C1541

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

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 driving at a speed of 100 km/h (62 mph) and continues the system control.






INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM)
(a) Check if DTC U0073 or U0129 is output.
Result:





HINT:
- DTC U0073 indicates a CAN communication malfunction in the electronic power steering system.
- DTC U0129 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 DTC OUTPUT (BREAK CONTROL SYSTEM)
(a) Check for DTCs of the ABS 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