Toyota Venza: Fail-safe Chart

Toyota Venza Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Fail-safe Chart

FAIL-SAFE CHART

1. FAIL-SAFE OPERATION

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

The ABS control will be prohibited, but EBD control will continue as much as possible. If EBD control is impossible, the brake warning light will come on to warn the driver (See page ).
If system components have any malfunction before starting control, immediately stop the operation. If system components have any malfunction 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 termination of the systems (See page ).

ABS, EBD and BA System

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

HINT:

A malfunction in either the ABS or BA system will result in an identical operation, with ABS, BA, TRAC and VSC system control prohibited.

TRAC and VSC System

Malfunction Area	Control Method
Engine control system (TRAC and VSC systems)	Before control: Disables control During control: Uses only the brakes to effect control
Brake control system (VSC system)	Before control: Disables control During control: Uses only the engine to effect 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 and VSC systems)

Before control: Disables control

During control: Uses only the brakes to effect control

Brake control system

(VSC system)

Before control: Disables control

During control: Uses only the engine to effect control

Brake control system

(TRAC system)

Before control: Disables control

During control: Disables control (by gradually ending control)

HINT:

As for the TRAC and VSC systems, different systems prohibit different controls depending on a malfunctioning part.

Freeze Frame Data

FREEZE FRAME DATA 1. FREEZE FRAME DATA (a) Whenever an ABS DTC is detected, the skid control ECU stores the current vehicle (sensor) state as Freeze Frame Data. (b) The skid control ECU stores th ...

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