Lexus IS250 · Service Manual STEERING

C1511

Diagnostic trouble codes

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 Item
 Trouble Area
C1511
 Torque sensor (TRQ1) signal error or stop
  1. Wire harness
  2. Torque sensor (built into power steering gear assembly)
  3. Power steering ECU assembly
C1512
 Torque sensor (TRQ2) signal error or stop
  1. Wire harness
  2. Torque sensor (built into power steering gear assembly)
  3. Power steering ECU assembly
C1513
 Deviation between torque sensors
  1. Wire harness
  2. Torque sensor (built into power steering gear assembly)
  3. Power steering ECU assembly

WIRING DIAGRAM

C106487E08

INSPECTION PROCEDURE


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

  1. C116652E01
    Disconnect the C4 connector from the power steering ECU assembly.

  1. Disconnect the C1 connector from the torque sensor.

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

    Standard resistance:
    Tester connection
    (Symbols)
    		 Condition
    		 Specified condition
    C1-1 (INCS) - C4-10 (INCS)
    		 Always
    		 Below 1 Ω
    C1-2 (INSN) - C4-9 (INSN)
    		 Always
    		 Below 1 Ω
    C1-4 (TRQV) - C4-4 (TRQV)
    		 Always
    		 Below 1 Ω
    C1-5 (OUCS) - C4-12 (OUCS)
    		 Always
    		 Below 1 Ω
    C1-6 (OUSN) - C4-11 (OUSN)
    		 Always
    		 Below 1 Ω
    C1-7 (TQG2) - C4-13 (TQG2)
    		 Always
    		 Below 1 Ω
    C1-8 (TQG1) - C4-6 (TQG1)
    		 Always
    		 Below 1 Ω
    C1-1 (INCS) - Body ground
    		 Always
    		 10 kΩ or higher
    C1-2 (INSN) - Body ground
    		 Always
    		 10 kΩ or higher
    C1-4 (TRQV) - Body ground
    		 Always
    		 10 kΩ or higher
    C1-5 (OUCS) - Body ground
    		 Always
    		 10 kΩ or higher
    C1-6 (OUSN) - Body ground
    		 Always
    		 10 kΩ or higher
    C1-7 (TQG2) - Body ground
    		 Always
    		 10 kΩ or higher
    C1-8 (TQG1) - Body ground
    		 Always
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2. INSPECT POWER STEERING GEAR ASSEMBLY (TORQUE SENSOR)

  1. C102953E04
    Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester connection
    (Symbols)
    		 Condition
    		 Specified condition
    C1-1 (INCS) - C1-7 (TQG2)
    		 Always
    		 90 to 170 Ω
    C1-2 (INSN) - C1-7 (TQG2)
    		 Always
    		 300 to 430 Ω
    C1-4 (TRQV) - C1-8 (TQG1)
    		 Always
    		 4 to 14 Ω
    C1-5 (OUCS) - C1-7 (TQG2)
    		 Always
    		 90 to 170 Ω
    C1-6 (OUSN) - C1-7 (TQG2)
    		 Always
    		 300 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 (Click here).



 NG
REPLACE POWER STEERING GEAR ASSEMBLY
OK


3. REPLACE POWER STEERING ECU ASSEMBLY

  1. Replace the power steering ECU assembly (Click here).


NEXT


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

  1. Initialize the rotation angle sensor value and calibrate the torque sensor zero point (Click here).


NEXT


5. RECONFIRM DTC

  1. Check for DTCs (Click here).

    Result:
    DTC Condition
    		 Proceed to
    DTC is not output
    		 A
    DTC C1511, C1512, or C1513 is output
    		 B

    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 (Click here).



 B
REPLACE POWER STEERING GEAR ASSEMBLY
A

END


← DIAGNOSTIC TROUBLE CODE CHARTC1515 →