| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001B6N6 |
| Model Year Start: 2019 | Model: Avalon HV | Prod Date Range: [04/2018 - ] |
| Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM(for HV Model): C1581; Assist Map Number Un-Writing; 2019 - 2022 MY Avalon HV [04/2018 - ] | ||
|
DTC |
C1581 |
Assist Map Number Un-Writing |
DESCRIPTION
This DTC will be stored if the power steering ECU (rack and pinion power steering gear 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 (rack and pinion power steering gear 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 rack and pinion power steering gear assembly has been replaced, perform assist map writing and torque sensor zero point calibration.
Click here
![2019 - 2022 MY Avalon HV [04/2018 - ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM(for HV Model): CALIBRATION](/t3Portal/stylegraphics/info.gif)
HINT:
Related parts store information necessary for assist map writing.
Related Part:
- Hybrid vehicle control ECU
- Main body ECU (Multiplex network body ECU)
- Skid control ECU (Brake booster with master cylinder assembly)
PROCEDURE
|
1. |
PERFORM ASSIST MAP WRITING |
(a) Perform assist map writing.
Chassis > EMPS > Utility
|
Tester Display |
|---|
|
Signal Check |
(b) Check for DTCs.
Chassis > EMPS > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC C1581 is output. |
A |
|
DTC C1581 is not output. |
B |
| 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 |
|
|
|
3. |
CHECK RELATED PART |
(a) Confirm if the related part has the correct part number.
|
Related Part |
Hybrid vehicle control ECU |
|
Main body ECU (Multiplex network body ECU) |
|
|
Skid control ECU (Brake booster with master cylinder assembly) |
NOTICE:
When removing the related part to check it, be sure to follow the appropriate procedures and precautions.
-
Hybrid vehicle control ECU
Click here
-
Main body ECU (Multiplex network body ECU)
Click here
-
Skid control ECU (Brake booster with master cylinder assembly)
Click here
|
Result |
Proceed to |
|---|---|
|
The related part has the correct part number. |
A |
|
The related part has an incorrect part number. |
B |
| B |
|
|
|
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 (rack and pinion power steering gear 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 |
|
GO TO DIAGNOSTIC PROCEDURE INDICATED BY OUTPUT DTC |
| B |
|
REPLACE RACK AND PINION POWER STEERING GEAR 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.
-
Hybrid vehicle control ECU
Click here
-
Main body ECU (Multiplex network body ECU)
Click here
-
Skid control ECU (Brake booster with master cylinder assembly)
Click here
|
|
6. |
CHECK FOR DTC |
(a) Check for DTCs.
Chassis > EMPS > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTCs are not output. |
A |
|
DTCs are output. |
B |
| A |
|
END |
| B |
|
REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY
|
|
|