Toyota Tacoma manuals

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

FAIL-SAFE CHART

1. FAIL SAFE OPERATION

  • If there is a problem with any sensor signals or hydraulic brake booster systems, the skid control ECU prohibits the power supply to the actuator in the hydraulic brake booster and informs the ECM of VSC system failure.

    The hydraulic brake booster turns off each solenoid and the ECM shuts off the VSC control (traction control signal) from the skid control ECU accordingly, which turns out to be as if the ABS, TRAC, A-TRAC and VSC systems were not installed.

    The ABS control is prohibited, but EBD control continues as far as possible. If EBD control is impossible, the BRAKE warning light comes on to warn the driver (See page ). ).

  • If system components have any malfunctions before starting control, immediately stop the operation.

    If system components have any malfunctions during control, gradually stop the control so as not to trigger a sudden change in vehicle conditions.

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

  • VSC control continues as much as possible while the TRAC OFF indicator light is on even when the engine has failed.

HINT:

If the hydraulic brake booster encounters a malfunction, brake performance is gradually lost and ABS, BA, TRAC, A-TRAC, VSC, AUTO LSD, hill-start assist control, Crawl Control and multi-terrain select controls are prohibited.

(a) ABS, EBD and BA system:

HINT:

If the ABS, BA or EBD system malfunctions, the following controls are prohibited as shown in the table below.

Malfunction Area

Control Method

ABS system

ABS, BA, TRAC, A-TRAC, VSC, AUTO LSD control, hill-start assist, CRAWL and multi-terrain select control are prohibited.

BA system

ABS, BA, TRAC, A-TRAC, VSC, AUTO LSD control, hill-start assist, CRAWL and multi-terrain select control are prohibited.

EBD system

ABS, BA, EBD, TRAC, A-TRAC, VSC, AUTO LSD control, hill-start assist, CRAWL and multi-terrain select control are prohibited.

(b) TRAC, A-TRAC, VSC, AUTO LSD, hill-start assist control and CRAWL system:

HINT:

If TRAC, A-TRAC, VSC, AUTO LSD, hill-start assist control and/or CRAWL malfunction, the following controls are prohibited as shown in the table below.

Malfunction Area

Control Method

Engine control system

(TRAC and A-TRAC systems)

Before control: Disables control

During control: Uses only brakes to effect control

Brake control system

(VSC system)

Before control: Disables control

During control: Uses only brakes to effect control

Brake control system

(TRAC, A-TRAC, AUTO LSD, hill-start assist control and CRAWL systems)

Before control: Disables control

During control: Disables control (by gradually ending control)

2. SYSTEM TEMPERATURE PROTECTION OPERATION

If TRAC, A-TRAC, AUTO LSD, CRAWL or Hill-Start Assist Control system has been used constantly for a long time, the temperature of the hydraulic brake booster, may increase excessively. If the temperature increases excessively, the VSC warning buzzer sounds intermittently. If the temperature increases more, the VSC warning buzzer sounds for 3 seconds repeatedly and the indicator light either comes on or blinks.

System

Indicator Condition

TRAC, A-TRAC and hill-start assist control systems

TRAC OFF indicator light comes on

Slip indicator light comes on

AUTO LSD system

Slip indicator light comes on

AUTO LSD indicator light stays on

CRAWL system

TRAC OFF indicator light comes on

CRAWL indicator light blinks and then turns off

Dtc Check / Clear
DTC CHECK / CLEAR 1. DTC CHECK / CLEAR (when Using Techstream) (a) Check for DTCs. (1) Connect the Techstream to the DLC3. (2) Turn the ignition switch to ON. (3) Turn the Techstream on. (4) Ent ...

Freeze Frame Data
FREEZE FRAME DATA 1. FREEZE FRAME DATA HINT: Whenever a DTC is detected or the ABS operates, the skid control ECU stores the current vehicle (sensor) state as freeze frame data. The ...

Other materials:

Precaution
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Front Axle Hub Bolt
Installation INSTALLATION PROCEDURE 1. INSTALL FRONT AXLE HUB BOLT (a) Install a new hub bolt through the axle hub. (b) Install the washer plate, as shown in the illustration, through the hub bolt, and install the hub bolt by tightening the hub nut. 2. INSTALL FRONT DISC 3. INSTALL FRON ...

Installation
INSTALLATION PROCEDURE 1. INSTALL ENGINE WATER PUMP ASSEMBLY (a) Install the engine water pump assembly and a new gasket to the timing chain cover assembly with the 15 bolts. Torque: for Bolt A and B : 11 N·m {112 kgf·cm, 8 ft·lbf} for Bolt C : 21 N·m {214 kgf ...

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