C1581

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

DESCRIPTION

The power steering ECU outputs this DTC when it determines that the assist map is not written in the ECU.





INSPECTION PROCEDURE

NOTICE:
If the steering column assembly or power steering ECU has been replaced, perform the rotation angle sensor value initialization and torque sensor zero point calibration Programming and Relearning.

PROCEDURE

1. PERFORM ASSIST MAP WRITING

(a) Perform the assist map writing Programming and Relearning.

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result:





HINT
*1: Perform the assist map writing again if DTC C1581 is still output even after the assist map writing is performed once or twice.

C -- END

B -- PERFORM ASSIST MAP WRITING AGAIN Programming and Relearning
A -- Continue to next step.

3. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

(a) Check for DTCs Diagnosis System.

OK:

DTC is not output.

HINT
If the CAN communication system DTC is output, first troubleshoot the CAN communication system malfunction, then perform the assist map writing again Programming and Relearning.

NG -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
OK -- Continue to next step.

4. CHECK FOR DTC (HYBRID CONTROL SYSTEM)

(a) Check for DTCs Hybrid Control System.

OK:

DTC is not output.

HINT
If the hybrid control system DTC is output, first troubleshoot the hybrid control system, then perform the assist map writing again Programming and Relearning.

NG -- GO TO HYBRID CONTROL SYSTEM

OK -- REPLACE POWER STEERING ECU Removal