C1581

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.	ECM Gateway ECU 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.

2. 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