C1581

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1581: Assist Map Number Un-Writing

DTC C1581 - Assist Map Number Un-Writing

DESCRIPTION

The power steering ECU stores 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 to control the degree of assistance. The assist map is selected based on the vehicle's specified communication data.





INSPECTION PROCEDURE

PROCEDURE

1. INITIALIZE ROTATION ANGLE SENSOR AND CALIBRATE TORQUE SENSOR ZERO POINT
(a) Initialize the rotation angle sensor value and calibrate the torque sensor zero point Programming and Relearning.
HINT: The assist map is automatically written during the rotation angle sensor initialization and torque sensor zero point calibration.

NEXT -- Continue to next step.

2. CHECK FOR DTC
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC C1581 is not output.
HINT: DTC C1581 will be cleared after the assist map is written.

NG -- CHECK FOR DTC (CAN COMMUNICATION SYSTEM)
OK -- END
3. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)
(a) Using the Techstream, check for DTCs and confirm that there are no problems in the CAN communication system Diagnosis System.
OK:
DTC is not output.

NG -- GO TO CAN COMMUNICATION SYSTEM
OK -- Continue to next step.

4. CHECK ECM
(a) Check if an ECM that complies with the vehicle specifications is installed.
OK:
ECM that complies with vehicle specifications is installed.

Result





C -- REPLACE ECM
B -- REPLACE ECM
A -- Continue to next step.

5. CHECK BRAKE ACTUATOR ASSEMBLY
(a) Check if a brake actuator assembly (skid control ECU) that complies with the vehicle specifications is installed.
OK:
Brake actuator assembly (skid control ECU) that complies with vehicle specifications is installed.

NG -- REPLACE BRAKE ACTUATOR ASSEMBLY
OK -- REPLACE POWER STEERING ECU