Can Communication System (For Sedan) Fail-Safe Chart

Power Source Network. Yaris. Ncp93, 131
Networking. Yaris. Ncp93, 131

  1. FAIL-SAFE FUNCTION

Can Communication System (For Sedan) -- Fail-Safe Chart



FAIL-SAFE FUNCTION

  1. When communication fails in any of the CAN bus lines (communication lines) due to a short circuit or other causes, the fail-safe function, which is specified for each system, operates to prevent the system from malfunctioning.

  2. Relationships between components and system functions and effects of communication failure on these functions. (For further details, see the pages for each system.)

    Function
    		ECM
    		ABS and Traction Actuator (Skid Control ECU)*1
    		Brake Actuator (Skid Control ECU)*2
    		Steering Sensor
    		Yaw Rate Sensor
    		Condition when communication impossible
    		DTC detection (Driver detectable)
    VSC control (Controls driving force while VSC in operation)
    		○
    		●

    		○
    		○
    		Control inoperative (Gradually stops controlling during VSC control)
    		Detectable (Light comes on)
    TRC control (Controls driving force and engine power when wheel slip detected during acceleration)
    		○
    		●

    		○
    		○
    		Control inoperative (Gradually stops controlling during TRC control)
    		Detectable (Light comes on)
    ABS control (Controls driving force while ABS in operation)
    		○
    		●
    		●
    		○
    		○
    		Control inoperative (Gradually stops controlling during ABS control)
    		Detectable (Light comes on)
    Electric power steering (Outputs assist current)
    		○
    		○
    		○


    		Steering assist force is maintained at the level for about 70 km/h (43.5 mph)
    		Detectable (Light comes on)
    Event recorder
    (Tracks event data such as vehicle speed and accelerator opening angle and records data)
    		○




    		Data not recorded
    		None
    Air conditioning control,
    PTC heater control
    		○




    		Air conditioning function stops,
    PCT heater function stops
    		None (Air conditioning inoperative)
    Meter Display (Displays operation condition and DTCs)
    		○
    		○
    		○


    		Light does not come on, illuminates abnormally, or blinks abnormally
    		Detectable (Abnormal display)
    Buzzer control
    		○
    		○



    		Buzzer function stops
    		None (Light comes on)
    Illumination control





    		Light illumination rheostat inoperative
    		None (Rheostat inoperative)
    Power door lock control
    		○




    		Unlock permitted
    		None (Wireless door lock operation)
    *1: w/ VSC
    *2: w/ ABS

    HINT:
    1. ●: Control master
    2. ○: System related

    Function
    		Power Steering ECU
    		Center Airbag Sensor Assembly
    		Air Conditioning Amplifier
    		Combination Meter ECU
    		Main Body ECU
    		Condition when communication impossible
    		DTC detection (Driver detectable)
    VSC control (Controls driving force while VSC in operation)





    		Control inoperative (Gradually stops controlling during VSC control)
    		Detectable (Light comes on)
    TRC control (Controls driving force and engine power when wheel slip detected during acceleration)





    		Control inoperative (Gradually stops controlling during TRC control)
    		Detectable (Light comes on)
    ABS control (Controls driving force while ABS in operation)





    		Control inoperative (Gradually stops controlling during ABS control)
    		Detectable (Light comes on)
    Electric power steering (Outputs assist current)
    		●




    		Steering assist force is maintained at the level for about 70 km/h (43.5 mph)
    		Detectable (Light comes on)
    Event recorder
    (Tracks event data such as vehicle speed and accelerator opening angle and records data)

    		●

    		○

    		Data not recorded
    		None
    Air conditioning control,
    PTC heater control


    		●
    		○

    		Air conditioning function stops,
    PCT heater function stops
    		None (Air conditioning inoperative)
    Meter Display (Displays operation condition and DTCs)
    		○
    		○

    		●
    		○
    		Light does not come on, illuminates abnormally, or blinks abnormally
    		Detectable (Abnormal display)
    Buzzer control



    		●
    		○
    		Buzzer function stops
    		None (Light comes on)
    Illumination control



    		○
    		●
    		Light illumination rheostat inoperative
    		None (Rheostat inoperative)
    Power door lock control

    		○

    		○
    		●
    		Unlock permitted
    		None (Wireless door lock operation)
    HINT:
    1. ●: Control master
    2. ○: System related