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.

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.	ECM Gateway ECU Power steering ECU assembly

1.PERFORM ASSIST MAP WRITING

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

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.

Check for DTCs.

OK

END

NG

2.CHECK CAN COMMUNICATION SYSTEM

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

NG

GO TO CAN COMMUNICATION SYSTEM

OK

3.CHECK MULTIPLEX COMMUNICATION SYSTEM

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

NG

GO TO MULTIPLEX COMMUNICATION SYSTEM

OK

4.CHECK ECM

Check if a qualified ECM is installed.

NG

REPLACE ECM

OK

5.CHECK GATEWAY ECU

Check if a qualified network gateway ECU is installed.

If replacing the power steering ECU assembly, initialize the rotation angle sensor value and calibrate the torque sensor zero point .

NG

REPLACE NETWORK GATEWAY ECU

OK

REPLACE POWER STEERING ECU ASSEMBLY

LEXUS IS250, IS220d / GSE20 ALE20