C1581

POWER STEERING: ELECTRONIC POWER STEERING SYSTEM: C1581: Assist Map Number Un-Writing

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).





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ASSIST MAP WRITING
(a) Turn the power 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 power 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.
NG -- CHECK CAN COMMUNICATION SYSTEM
OK -- END
2. CHECK CAN COMMUNICATION SYSTEM
(a) Using 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 HYBRID VEHICLE CONTROL ECU
(a) Check if the correct hybrid vehicle control ECU for the engine type and drivetrain of the vehicle is installed.
OK:
The correct hybrid vehicle control ECU is installed.
NG -- REPLACE HYBRID VEHICLE CONTROL ECU
OK -- Continue to next step.
4. CHECK MAIN BODY ECU (INSTRUMENT PANEL J/B)
(a) Check if the correct main body ECU (instrument panel J/B) for the model and grade of the vehicle is installed.
OK:
The correct main body ECU (instrument panel J/B).
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 MAIN BODY ECU (INSTRUMENT PANEL J/B)
OK -- REPLACE POWER STEERING ECU ASSEMBLY