Lexus NX: Assist Map Number Un-Writing (C1581)
DESCRIPTION
This DTC will be stored if the power steering ECU 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 assembly |
| On | Assist map written | - |
CAUTION / NOTICE / HINT
NOTICE:
-
If the power steering ECU assembly has been replaced, perform assist map writing and torque sensor zero point calibration.
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-
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.
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PROCEDURE
| 1. | PERFORM ASSIST MAP WRITING |
(a) Perform the assist map writing.
Click here
| Tester Display |
|---|
| Signal Check |
(b) Check for DTCs.
Click here
NOTICE:
DTC C1581 is cleared after the assist map is written.
| DTC C1581 is not output. | .gif) | END |
|
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| 2. | CHECK CAN COMMUNICATION SYSTEM |
(a) Check for DTCs.
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| CAN communication system DTC is output. | | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
|
| 3. | CHECK RELATED PART |
(a) Check if any of the parts listed below have been replaced with an incorrect part in the past.
| 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 a related part to check it, be sure to follow the appropriate procedures and precautions.
-
Hybrid vehicle control ECU
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-
Main body ECU (multiplex network body ECU)
Click here
-
Skid control ECU (brake booster with master cylinder assembly)
Click here
HINT:
When DTC C1581 is output when parts have not been exchanged, replace the power steering ECU assembly as it may have an internal malfunction.
| All installed related parts have correct part number | | REPLACE POWER STEERING ECU ASSEMBLY |
| Part with incorrect part number is installed | | REPLACE RELATED PART WITH PART THAT HAS CORRECT PART NUMBER |
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