DESCRIPTION
This DTC will be stored if the power steering ECU assembly determines that the assist map is not written in the ECU.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Warning Indicate |
Return-to-normal Condition |
Note |
---|---|---|---|---|---|---|
C1581 |
Assist Map Number Un-Writing |
Assist map not written in power steering ECU assembly |
|
EPS warning light: Comes on |
Assist Map Writing is performed or the ignition switch is turned ON again |
- |
CAUTION / NOTICE / HINT
NOTICE:
If the power steering ECU assembly has been replaced, perform assist map writing and torque sensor zero point calibration.
Click here
HINT:
Related parts store information necessary for assist map writing.
Related Part:
PROCEDURE
1. |
PERFORM ASSIST MAP WRITING |
(a) Perform assist map writing.
Click here
Tester Display |
---|
Signal Check |
(b) Check for DTCs.
Click here
Result |
Proceed to |
---|---|
DTC C1581 is output. |
A |
DTC C1581 is not output. |
B |
NOTICE:
DTC C1581 is cleared after the assist map is written.
B | ![]() |
END |
|
2. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Check for DTCs.
Click here
Result |
Proceed to |
---|---|
CAN communication system DTCs are not output. |
A |
CAN communication system DTCs are output. |
B |
B | ![]() |
GO TO CAN COMMUNICATION SYSTEM
|
|
3. |
CHECK RELATED PART |
(a) Confirm if the related part has the correct part number.
Related Part |
ECM |
Main body ECU (Multiplex network body ECU) |
|
Skid control ECU (Brake actuator assembly) |
NOTICE:
When removing the related part to check it, be sure to follow the appropriate procedures and precautions.
Click here
Click here
Result |
Proceed to |
---|---|
The related part has the correct part number. |
A |
The related part has an incorrect part number. |
B |
B | ![]() |
GO TO STEP 5 |
|
4. |
CHECK FOR DTC |
(a) Select Health Check on the Techstream screen and check if system DTCs of the related part are output.
HINT:
If system DTCs of the related part are stored, assist map writing to the power steering ECU assembly may not be performed properly.
Result |
Proceed to |
---|---|
System DTCs of the related part are output. |
A |
System DTCs of the related part are not output. |
B |
A | ![]() |
REPAIR CIRCUIT INDICATED BY OUTPUT CODE |
B | ![]() |
REPLACE POWER STEERING ECU ASSEMBLY |
5. |
REPLACE RELATED PART WITH PART THAT HAS CORRECT PART NUMBER |
(a) Replace the related part with one that has the correct part number.
Click here
Click here
|
6. |
CHECK FOR DTC |
(a) Check for DTCs.
Click here
Result |
Proceed to |
---|---|
DTCs are not output. |
A |
DTCs are output. |
B |
A | ![]() |
END |
B | ![]() |
REPLACE POWER STEERING ECU ASSEMBLY |
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