C1581

POWER STEERING: POWER STEERING SYSTEM: C1581: Assist Map Number Un-Writing
C1581 - Assist Map Number Un-Writing

DESCRIPTION

The power steering ECU outputs this DTC when it determines that the assist map is not written in the ECU.





INSPECTION PROCEDURE

NOTICE:
If the steering column assembly or power steering ECU has been replaced, perform the rotation angle sensor initialization and torque sensor zero point calibration Programming and Relearning.

PROCEDURE

1. PERFORM ZERO POINT CALIBRATION

(a) Perform the zero point initialization and calibration Programming and Relearning.

HINT
Conducting torque sensor zero point calibration will cause the power steering ECU to enter test mode. When entering test mode, the power steering ECU will automatically perform assist map writing.

NEXT -- Continue to next step.

2. CHECK DTC OUTPUT

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

Result





B -- CHECK DTC (CAN COMMUNICATION SYSTEM)

A -- END (COMPLETION OF ASSIST MAP WRITING RETURNS SYSTEM TO NORMAL)

3. CHECK DTC (CAN COMMUNICATION SYSTEM)

(a) Check for DTCs of the CAN communication system Diagnosis System.

Result





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

4. CHECK BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)

(a) Check that the correct brake actuator assembly (skid control ECU) is installed.

OK:

The correct brake actuator assembly (skid control ECU) is installed.

NG -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal

OK -- REPLACE POWER STEERING ECU Removal