Lexus IS250 IS220d GSE20 ALE20 - POWER STEERING

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 ConditionTrouble Area
C1541This DTC is detected when vehicle speed signals via CAN communication are cut off for 3 seconds or more.
Speed sensor circuit
Skid control ECU
CAN communication system
Power steering ECU assembly

INSPECTION PROCEDURE

1.CHECK DTC OUTPUT

Check if DTC U0121 is output.

  • Result:
  • DTC ConditionProceed to
    DTC is not outputA
    DTC U0121 is outputB
  • 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

Check for DTCs of the ABS & VSC system.

  • Result:
  • DTC ConditionProceed to
    DTC is not outputA
    DTC C0200, C0205, C0210, C0215, C1235, C1236, C1238, or C1239 is outputB
  • HINT:
  • These DTCs indicate a speed sensor signal malfunction in the VSC system .
  • NOTICE:
  • If replacing the power steering ECU assembly, initialize the rotation angle sensor value and calibrate the torque sensor zero point .
B
GO TO BRAKE CONTROL SYSTEM (SPEED SENSOR CIRCUIT)
A
REPLACE POWER STEERING ECU ASSEMBLY
LEXUS IS250, IS220d / GSE20 ALE20
POWER STEERING
Lexus IS250 IS220d GSE20 ALE20
ELECTRONIC POWER STEERING SYSTEM