higher than 4.5 V (1 trip detection logic).
Open in knock sensor circuit
Knock sensor
ECM
  • HINT:
  • When DTC P0327, P0328, P0332 or P0333 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 ignition switch is turned off.

Reference: Inspection using an oscilloscope


Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor). 1GR-FE ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

The correct waveform is as shown.

ItemContent
TerminalKNK1 - EKNK
KNK2 - EKN2
Equipment Setting1 V/DIV.
0.01 to 1 msec./DIV.
ConditionEngine speed at 4000 rpm with warm 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, P0328, P0332 and P0333 begins to run 5 seconds after the engine is started.


If the malfunction is not repaired successfully, DTC P0327, P0328, P0332 or P0333 is stored 5 seconds after the engine is next started.


WIRING DIAGRAM

Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor). 1GR-FE ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

  • HINT:
DTCs P0327 and P0328 are for the bank 1 knock sensor circuit.
DTCs P0332 and P0333 are for the bank 2 knock sensor circuit.
Read freeze frame data using the GTS. 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.
1.CHECK KNOCK SENSOR
Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor). 1GR-FE ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the ECM connector.

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

  • Standard Resistance:
  • for LHD
    Tester ConnectionConditionSpecified Condition
    C45-94 (KNK1) - C45-93 (EKNK)20°C (68°F)120 to 280 kΩ
    C45-117 (KNK2) - C45-116 (EKN2)20°C (68°F)120 to 280 kΩ
  • for RHD
    Tester ConnectionConditionSpecified Condition
    C46-94 (KNK1) - C46-93 (EKNK)20°C (68°F)120 to 280 kΩ
    C46-117 (KNK2) - C46-116 (EKN2)20°C (68°F)120 to 280 kΩ
Text in Illustration
*Afor LHD
*Bfor RHD
*aRear view of wire harness connector
(to ECM)
NG
Go to step 3
OK
2.CHECK TERMINAL VOLTAGE (ECM)
Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor). 1GR-FE ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the CU1 connector.

Turn the ignition switch to ON.

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

  • Standard Voltage:
  • Tester ConnectionSwitch ConditionSpecified Condition
    CU1 female connector 2 - 5Ignition switch ON4.5 to 5.5 V
    CU1 female connector 4 - 6Ignition switch ON4.5 to 5.5 V
Text in Illustration
*1Female
*aFront view of wire harness connector
(to ECM Wire)
NG
REPLACE ECM ()
OK
CHECK FOR INTERMITTENT PROBLEMS ()
3.CHECK HARNESS AND CONNECTOR (KNOCK SENSOR - ECM)

Disconnect the knock sensor connectors.

Disconnect the ECM connector.

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

  • Standard Resistance:
  • for LHD
    Tester ConnectionConditionSpecified Condition
    U2-2 - C45-94 (KNK1)AlwaysBelow 1 Ω
    U2-1 - C45-93 (EKNK)AlwaysBelow 1 Ω
    U1-2 - C45-117 (KNK2)AlwaysBelow 1 Ω
    U1-1 - C45-116 (EKN2)AlwaysBelow 1 Ω
    U2-2 or C45-94 (KNK1) - Body groundAlways10 kΩ or higher
    U2-1 or C45-93 (EKNK) - Body groundAlways10 kΩ or higher
    U1-2 or C45-117 (KNK2) - Body groundAlways10 kΩ or higher
    U1-1 or C45-116 (EKN2) - Body groundAlways10 kΩ or higher
  • for RHD
    Tester ConnectionConditionSpecified Condition
    U2-2 - C46-94 (KNK1)AlwaysBelow 1 Ω
    U2-1 - C46-93 (EKNK)AlwaysBelow 1 Ω
    U1-2 - C46-117 (KNK2)AlwaysBelow 1 Ω
    U1-1 - C46-116 (EKN2)AlwaysBelow 1 Ω
    U2-2 or C46-94 (KNK1) - Body groundAlways10 kΩ or higher
    U2-1 or C46-93 (EKNK) - Body groundAlways10 kΩ or higher
    U1-2 or C46-117 (KNK2) - Body groundAlways10 kΩ or higher
    U1-1 or C46-116 (EKN2) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE KNOCK SENSOR ()