Antilock Brakes / Traction Control Systems: Service Precautions
BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: PRECAUTION
1. IGNITION SWITCH EXPRESSIONS
(a) The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section.
2. TROUBLESHOOTING PRECAUTIONS
(a) When there is a malfunction with terminal contact points or problems with part installation, removal and installation of the suspected parts may completely or temporarily return the system to normal.
(b) 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 them before disconnecting each connector or removing and installing parts.
(c) Since the system may be influenced by malfunctions in systems other than the VSC system, be sure to check for DTCs in other systems.
3. HANDLING PRECAUTIONS
(a) Do not remove or install VSC parts, such as the steering angle sensor or the yaw rate and acceleration sensor, except when necessary, as they must be calibrated after removal or 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 VSC system.
(c) Be sure to remove and install the ECU, brake actuator and each sensor, etc. with the ignition switch off unless otherwise specified in the inspection procedure.
(d) 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 Techstream, and also check that system functions and signals received by the ECU are normal using Test Mode.
4. DTC PRECAUTION
(a) Warnings for some DTCs will not be cleared by just replacing the defective parts. If a warning is still displayed after completing a repair, turn the ignition switch off before beginning the procedure for clearing DTCs.
NOTICE:
If a part is still malfunctioning even after the DTC is cleared, the DTC will be stored again.
5. CHASSIS DYNAMOMETER PRECAUTION
CAUTION:
Secure the vehicle with a lock chain for safety.
NOTICE:
When performing procedures related to VSC OFF switch operation, make sure that the system is in VSC OFF mode.
When testing with a 2-wheel drum tester such as a speedometer tester, a combination tester for the speedometer and brake or a chassis dynamometer, or when jacking up the front wheels and turning the wheels, perform the following procedure to enter Inspection Mode and stop the TRAC and VSC systems.
HINT
The vehicle may move unexpectedly out of the dynamometer due to TRAC and VSC operations.
(a) Activate Inspection Mode (when using the Techstream):
(1) Make sure that the ignition switch is off and the engine is stopped.
(2) for Manual Transaxle:
Check that the shift lever is in neutral and apply the parking brake.
for Automatic Transaxle:
Check that the shift lever is in P.
(3) Connect the Techstream to the DLC3.
(4) Start the engine.
(5) Turn the Techstream on.
(6) Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Inspection Mode.
(7) Check if the slip indicator light in the combination meter comes on.
HINT
* If the slip indicator light in the combination meter does not come on, repeat the steps above.
* Turning the ignition switch off ends Inspection Mode.
(b) Activate Inspection Mode (when not using the Techstream):
HINT
Perform steps "C" to "G" within 30 seconds.
(1) Make sure that the ignition switch is off and the engine is stopped (Step "A").
(2) for Manual Transaxle:
Check that the shift lever is in neutral and apply the parking brake (Step "B").
for Automatic Transaxle:
Make sure that the shift lever is in P and apply the parking brake (Step "B").
(3) Start the engine (Step "C").
(4) Depress and release the brake pedal twice (Step "D").
(5) Depress and hold the brake pedal, then release and apply the parking brake twice (Step "E").
(6) With the parking brake applied, depress and release the brake pedal twice (Step "F").
(7) Check if the slip indicator light in the combination meter comes on (Step "G").
HINT
* If the slip indicator light in the combination meter does not come on in step "G", repeat steps "A" through "G".
* Turning the ignition switch off ends Inspection Mode.
6. CAN COMMUNICATION SYSTEM PRECAUTIONS
(a) The CAN communication system is used for data communication between the skid control ECU, the steering angle sensor, the yaw rate and acceleration sensor and other ECUs. If there are any problems in the CAN communication lines, corresponding DTCs for the communication lines are output.
(b) If any CAN communication line DTCs are output, repair the malfunction in the communication lines and troubleshoot the VSC system after data communication becomes 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.