Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT)

CHECK WIRE HARNESS AND CONNECTOR (CONNECTOR - ECM)

INSPECT ECM

INSPECT KNOCK SENSOR

CHECK HARNESS AND CONNECTOR (CONNECTOR - 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)

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

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

DESCRIPTION

A flat type knock sensor (non-resonant type) has a structure that can detect vibrations over a wide band of frequencies: between approximately 6 kHz 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 ConditionTrouble Area
P0327
P0332		Output voltage of knock sensor 1 or 2 is 0.5 V or less
(1 trip detection logic)
Short in knock sensor 1 or 2 circuit
Knock sensor 1 or 2
ECM
P0328
P0333		Output voltage of knock sensor 1 or 2 is 4.5 V or more
(1 trip detection logic)
Open in knock sensor 1 or 2 circuit
Knock sensor 1 or 2
ECM
  • HINT:
  • When any of DTCs P0327, P0328, P0332 and P0333 are set, 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 engine switch is turned to OFF.

Reference: Inspection using an oscilloscope


Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

The correct waveform is as shown.

ItemContent
TerminalsKNK1 - EKNK
or
KNK2 -EKN2
Equipment Settings0.01 to 10 V/DIV.,
0.01 to 10 ms./DIV.
ConditionsKeep engine speed at 4,000 rpm with warm engine

WIRING DIAGRAM

Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

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 intelligent tester. Freeze frame data records the engine conditions 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 .
1.READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT)
Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the EG1 connector.

Using lead wires, connect the connectors as follows.

Male Connector - Female Connector
Terminal 4 - Terminal 1
Terminal 5 - Terminal 2
Terminal 1 - Terminal 4
Terminal 2 - Terminal 5

Warm up the engine.

Run the engine at 3,000 rpm for 10 seconds or more.

Connect the intelligent tester to the DLC3.

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

Enter the following menus: Power train / Engine / DTC.

Read DTCs.

  • Result:
  • DisplayProceed to
    DTCs same as when vehicle brought in P0327, P0328 → P0327, P0328 or P0332, P0333 → P0332, P0333A
    DTCs different from when vehicle brought in P0327, P0328 → P0332, P0333 or P0332, P0333 → P0327, P0328B

Reconnect the EG1 connector.

B
Go to step 4
A
2.CHECK WIRE HARNESS AND CONNECTOR (CONNECTOR - ECM)
Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the EG1 connector.

Disconnect the E4 ECM connector.

Measure the resistance.

  • Standard resistance (Check for open):
  • Tester ConnectionSpecified Condition
    EG1 female connector 4 - KNK1 (E4-28)Below 1 Ω
    EG1 female connector 5 - EKNK (E4-30)Below 1 Ω
    EG1 female connector 1 - KNK2 (E4-29)Below 1 Ω
    EG1 female connector 2 - EKN2 (E4-31)Below 1 Ω
  • Standard resistance (Check for short):
  • Tester ConnectionSpecified Condition
    EG1 female connector 4 or KNK1 (E4-28) - Body ground10 kΩ or higher
    EG1 female connector 5 or EKNK (E4-30) - Body ground10 kΩ or higher
    EG1 female connector 1 or KNK2 (E4-29) - Body ground10 kΩ or higher
    EG1 female connector 2 or EKN2 (E4-31) - Body ground10 kΩ or higher

Reconnect the EG1 connector.

Reconnect the ECM connector.

NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
3.INSPECT ECM
Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the EG1 connector.

Turn the engine switch on (IG).

Measure the voltage between the EG1 terminals.

  • Standard voltage:
  • Tester ConnectionSpecified Condition
    EG1 female connector 4 - 54.5 to 5.5 V
    EG1 female connector 1 - 24.5 to 5.5 V

Reconnect the ECM connector.

NG
REPLACE ECM
OK
CHECK FOR INTERMITTENT PROBLEMS
4.INSPECT KNOCK SENSOR
Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the EG1 connector.

Measure the resistance of the EG1 male connector.

  • Standard resistance:
  • Tester ConnectionSpecified Condition
    EG1 male connector 4 - 5120 to 280 kΩ
    EG1 male connector 1 - 2120 to 280 kΩ

Reconnect the EG1 connector.

OK
CHECK FOR INTERMITTENT PROBLEMS
NG
5.CHECK HARNESS AND CONNECTOR (CONNECTOR - KNOCK SENSOR)
  • HINT:
If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the right bank side.
If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the left bank side.
Dtc P0327 Knock Sensor 1 Circuit Low Input (Bank 1 Or Single Sensor). 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the EG1 connector.

Disconnect the G1 and G2 knock sensor connectors.

Measure the resistance of the wire harness side connector.

  • Standard resistance (Check for open):
  • Tester ConnectionSpecified Condition
    EG1 male connector 4 - G1-2Below 1 Ω
    EG1 male connector 5 - G1-1 Below 1 Ω
    EG1 male connector 1 - G2-2Below 1 Ω
    EG1 male connector 2 - G2-1Below 1 Ω
  • Standard resistance (Check for short):
  • Tester ConnectionSpecified Condition
    EG1 male connector 4 or G1-2 - Body ground10 kΩ or higher
    EG1 male connector 5 or G1-1 - Body ground10 kΩ or higher
    EG1 male connector 1 or G2-2 - Body ground10 kΩ or higher
    EG1 male connector 2 or G2-1 - Body ground10 kΩ or higher

Reconnect the EG1 connector.

Reconnect the knock sensor connector.

NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE KNOCK SENSOR
LEXUS IS250, IS220d / GSE20 ALE20
4GR-FSE ENGINE CONTROL SYSTEM
Lexus IS250 IS220d GSE20 ALE20
SFI SYSTEM