Toyota Tacoma (2015-2018) Service Manual: Precaution

PRECAUTION

1. IGNITION SWITCH EXPRESSION

(a) The type of ignition switch used on this model differs depending on the specifications of the vehicle.

The expressions listed in the table below are used in this section.

2. TROUBLESHOOTING PRECAUTIONS

(a) When there are malfunctions 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) In order to determine the malfunctioning area, 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 (spiral cable with sensor sub-assembly) or yaw rate and acceleration sensor (airbag sensor assembly) except when required, as they cannot be adjusted correctly 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 (signal check).

(e) If replacing the skid control ECU (brake actuator assembly), always replace it with a new one (if the skid control ECU (brake actuator assembly) is not replaced with a new one, DTCs may be stored).

NOTICE:

Do not use a skid control ECU (brake actuator assembly) from another vehicle (a vehicle display model, etc.).

4. DTC PRECAUTION

(a) Some DTCs cannot be cleared only by repairing the malfunctioning parts. If the DTC is output after repair work, turn the ignition switch off to clear the DTC.

NOTICE:

If a part is still malfunctioning even after the DTC is cleared, the DTC will be stored again.

5. CHASSIS DYNAMOMETER PRECAUTION

When testing with a drum tester such as a speedometer tester, combination tester for the speedometer and brakes, or chassis dynamometer, or when jacking up the front wheels and turning the wheels, perform the following procedure to enter Inspection Mode and disable the TRAC and VSC systems.

NOTICE:

Secure the vehicle with lock chains for safety.

(a) Activating Inspection Mode (When Using the Techstream)

(1) Ensure that the ignition switch is off and the engine is stopped.

(2) Connect the Techstream to the DLC3.

(3) Turn the ignition switch to ON.

(4) Turn the Techstream on.

(5) Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Inspection Mode.

(6) Check that the TRAC OFF and VSC OFF indicator lights come on.

(b) Activating Inspection Mode (By Manual Operation)

HINT:

Perform steps "C" to "G" within 30 seconds.

(1) Ensure that the ignition switch is off and the engine is stopped (Step "A").

(2) Release the parking brake (Step "B").

(3) With the brake pedal depressed, start the engine (Step "C").

(4) While holding the brake pedal down, apply the parking brake (Step "D").

(5) With the parking brake applied, release and depress the brake pedal twice (Step "E").

(6) While holding the brake pedal down, release and apply the parking brake twice (Step "F").

(7) With the parking brake applied, release and depress the brake pedal twice (Step "G").

(8) Check that the TRAC OFF and VSC OFF indicator lights come on (Step "H").

NOTICE:

Turn the ignition switch off when 60 seconds or more have elapsed since inspection mode was entered. If the ignition switch is turned off before 60 seconds or more elapse, inspection mode continues when the ignition switch is turned ON.

6. CAN COMMUNICATION SYSTEM PRECAUTIONS

(a) The CAN communication system is used for data communication among the skid control ECU (brake actuator assembly), 4 wheel drive control ECU*, the steering angle sensor (spiral cable with sensor sub-assembly), the yaw rate and acceleration sensor (airbag sensor assembly) and other ECUs. If there is trouble in the CAN communication line, corresponding communication line DTCs are output.

(b) If any CAN communication line DTC is output, repair the malfunction in the communication line 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 of equal length. A bypass wire should not be used because the data being transmitted will be corrupted.