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Home >> Nissan-Datsun >> 2010 >> Altima L4-2.5L (QR25DE) Hybrid >> Repair and Diagnosis >> Brakes and Traction Control >> Antilock Brakes / Traction Control Systems >> Service Precautions >> Vehicle Damage Warnings >> Electronically Controlled Brake System

Electronically Controlled Brake System





PRECAUTIONS


Electronically Controlled Brake System


CAUTION:
When disconnecting the negative battery terminal, initialize the following system after the terminal is reconnected:






TROUBLESHOOTING PRECAUTIONS
1. 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.
2. In order to determine the malfunctioning area, be sure to check the conditions at the time the malfunction occurred, such as DTC output and the Freeze Frame Data, and record it before disconnecting each connector or removing and installing parts.
3. Since the system may be influenced by malfunctions in systems other than the brake control system, be sure to check for DTCs in order systems.

HANDLING PRECAUTIONS
1. Do not remove or install Electronically Controlled Brake parts such as the steering angle sensor, yaw rate/side/decel G sensor or brake stroke sensor except when required, as they cannot be adjusted correctly after removal or installation.
2. Be sure to perform preparation before work and confirmation after work is completed by following the direction in the repair manual when working on the Electronically Controlled Brake system.
3. Be sure to remove and install the ECU, actuator, each sensor, etc. with the ignition switch OFF unless it is not specified in the inspection procedure.
4. Be sure to remove the 2 main relays before removal and installation, or replacement of the Electronically
Controlled Brake parts.
5. The removal or installation of the actuator, master cylinder or stroke simulator as well as some other procedures can cause the fluid level to drop below the fluid reservoir port. If this happens when performing such work, be sure to remove the 2 motor relays until the bleeding of the air in the pipeline is completed.

NOTE:
- When the pump motor is operated with the air in the brake actuator hose, bleeding the air becomes difficult due to air in the actuator.
- The brake ECU may operate the stroke simulator and drive the pump motor even when the ignition switch OFF.
- With the ignition switch OFF, the brake ECU can be operated for 2 minutes after the brake operation is finished.
6. Removal of the main relay and motor relay.
a. Wait for 2 minutes after turning the ignition switch OFF, stopping the brake pedal operation and closing the driver door before removing the 2 relays.

NOTE:
The above situation occurs when the pump motor operates to prepare for the next operation just before the brake control system turns OFF.
7. If the ECU, brake actuator, 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 CONSULT-III, also check that system functions and signals received by the ECU are normal using Test Mode.

DTC PRECAUTION
Warnings for some DTCs cannot be cleared only by repairing the malfunctioning parts. If the warning is displayed after repair work, the DTC should be cleared after turning the ignition switch OFF.

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

CHASSIS DYNAMOMETER PRECAUTION
When checking with chassis dynamometer, place CONSULT-III in "INSPECTION MODE" to deactivate VDC and TCS. Mode 1 Mode 2.

NOTE:
The vehicle may move unexpectedly out of the dynamometer because of TCS and VDC operations.

CAUTION:
- Make sure that the brake control warning, master caution indicator lamps blink and "CHECK VDC
SYSTEM" is displayed on the multi information display (Test Mode is achieved).
- Secure the vehicle with the lock chain for safety.

CAN COMMUNICATION SYSTEM PRECAUTIONS
1. The CAN communication system is used for the data communication between the brake ECU, the steering angle sensor, the yaw rate/side/decel G sensor and other ECUs. If there is trouble in the CAN communication line, corresponding DTCs in the communication line are output.
2. If the DTC in the CAN communication line is output, repair the malfunction in the communication line and troubleshoot the Electronically Controlled Brake system while data communication is normal.
3. In order to enable CAN communication, a specific type of wiring is used for the CAN communication lines.
The wiring is 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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