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 |
|
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| 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 |
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Precaution
PRECAUTION WHEN USING TECHSTREAM CAUTION: Observe the following items for safety reasons:
Before using the Techstream, read the instruction manual.
Prevent the Techstream cable from being caught on the pedals, shift lever or steering wheel when driving with the Techstream connected to the vehic
Initialization
INITIALIZATION NOTICE:
Initialization can be confirmed through the tire pressure warning light.
If the engine switch is turned off during initialization, the tire pressure warning ECU and receiver memorizes that initialization was being performed. Therefore, it is not necessary to perform the i
