Dtc C1511 Torque Sensor Circuit Malfunction

Lexus IS250 IS220d GSE20 ALE20 - POWER STEERING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - TORQUE SENSOR)

INSPECT POWER STEERING GEAR ASSEMBLY (TORQUE SENSOR)

REPLACE POWER STEERING ECU ASSEMBLY

INITIALIZE ROTATION ANGLE SENSOR AND CALIBRATE TORQUE SENSOR ZERO POINT

RECONFIRM DTC

DTC C1511 Torque Sensor Circuit Malfunction

DTC C1512 Torque Sensor Circuit Malfunction

DTC C1513 Torque Sensor Circuit Malfunction

DESCRIPTION

The torque sensor converts rotation torque input to the steering wheel into an electrical signal and sends it to the ECU. Based on this signal, the ECU detects steering effort.

DTC No.Detection ItemTrouble Area
C1511Torque sensor (TRQ1) signal error or stop
Wire harness
Torque sensor (built into power steering gear assembly)
Power steering ECU assembly
C1512Torque sensor (TRQ2) signal error or stop
Wire harness
Torque sensor (built into power steering gear assembly)
Power steering ECU assembly
C1513Deviation between torque sensors
Wire harness
Torque sensor (built into power steering gear assembly)
Power steering ECU assembly

WIRING DIAGRAM

Dtc C1511 Torque Sensor Circuit Malfunction. POWER STEERING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - TORQUE SENSOR)
Dtc C1511 Torque Sensor Circuit Malfunction. POWER STEERING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the C4 connector from the power steering ECU assembly.

Disconnect the C1 connector from the torque sensor.

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

  • Standard resistance:
  • Tester connection
    (Symbols)    		ConditionSpecified condition
    C1-1 (INCS) - C4-10 (INCS)AlwaysBelow 1 Ω
    C1-2 (INSN) - C4-9 (INSN)AlwaysBelow 1 Ω
    C1-4 (TRQV) - C4-4 (TRQV)AlwaysBelow 1 Ω
    C1-5 (OUCS) - C4-12 (OUCS)AlwaysBelow 1 Ω
    C1-6 (OUSN) - C4-11 (OUSN)AlwaysBelow 1 Ω
    C1-7 (TQG2) - C4-13 (TQG2)AlwaysBelow 1 Ω
    C1-8 (TQG1) - C4-6 (TQG1)AlwaysBelow 1 Ω
    C1-1 (INCS) - Body groundAlways10 kΩ or higher
    C1-2 (INSN) - Body groundAlways10 kΩ or higher
    C1-4 (TRQV) - Body groundAlways10 kΩ or higher
    C1-5 (OUCS) - Body groundAlways10 kΩ or higher
    C1-6 (OUSN) - Body groundAlways10 kΩ or higher
    C1-7 (TQG2) - Body groundAlways10 kΩ or higher
    C1-8 (TQG1) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
2.INSPECT POWER STEERING GEAR ASSEMBLY (TORQUE SENSOR)
Dtc C1511 Torque Sensor Circuit Malfunction. POWER STEERING. Lexus IS250 IS220d GSE20 ALE20

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

  • Standard resistance:
  • Tester connection
    (Symbols)    		ConditionSpecified condition
    C1-1 (INCS) - C1-7 (TQG2)Always90 to 170 Ω
    C1-2 (INSN) - C1-7 (TQG2)Always300 to 430 Ω
    C1-4 (TRQV) - C1-8 (TQG1)Always4 to 14 Ω
    C1-5 (OUCS) - C1-7 (TQG2)Always90 to 170 Ω
    C1-6 (OUSN) - C1-7 (TQG2)Always300 to 430 Ω
  • NOTICE:
  • If replacing the power steering gear assembly, clear the rotation angle sensor calibration value, initialize the rotation angle sensor value, and calibrate the torque sensor zero point .
NG
REPLACE POWER STEERING GEAR ASSEMBLY
OK
3.REPLACE POWER STEERING ECU ASSEMBLY

Replace the power steering ECU assembly .

NEXT
4.INITIALIZE ROTATION ANGLE SENSOR AND CALIBRATE TORQUE SENSOR ZERO POINT

Initialize the rotation angle sensor value and calibrate the torque sensor zero point .

NEXT
5.RECONFIRM DTC

Check for DTCs .

  • Result:
  • DTC ConditionProceed to
    DTC is not outputA
    DTC C1511, C1512, or C1513 is outputB
  • NOTICE:
  • If replacing the power steering gear assembly, clear the rotation angle sensor calibration value, initialize the rotation angle sensor value, and calibrate the torque sensor zero point .
B
REPLACE POWER STEERING GEAR ASSEMBLY
A
END