Lexus ES: Assist Map Number Un-Writing (C1581)
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 | - |
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 .gif)
HINT:
Related parts store information necessary for assist map writing.
Related Part:
- ECM
- Skid control ECU (Brake actuator assembly)
- AVS ECU (Absorber control ECU) (w/ Adaptive Variable Suspension System)
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 | .gif) | END |
|
.gif)
| 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 |
| Skid control ECU (Brake actuator assembly) | |
| AVS ECU (Absorber control ECU) (w/ Adaptive Variable Suspension System) |
NOTICE:
When removing the related part to check it, be sure to follow the appropriate procedures and precautions.
-
ECM
for 2GR-FKS: Click here
for A25A-FKS: Click here
-
Skid control ECU (Brake actuator assembly)
Click here
-
AVS ECU (Absorber control ECU) (w/ Adaptive Variable Suspension System)
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 (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 | | REPAIR CIRCUIT INDICATED BY OUTPUT CODE |
| 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.
-
ECM
for 2GR-FKS: Click here
for A25A-FKS: Click here
-
Skid control ECU (Brake actuator assembly)
Click here
-
AVS ECU (Absorber control ECU) (w/ Adaptive Variable Suspension System)
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 |
READ NEXT:
Assist Map Number Mismatch (C1582)
DESCRIPTION When an incorrect ECM, skid control ECU (brake actuator assembly) or AVS ECU (Absorber control ECU) (w/ Adaptive Variable Suspension System) is installed after the assist map has been writ
Assist Map Number Mismatch (C1582)
DESCRIPTION When an incorrect ECM, skid control ECU (brake actuator assembly) or AVS ECU (Absorber control ECU) (w/ Adaptive Variable Suspension System) is installed after the assist map has been writ
Lost Communication with ECM / PCM "A" (U0100,U0126,U0129,U0132,U023A)
DESCRIPTION The power steering ECU (rack and pinion power steering gear assembly) receives signals from the ECM, steering sensor, skid control ECU (brake actuator assembly), AVS ECU (absorber control
SEE MORE:
Rear Power Window RH Auto Up / Down Function does not Operate with Rear Power Window Switch RH
DESCRIPTION If the manual up and down functions operate normally but the auto up and down functions do not, the power window control system may be in fail-safe mode. If power window initialization has not been performed, the auto up and down functions will not operate. Click here WIRING DIAGRAM C
Drive Motor Inverter Temperature Sensor "A" Circuit Voltage Out of Range (P0AED1C)
DTC SUMMARY MALFUNCTION DESCRIPTION These DTCs indicate that the motor inverter temperature sensor value is abnormal. The cause of this malfunction may be one of the following: Internal inverter malfunction
Inverter with converter assembly internal circuit malfunction
Hybrid cooling system ma
