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 power switch is turned on (IG) 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
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
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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