Vehicle Speed Signal Malfunction

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





INSPECTION PROCEDURE

NOTICE:
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 Programming and Relearning.

PROCEDURE

1. CHECK OTHER DTC OUTPUT (CAN COMMUNICATION SYSTEM)

(a) Check if DTC U0129 is output.

Result:





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

B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

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

(a) Check for DTCs of the electronically controlled brake system Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC of speed sensor malfunction is not output.

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

NG -- REPAIR CIRCUIT INDICATED BY OUTPUT CODE (for Electronically Controlled Brake System) Electronically Controlled Brake System

OK -- REPLACE POWER STEERING ECU Removal