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 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.
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HINT:
Related parts store information necessary for assist map writing.
Related Part:
- Hybrid vehicle control 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 | .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 | Hybrid vehicle control 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
-
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 | | 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 | | 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
-
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 |
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