Lexus ES: Assist Map Number Mismatch (C1582)
DESCRIPTION
When an incorrect hybrid vehicle control ECU or skid control ECU (brake booster with master cylinder assembly) is installed after the assist map has been written to the power steering ECU (rack and pinion power steering gear assembly), DTC C1582 is stored because the information stored in the power steering ECU (rack and pinion power steering gear assembly) does not match the vehicle specifications.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Return-to-normal Condition | Note |
|---|---|---|---|---|---|---|
| C1582 | Assist Map Number Mismatch | Assist map number mismatch |
| EPS warning light: Does not come 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. | CHECK CAN COMMUNICATION SYSTEM |
(a) Check for DTCs.
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| Result | Proceed to |
|---|---|
| CAN communication system DTCs are not output. | A |
| CAN communication system DTCs are output. | B |
| B | .gif) | GO TO CAN COMMUNICATION SYSTEM |
|
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| 2. | CHECK RELATED PART |
(a) Check if the part below has been replaced with an incorrect part in the past.
| 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
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-
Skid control ECU (Brake booster with master cylinder assembly)
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(b) When DTC C1582 is output and parts have not been exchanged, replace the power steering ECU (rack and pinion power steering gear assembly) as it may have an internal malfunction.
NOTICE:
If the rack and pinion power steering gear assembly has been replaced, perform assist map writing.
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| Result | Proceed to |
|---|---|
| The related part has an incorrect part number. | A |
| The related part has the correct part number, or a related part and rack and pinion power steering gear assembly have not been replaced. | B |
| B | | REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY |
|
| 3. | 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
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-
Skid control ECU (Brake booster with master cylinder assembly)
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|
| 4. | 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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