Toyota 4Runner: Vehicle Speed Signal (C1541)

Toyota 4Runner Service Manual / Steering / Power Assist Systems / Power Steering System / Vehicle Speed Signal (C1541)

DESCRIPTION

The power steering ECU assembly receives vehicle speed signals from the master cylinder solenoid (skid control ECU) via CAN communication. The power steering ECU assembly provides appropriate assisting force in accordance with the vehicle speed signal.

DTC Code	DTC Detection Condition	Trouble Area
C1541	An abnormal vehicle speed signal is received.	Speed sensor circuit Vehicle stability control system CAN communication system Power steering ECU assembly

PROCEDURE

1.	CHECK OTHER DTC OUTPUT (CAN COMMUNICATION SYSTEM)

(a) Check if DTC U0129 is output (See page ).

Result

Result	Proceed to
DTC U0129 is not output.	A
DTC U0129 is output.	B

HINT:

DTC U0129 indicates a CAN communication malfunction in the power steering system.

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

2.	CHECK 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 (See page ).

Result

Result	Proceed to
DTC is not output.	A
DTC is output.	B

REPLACE POWER STEERING ECU ASSEMBLY

GO TO VEHICLE STABILITY CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART)

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