Toyota Tacoma (2015-2018) Service Manual: Fail-safe Chart

Toyota Tacoma (2015-2018) Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Vacuum Brake Booster) / Fail-safe Chart

FAIL-SAFE CHART

If there is a problem with sensor signals or actuator systems, the skid control ECU prohibits power supply to the brake actuator assembly and informs the ECM of a VSC system malfunction.
The brake actuator assembly turns off the solenoids and the ECM stops its VSC control according to signals from the skid control ECU. The vehicle will operate in a manner similar to a vehicle that is not equipped with ABS, TRAC and VSC systems.

ABS control will be prohibited, but EBD control will continue to the extent that EBD control is possible. If EBD control is impossible, the brake warning light will come on to warn the driver (See page ).
If a VSC system component malfunctions before VSC control begins, VSC control will be prohibited.
If a system component malfunctions during VSC control, the system will gradually stop performing control so as not to trigger a sudden change in vehicle operation.

If it is impossible for control to continue, the warning light comes on to inform the driver of system control termination (See page ).

ABS, EBD and BA Systems

Malfunction Area	Control Method
ABS system	ABS, BA, TRAC and VSC control prohibited
BA system	ABS, BA, TRAC and VSC control prohibited
EBD system	ABS, EBD, BA, TRAC and VSC control prohibited

TRAC and VSC Systems

Malfunction Area	Control Method
Engine control system (TRAC system)	Before control: Disables control During control: Uses only the brakes to perform control
Brake control system (VSC system)	Before control: Disables control During control: Uses only the engine to perform control
Brake control system (TRAC system)	Before control: Disables control During control: Disables control (by gradually ending control)

Malfunction Area

Control Method

Engine control system

(TRAC system)

Before control: Disables control

During control: Uses only the brakes to perform control

Brake control system

(VSC system)

Before control: Disables control

During control: Uses only the engine to perform control

Brake control system

(TRAC system)

Before control: Disables control

During control: Disables control (by gradually ending control)

Dtc Check / Clear

DTC CHECK / CLEAR 1. DTC CHECK/CLEAR (When Using Techstream) (a) Check the DTC. (1) Turn the ignition switch off. (2) Connect the Techstream to the DLC3. (3) Turn the ignition switch to ON. (4) ...

Freeze Frame Data

FREEZE FRAME DATA 1. FREEZE FRAME DATA (a) Using the Techstream, check the vehicle condition (ECU, sensor) when the brake system operates or a DTC is output. 2. CHECK FREEZE FRAME DATA WHEN BRAKE ...

Other materials:

Installation
INSTALLATION CAUTION / NOTICE / HINT CAUTION: Some of these service operations affect the SRS airbag system. Read the precautionary notices concerning the SRS airbag system before servicing (See page ). HINT: Use the same procedure for both the RH and LH sides. The procedure des ...

Dtc Check / Clear
DTC CHECK / CLEAR NOTICE: The steering lock ECU (steering lock actuator or UPR bracket assembly) does not store history DTCs. If any DTCs are output, confirm and record them as soon as possible. Do not turn the engine switch off or clear the DTCs until the DTCs are confirmed an ...

Cruise SET Indicator Light Circuit
DESCRIPTION The ECM illuminates the cruise control SET indicator by sending indicator output demand signals to the combination meter assembly via CAN communication. The cruise control SET indicator illuminates when the dynamic radar cruise control system is controlling vehicle speed. The crui ...