Lexus NX: Vehicle Speed Signal (C1541)
DESCRIPTION
The power steering ECU assembly receives vehicle speed signals from the skid control ECU (brake booster with master cylinder assembly) via CAN communication. The ECU provides appropriate assisting force in accordance with the vehicle speed based on the signals.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Return-to-normal Condition | Note |
|---|---|---|---|---|---|---|
| C1541 | Vehicle Speed Signal | Vehicle speed signals via CAN communication are cut off for 3 seconds or more. |
| On | After normal confirmation | - |
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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PROCEDURE
| 1. | CHECK OTHER DTC OUTPUT (CAN COMMUNICATION SYSTEM) |
(a) Check if DTC U0129 is output.
Click here
| U0129 is output | .gif) | GO TO CAN COMMUNICATION (HOW TO PROCEED WITH TROUBLESHOOTING) |
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| 2. | CHECK OTHER DTC OUTPUT (BRAKE CONTROL SYSTEM) |
(a) Check for brake control system DTCs.
Click here
| DTCs are not output. | | REPLACE POWER STEERING ECU ASSEMBLY |
| DTCs are output. | | GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) |
READ NEXT:
IG Power Supply Voltage (C1551)
DESCRIPTION The power steering ECU assembly distinguishes the power switch status as on (IG) or off through the IG power source circuit. DTC No. Detection Item DTC Detection Condition Trouble
PIG Power Supply Voltage (C1552,C1554)
DESCRIPTION When a problem occurs in the power steering system, the power source relay circuit is shut off to stop the power assist. DTC No. Detection Item DTC Detection Condition Trouble Are
Error in Matching of ECUs (C1567)
DESCRIPTION Based on the ECM signal, the power steering ECU assembly determines if the correct type of ECM is installed. DTC No. Detection Item DTC Detection Condition Trouble Area Warning
SEE MORE:
Parts Location
PARTS LOCATION ILLUSTRATION *1 COMBINATION METER ASSEMBLY *2 CLIMATE CONTROL SWITCH (for Driver Side) *3 CLIMATE CONTROL SWITCH (for Front Passenger Side) *4 AIR CONDITIONING CONTROL ASSEMBLY *5 AIR CONDITIONING AMPLIFIER ASSEMBLY *6 DLC3 *7 INSTRUMENT PANEL JUNCT
System Diagram
SYSTEM DIAGRAM Communication Table Transmitting ECU Receiving ECU Signal Communication Method Main body ECU (multiplex network body ECU) Multiplex network door ECU
Combination switch assembly signal
Back door opener switch assembly signal
Power back door ON/OFF signal
