C1541

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 brake actuator assembly (skid control ECU) via CAN communication. The ECU provides appropriate assisting force in accordance with the vehicle speed based on these signals.

If the ECU stores this DTC, it adjusts the amount of power assist to that used for a speed of 100 km/h (62 mph) and continues system control.





INSPECTION PROCEDURE

NOTICE:
If the power steering ECU has been replaced with a new one, perform rotation angle sensor initialization and torque sensor zero point calibration Programming and Relearning.

PROCEDURE

1. CHECK FOR OTHER DTC OUTPUT (CAN COMMUNICATION SYSTEM)

(a) Check if DTC U0129 is output Reading and Clearing Diagnostic Trouble Codes.

Result:





HINT
DTC U0129 indicates a brake actuator assembly (skid control ECU) communication malfunction in the power steering system.

B -- GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH
TROUBLESHOOTING) How to Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK FOR OTHER DTC OUTPUT (VEHICLE STABILITY CONTROL SYSTEM)

(a) Using the Techstream, check for DTCs and confirm that there are no problems in the vehicle stability control system Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- GO TO VEHICLE STABILITY CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Vehicle Stability Control System

A -- REPLACE POWER STEERING ECU ASSEMBLY Removal