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:

FCM Destination Information Unmatched (C1AA1)
DESCRIPTION When the forward recognition camera is replaced with a new one, the new forward recognition camera attempts to store country specification information received from the main body ECU (multiplex network body ECU) and ECM. If the country specification information stored in the forwa ...

Disposal
DISPOSAL CAUTION / NOTICE / HINT CAUTION: Before performing pre-disposal deployment of any SRS part, review and closely follow all applicable environmental and hazardous material regulations. Predisposal deployment may be considered hazardous material treatment. PROCEDURE 1. PRECAUTION ...

Automatic High Beam System (B124B)
DESCRIPTION The main body ECU (multiplex network body ECU) determines the status of the automatic high beam system based on the automatic high beam system signal from the forward recognition camera. DTC No. Detection Item DTC Detection Condition Trou ...

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