Dtc C1541 Vehicle Speed Signal Malfunction

Steering. Lexus Is250, Is220D. Gse20 Ale20
Power Steering. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC OUTPUT

CHECK DTC OUTPUT

DTC C1541 Vehicle Speed Signal Malfunction


DESCRIPTION

The power steering ECU assembly receives vehicle speed signals from the skid control ECU via CAN communication. The ECU provides appropriate assisting force in accordance with the vehicle speed, based on the signals.
If the ECU detects this DTC, it adjusts the amount of power assistance for a speed of 100 km/h (62 mph) and continues the system control.

DTC No.
DTC Detection Condition
Trouble Area
C1541
This DTC is detected when vehicle speed signals via CAN communication are cut off for 3 seconds or more.
  1. Speed sensor circuit
  2. Skid control ECU
  3. CAN communication system
  4. Power steering ECU assembly

INSPECTION PROCEDURE

1.CHECK DTC OUTPUT

  1. Check if DTC U0121 is output.

    Result:
    DTC Condition
    		Proceed to
    DTC is not output
    		A
    DTC U0121 is output
    		B
    HINT:
    DTC U0121 indicates a skid control ECU communication malfunction in the electronic power steering system.


B
GO TO CAN COMMUNICATION SYSTEM
A


2.CHECK DTC OUTPUT

  1. Check for DTCs of the ABS & VSC system.

    Result:
    DTC Condition
    		Proceed to
    DTC is not output
    		A
    DTC C0200, C0205, C0210, C0215, C1235, C1236, C1238, or C1239 is output
    		B
    HINT:
    These DTCs indicate a speed sensor signal malfunction in the VSC system (Click here).
    NOTICE:
    If replacing the power steering ECU assembly, initialize the rotation angle sensor value and calibrate the torque sensor zero point (Click here).


B
GO TO BRAKE CONTROL SYSTEM (SPEED SENSOR CIRCUIT)
A

REPLACE POWER STEERING ECU ASSEMBLY