Lexus NX: Precaution

PRECAUTION

TROUBLESHOOTING PRECAUTIONS

(a) When there is a malfunction with terminal contact points or part installation problems, removal and installation of the suspected problem parts may return the system to the normal condition either completely or temporarily.

(b) Before disconnecting a connector or removing and installing a component in order to narrow down the malfunctioning part, make sure to perform the following procedure.

NOTICE:

When disconnecting a connector or removing a fuse or relay, make sure that the power switch is off, the brake pedal is not depressed, and the driver door has been closed for 2 minutes or more*.

*: Differs according to vehicle conditions

(c) Since the system may be influenced by malfunctions in systems other than the brake control system, be sure to check for DTCs in other systems.

HANDLING PRECAUTIONS

(a) Do not remove or install electronically controlled brake system parts such as the steering sensor, yaw rate and acceleration sensor (airbag ECU assembly) or brake pedal stroke sensor assembly except when required, as they need to be adjusted correctly after removal and installation.

(b) Be sure to perform preparation before work and confirmation after work is completed by following the directions in the repair manual when working on the electronically controlled brake system.

(c) Be sure that the power switch is off when removing and installing the ECU, actuator, sensors, etc. unless it is otherwise specified in the inspection procedure.

(d) If the brake booster with master cylinder assembly or a sensor has been removed and installed, it is necessary to check the system for problems after the parts have been reassembled. Check for DTCs using the Techstream. Also check that the system functions and signals received by the ECU are normal using Test Mode.

(e) If the brake pedal is depressed before the brake control system is prepared to operate, the pedal stroke may seem unusually long or short. This is due to the fact the stroke simulator cut solenoid has not yet operated and is not a malfunction.

After the power switch is turned on (IG) or the brake pedal is depressed twice or more, the stroke simulator will operate and the brake pedal stroke will remain consistent.

DTC PRECAUTION

(a) Warnings for some DTCs cannot be cleared by only repairing the malfunctioning parts. If the warning is displayed even after repair work, the DTC should be cleared after turning the power switch off.

NOTICE:

If a DTC for a malfunctioning part reappears after it is cleared, then it has been stored again.

(b) When 2 or more DTCs are detected, perform circuit inspections one by one until the problem is identified.

CHASSIS DYNAMOMETER PRECAUTION

(a) Enter Inspection Mode to disable TRAC and VSC operation when using a chassis dynamometer.

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CAN COMMUNICATION SYSTEM PRECAUTIONS

(a) The CAN communication system is used for communication between the skid control ECU (brake booster with master cylinder assembly), steering sensor, yaw rate and acceleration sensor (airbag ECU assembly) and other ECUs. If there is trouble in the CAN communication line, corresponding DTCs in the communication line are output.

(b) If any CAN communication DTCs are output, repair the malfunction, then troubleshoot the VSC system while communication is normal.

(c) In order to enable CAN communication, a specific type of wiring is used for the CAN communication lines. The wiring used for each communication line is a twisted pair of wires that have an equal length. A bypass wire should not be used, because the data being transmitted will be corrupted.

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