C1541

POWER STEERING: POWER STEERING SYSTEM: C1541: Vehicle Speed Signal Malfunction
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.





INSPECTION PROCEDURE

PROCEDURE

1. CHECK OTHER DTC OUTPUT

(a) Check if DTC U0121 is output.

Result:





HINT
DTC U0121 indicates a skid control ECU communication malfunction in the electronic power steering system.

B -- GO TO CAN COMMUNICATION SYSTEM
A -- Continue to next step.

2. CHECK OTHER DTC OUTPUT

(a) Check for DTCs of the ABS & VSC system.

Result:





NOTICE:
If replacing the power steering ECU assembly, initialize the rotation angle sensor value and calibrate the torque sensor zero point Programming and Relearning.

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

A -- REPLACE POWER STEERING ECU ASSEMBLY