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 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

  • Skid control ECU

  • CAN communication system

  • Power steering ECU

INSPECTION PROCEDURE

Note

If the steering column assembly or power steering ECU has been replaced, perform the rotation angle sensor value 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
      No output A
      U0129 is output B

      Tech Tips

      DTC U0129 indicates a 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. Check for DTCs of the electronically controlled brake system Click here.

      OK
      DTC of speed sensor malfunction is not output.

      Note

      If replacing the power steering ECU, initialize the rotation angle sensor and calibrate the torque sensor zero point Click here.


    NG

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE (for Electronically Controlled Brake System) Click here

    OK

    REPLACE POWER STEERING ECU Click here