C1581

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

DESCRIPTION

This DTC is output when one of the following occurs: 1) the power steering ECU selects assist map according to the vehicle specifications from the suspension control ECU, but the assist map is not written in the power steering ECU, or 2) the power steering ECU determines that the vehicle specifications and the assist map are inconsistent.





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.

Result





B -- END
A -- 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 Diagnosis System.

Result





B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

3. CHECK SUSPENSION CONTROL ECU

(a) Check if a suspension control ECU that complies with the vehicle's specifications is installed.

OK:

Suspension control ECU that complies with vehicle's specifications is installed.

NOTICE:
If replacing the power steering ECU, initialize the rotation angle sensor value and calibrate the torque sensor zero point Power Steering System.

NG -- REPLACE SUSPENSION CONTROL ECU Removal

OK -- REPLACE POWER STEERING ECU Removal