POWER STEERING SYSTEM, Diagnostic DTC:C1541

DTC Code DTC Name
C1541 Vehicle Speed Signal Malfunction

DESCRIPTION

The power steering ECU receives vehicle speed signals from the brake actuator assembly (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.

  • Speed sensor circuit

  • Brake actuator assembly (Skid control ECU)

  • CAN communication system

  • Power steering ECU

INSPECTION PROCEDURE

Note

If the power steering ECU has been replaced with a new one, perform the rotation angle sensor initialization and torque sensor zero point calibration Click here.

PROCEDURE


  1. CHECK OTHER DTC OUTPUT (CAN COMMUNICATION SYSTEM)


    1. Check if DTC U0129 is output Click here.

      Result
      Result Proceed to
      DTC U0129 is not output. A
      DTC U0129 is output. B

      Tech Tips

      DTC U0129 indicates an skid control ECU communication malfunction in the power steering system.


    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK OTHER DTC OUTPUT (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)


    1. Using the intelligent tester, check for DTCs and confirm that there are no malfunctions in the electronically controlled brake system Click here.

      Result
      Result Proceed to
      DTC is not output. A
      DTC is output. B

    B

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE Click here

    A

    REPLACE POWER STEERING ECU Click here