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 |
|---|---|---|---|---|---|
| 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.
Click here
.gif)
-
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.
Click here
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 |
|
.gif)
| 2. | CHECK CAN COMMUNICATION SYSTEM |
(a) Check for DTCs.
Click here
| 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
Click here
-
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 |
READ NEXT:
Assist Map Number Mismatch (C1582)
DESCRIPTION When an incorrect hybrid vehicle control ECU, an incorrect Skid control ECU or an incorrect main body ECU is installed after the assist map has been written in the power steering ECU assem
Lost Communication with Brake System Control Module (U0129,U0293,U1104)
DESCRIPTION The power steering ECU assembly receives signals from the hybrid vehicle control ECU, skid control ECU(brake booster with master cylinder assembly) and forward recognition camera via the C
Power Steering Warning Light Circuit
DESCRIPTION The power steering ECU is connected to the combination meter via CAN communication. If any of the following conditions are detected, the power steering warning light remains on.
The cir
SEE MORE:
Components
COMPONENTS ILLUSTRATION *1 DECK FLOOR BOX LH *2 NO. 3 DECK BOARD SUB-ASSEMBLY *3 REAR DECK FLOOR BOX *4 AUXILIARY BATTERY NEGATIVE TERMINAL N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *1 FRONT AIRBAG SENSOR LH - - N*m (kgf*cm, ft.*lbf):
Installation
INSTALLATION PROCEDURE 1. INSTALL EXHAUST PIPE DAMPER (a) Install the exhaust pipe damper with the 2 bolts. Torque: 19 N·m {194 kgf·cm, 14 ft·lbf} 2. INSTALL HEATED OXYGEN SENSOR Click here 3. INSTALL FRONT EXHAUST PIPE ASSEMBLY (a) Using a vernier caliper, measure the free length of the co
