C1581

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





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ASSIST MAP WRITING

(a) 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.

(b) Check for DTCs.

OK:

DTC C1581 is not output.

OK -- END
NG -- Continue to next step.

2. CHECK CAN COMMUNICATION SYSTEM

(a) Using the Techstream, 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 -- Continue to next step.

3. CHECK MULTIPLEX COMMUNICATION SYSTEM

(a) Using the Techstream, 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 -- Continue to next step.

4. CHECK ECM

(a) Check if correct ECM for the engine type and drivetrain of the vehicle is installed.

OK:

The correct ECM is installed.

NG -- REPLACE ECM
OK -- Continue to next step.

5. CHECK NETWORK GATEWAY ECU

(a) Check if the correct network gateway ECU for the model and grade of the vehicle is installed.

OK:

The correct 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 Programming and Relearning.

NG -- REPLACE NETWORK GATEWAY ECU

OK -- REPLACE POWER STEERING ECU ASSEMBLY