DTC    C1541    Vehicle Speed Signal Malfunction

for Preparation Click here


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 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

NOTICE:
If the steering column assembly or power steering ECU assembly has been replaced, perform rotation angle sensor value initialization and torque sensor zero point calibration (Click here).

1.CHECK OTHER DTC OUTPUT (CAN COMMUNICATION SYSTEM)

  1. Check if DTC U0129 is output (Click here).

    Result:
    Result
    		Proceed to
    U0129 is not output
    		A
    U0129 is output
    		B

    HINT:
    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:
    Electronically controlled brake system DTCs are not output.

    NOTICE:
    If replacing the power steering ECU assembly, initialize the rotation angle sensor value 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 ASSEMBLY (Click here)