C1581

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for 2ZR-FE): C1581: Assist Map Number Un-Writing
C1581 - Assist Map Number Un-Writing

DESCRIPTION

DTC C1581 will be stored if the power steering ECU determines that the assist map is not written in the ECU.





INSPECTION PROCEDURE

NOTICE:
If the power steering ECU has been replaced with a new one, perform the assist map writing and the 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 Reading and Clearing Diagnostic Trouble Codes.

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 (SFI SYSTEM)

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

OK:

DTC is not output.

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

NG -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS SFI System

OK -- REPLACE POWER STEERING ECU Removal