C1581

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1581: Assist Map Number Un-Writing
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 engine switch on (IG), and wait at least 40 seconds.

HINT
The assist map is automatically written when approximately 40 seconds have elapsed after the engine 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 the Techstream, check for DTCs and confirm that there are no problems in the CAN communication system Diagnosis System.

OK:

DTCs are not output.

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

3. CHECK MULTIPLEX COMMUNICATION SYSTEM

(a) Using the Techstream, check for DTCs and confirm that there are no problems in the multiplex communication system Multiplex Communication System.

OK:

DTCs are not output.

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

4. CHECK ECM

(a) Check if the correct ECM is installed.

OK:

The correct ECM is installed.

Result:





C -- REPLACE ECM (4GR-FSE) Removal

B -- REPLACE ECM (2GR-FSE) Removal
A -- Continue to next step.

5. CHECK GATEWAY ECU

(a) Check if the correct gateway ECU is installed.

OK:

The correct gateway ECU is installed.

NOTICE:
If replacing the power steering ECU assembly assembly, initialize the rotation angle sensor value and calibrate the torque sensor zero point Programming and Relearning.

NG -- REPLACE GATEWAY ECU Removal

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal