Toyota CH-R Service Manual: Fail-safe Chart

FAIL-SAFE CHART

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 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, VSC and brake hold 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 system warning light (red indicator) will come on to warn the driver.

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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.

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  • When a malfunction occurs in the VSC system or electric parking brake system, brake hold control prohibits brake hold operation to prevent incorrect operation and protect the system.

    HINT:

    When control is prohibited, the brake hold operated indicator light blinks, and the code for the system where the malfunction occurred during diagnostic mode is displayed by the brake hold standby indicator light.

ABS, EBD and BA System

Item

Operation

Malfunction in the ABS.

ABS, BA, TRAC and VSC control prohibited.

Brake hold control prohibited

Malfunction in the BA system.

ABS, BA, TRAC and VSC control prohibited.

Brake hold control prohibited

Malfunction in the EBD system.

ABS, EBD, BA, TRAC and VSC control prohibited.

Brake hold control prohibited

TRAC and VSC System

Item

Operation

Malfunction in the engine control system (TRAC and VSC systems).

Before control: Disables control.

During control: Uses only the brakes to perform control.

Malfunction in the brake control system (VSC system).

Before control: Disables control.

During control: Uses only the engine to perform control.

Malfunction in the brake control system (TRAC system).

Before control: Disables control.

During control: Disables control (by gradually ending control).

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

    Data List / Active Test
    DATA LIST / ACTIVE TEST DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any part ...

    Other materials:

    Toyota CH-R Service Manual > Electric Parking Brake Actuator: Precaution
    PRECAUTION IGNITION SWITCH EXPRESSIONS (a) The type of ignition switch used on this model differs depending on the specifications of the vehicle. The expressions listed in the table below are used in this section. Expression Ignition Switch (Position) Engine Swi ...

    Toyota CH-R Service Manual > Immobiliser System(w/ Smart Key System): Engine Immobiliser System Malfunction (B2799)
    DESCRIPTION If there is a communication malfunction between the ECM and ID code box (immobiliser code ECU), or when the communication ID codes do not match, the ECM stores this DTC. DTC No. Detection Item DTC Detection Condition Trouble Area ...

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