Toyota Tacoma (2015-2018) Service Manual: 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
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). - 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
).
|
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 |
|
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:
Diagnosis System
DIAGNOSIS SYSTEM
1. DESCRIPTION
(a) Sliding roof system data and Diagnostic Trouble Codes (DTCs) can be read
through the vehicle Data Link Connector 3 (DLC3). When the system seems to be malfunctioning,
use the Techstream to check for malfunctions and perform repairs.
2. CHECK DLC3
(a) Check ...
Symbols used in illustrations
The symbol of a circle with a slash
through it means “Do not”, “Do not do this”, or “Do not let this happen”.
Arrows indicating operations
Indicates the action (pushing, turning,
etc.) used to operate switches and other devices.
Indicates the outcome of an operation
(e.g. a ...
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms.
If multiple suspected areas are listed, the potential causes of the symptoms
are listed in order of probability in the "Suspected Area" column of the
table. Check each sy ...
