DTC    C1581    Assist Map Number Un-Writing

for Preparation Click here


DESCRIPTION

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

HINT:
The assist map is data written in the power steering ECU assembly to control the degree of assistance. The assist map is selected based on the vehicle's specified communication data (designation and grade package information).

DTC No.
DTC Detection Item
Trouble Area
C1581
Assist map is not written in the power steering ECU assembly.
Power steering ECU assembly


INSPECTION PROCEDURE

1.PERFORM ASSIST MAP WRITING

  1. Turn the engine switch on (IG), and wait for 30 seconds or more.

    HINT:
    Assist map is automatically written when approximately 30 seconds have elapsed after the engine switch is turned on (IG). DTC C1581 will be cleared after the assist map is written.

  1. Check for DTCs.

    OK:
    DTC C1581 is not output.



OK
RETURN TO NORMAL
NG


2.CHECK CAN COMMUNICATION SYSTEM

  1. Check for DTCs of the CAN communication system (Click here).

    OK:
    DTCs are not output.



NG
REPAIR CIRCUIT INDICATED BY OUTPUT CODE
OK


3.CHECK MULTIPLEX COMMUNICATION SYSTEM

  1. Check for DTCs in the multiplex communication system (Click here).

    OK:
    DTCs are not output.



NG
REPAIR CIRCUIT INDICATED BY OUTPUT CODE
OK


4.CHECK ECM

  1. Check if a qualified ECM is installed.

    OK:
    A qualified ECM is installed.

    NOTICE:
    Perform the RESET MEMORY (AT initialization) procedures if replacing the ECM (Click here for A761E, Click here for A960E, Click here for A760E).



NG
REPLACE ECM
OK


5.CHECK NETWORK GATEWAY ECU

  1. Check if a qualified network gateway ECU is installed.

    OK:
    A qualified network gateway ECU is installed.

    NOTICE:
    If replacing the power steering ECU assembly, initialize the rotation angle sensor and calibrate the torque sensor zero point (Click here).



NG
REPLACE NETWORK GATEWAY ECU
OK

REPLACE POWER STEERING ECU ASSEMBLY