Dtc C1581 Assist Map Number Un-Writing

Steering. Lexus Is250, Is220D. Gse20 Ale20
Power Steering. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

INSPECTION PROCEDURE

PERFORM ASSIST MAP WRITING

CHECK CAN COMMUNICATION SYSTEM

CHECK MULTIPLEX COMMUNICATION SYSTEM

CHECK ECM

CHECK GATEWAY ECU

DTC C1581 Assist Map Number Un-Writing


DESCRIPTION

The power steering ECU assembly outputs this DTC when it determines that the 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.
  1. ECM
  2. Gateway ECU
  3. 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:
    The 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
END
NG


2.CHECK CAN COMMUNICATION SYSTEM

  1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the CAN communication system.

    OK:
    DTCs are not output.


NG
GO TO CAN COMMUNICATION SYSTEM
OK


3.CHECK MULTIPLEX COMMUNICATION SYSTEM

  1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the multiplex communication system (BEAN).

    OK:
    DTCs are not output.


NG
GO TO MULTIPLEX COMMUNICATION SYSTEM
OK


4.CHECK ECM

  1. Check if a qualified ECM is installed.

    OK:
    A qualified ECM is installed.


NG
REPLACE ECM
OK


5.CHECK 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 value and calibrate the torque sensor zero point (Click here).


NG
REPLACE NETWORK GATEWAY ECU
OK

REPLACE POWER STEERING ECU ASSEMBLY