C1A71

CRUISE CONTROL: LANE-KEEPING ASSIST SYSTEM: C1A71: Power Steering Control Torque
C1A71 - Power Steering Control Torque

DESCRIPTION

When the lane departure warning function operates, the driving support ECU sends a signal to the power steering control ECU to operate the steering motor.





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM)

(a) Check for DTCs (CAN communication system) Reading and Clearing Diagnostic Trouble Codes.

OK:

CAN communication system DTC is not output.

NG -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
OK -- Continue to next step.

2. CHECK FOR DTC (POWER STEERING SYSTEM)

(a) Check for DTCs (power steering system) Reading and Clearing Diagnostic Trouble Codes.

OK:

Power steering system DTC is not output.

HINT
If DTC C1A71 is output even after troubleshooting the power steering system, replace the driving support ECU.

NG -- GO TO POWER STEERING SYSTEM Power Steering System
OK -- Continue to next step.

3. REPLACE POWER STEERING CONTROL ECU

(a) Replace the power steering control ECU Removal.

NEXT -- Continue to next step.

4. CHECK FOR DTC

(a) Using the Techstream, enter the following menus: All ECUs / Lane Keeping Assist / Trouble Codes.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Turn the power switch off.

(d) Turn the power switch on (IG).

(e) Drive the vehicle at a speed of 50 km/h (31 mph) or more, and operate lane keeping assist control.

(f) Recheck for DTCs.

OK:

DTC C1A71 is not output.

NG -- REPLACE DRIVING SUPPORT ECU Removal

OK -- END