Can Communication System (For Hatchback Except Separate Type Yaw Rate Sensor) Fail-Safe Chart

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

  1. FAIL-SAFE FUNCTION

Can Communication System (For Hatchback Except Separate Type Yaw Rate Sensor) -- Fail-Safe Chart



FAIL-SAFE FUNCTION

  1. When communication fails in any of the main wires (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. The table below shows the effects on each system when communication is impossible. For further details, refer to each system.

    System
    		Function
    (Function Description)
    		Control Master
    		System Related
    		Fail-safe Operation
    		DTC
    (Driver Detectable)
    Engine
    		Electrical load control
    		ECM
    		Power steering ECU assembly
    		The idle speed increase for an electrical load is not performed.
    		Nothing
    (The idle speed changes.)
    Engine
    		Air conditioner-linked control
    		ECM
    		Air conditioning amplifier assembly
    		Air conditioner-linked control does not operate. (cannot idle up)
    		Nothing
    (Air conditioning inoperative.)
    Engine
    		PTC heater
    		ECM
    		Air conditioning amplifier assembly
    		PTC heater does not operate. (does not permit operations)
    		Nothing
    (The idle speed changes. The heater function worsens. PTC heater does not operate.)
    Engine
    		Charging control
    		ECM
    		Air conditioning amplifier assembly, Main body ECU (multiplex network body ECU)
    		The idle speed increase for a charge request is not performed.
    		Nothing
    (The idle speed increase for a charge request is not performed.)
    Charge control is not prohibited.
    		Nothing
    (Tail lights flicker and blower airflow changes.)
    Engine
    		Eco driving indicator
    		ECM
    		Combination meter assembly
    		Indicator is turned off.
    		Nothing
    (Detected by the status that the indicator is turned off.)
    Engine
    		Integrated control
    		ECM
    		Skid control ECU (brake actuator assembly) (w/ VSC), Power steering ECU assembly
    		Following performances are not operative: Stable constant-speed drivability, starting ability, re-acceleration ability and improved feeling of acceleration by estimating the required torque from the driver's accelerator pedal control and performing torque control according to the driving situation.
    		Nothing
    (Following performances are not operative: Stable constant-speed drivability, starting ability, re-acceleration ability and improved feeling of acceleration by estimating the required torque from the driver's accelerator pedal control and performing torque control according to the driving situation.)
    Engine
    		Neutral Control
    		ECM
    		Skid control ECU (brake actuator assembly)
    		Neutral control does not operate.
    		U0129
    (Nothing)
    Engine
    		Cruise control
    		ECM
    		Skid control ECU (brake actuator assembly) (w/ VSC), Combination meter assembly
    		Nothing
    		Nothing
    (Indicator light blink.)
    Airbag
    		Event Recorder
    		Airbag sensor assembly
    		ECM, Skid control ECU (brake actuator assembly
    		An invalid value is stored
    		Nothing
    (Nothing)
    VSC
    		ABS control
    		Skid control ECU (brake actuator assembly) (w/ VSC)
    		Airbag sensor assembly, Main body ECU
    1. Under control: After backup control to stabilize the vehicle behavior is completed, the normal brake is switched to and control is prohibited.
    2. Not under control: Cannot start control.
    		U0073, U0123, U0142, U0124
    (Complied with FMVSS126: Brake warning light comes on. ABS warning light comes on. Slip indicator light comes on.)
    VSC
    		VSC control
    		Skid control ECU (brake actuator assembly) (w/ VSC)
    		ECM, Airbag sensor assembly, Steering angle sensor (spiral cable sub-assembly), Main body ECU
    1. Under control: After backup control to stabilize the vehicle behavior is completed, the normal brake is switched to and control is prohibited.
    2. Not under control: Cannot start control.
    		U0073, U0100, U0123, U0142, U0124, U0126
    (Complied with FMVSS126: Brake warning light comes on. ABS warning light comes on. Slip indicator light comes on.)
    ABS
    		ABS control
    		Skid control ECU (brake actuator assembly) (w/o VSC)
    		Main body ECU
    1. Under control: After backup control to stabilize the vehicle behavior is completed, the normal brake is switched to and control is prohibited.
    2. Not under control: Cannot start control.
    		U0073, U0142
    (ABS warning light comes on)
    Air Conditioning
    		Air conditioning control
    		Air conditioning amplifier assembly
    		ECM
    1. Coolant signal during the ignition switch ON: Controlled with default value of 80°C.
    2. Engine model during the ignition switch ON: Controlled with default value which differs according to vehicle models.
    3. Not controlled without the ignition switch ON.
    		U0100
    (Nothing)
    Air Conditioning
    		Simple load control
    		Air conditioning amplifier assembly
    		Power steering ECU assembly
    1. Previous status held during the ignition switch ON. (when resetting: no load control.)
    2. Not controlled without the ignition switch ON.
    		U0131
    (Nothing)
    Air Conditioning
    		Panel dimming control
    		Air conditioning amplifier assembly
    		Main body ECU (multiplex network body ECU)
    1. Previous status held during the ignition switch ON. (when resetting: no load control.)
    2. Not controlled without the ignition switch ON.
    		U0142
    (Cannot switch between dimming and not dimming (after resetting, dimming status remains), Not IG-ON: Nothing.)
    Air Conditioning
    		Destination determinate control
    		Air conditioning amplifier assembly
    		Main body ECU (multiplex network body ECU)
    1. Previous status held during the ignition switch ON.
    2. Not controlled without the ignition switch ON.
    		U0142
    (Nothing)
    Air Conditioning
    		External temperature compensation control
    		Air conditioning amplifier assembly
    		Combination meter assembly
    1. Speed signal input during the ignition switch ON : Controlled with the default value of 0 km/h.
    2. Not controlled without the ignition switch ON.
    		U0155
    (The matching reliability of the displayed external temperature to the actual external temperature is deteriorated. The suitability level of air conditioner outlet airflow compensation is reduced.)
    Main body
    		Automatic Dimming of Display
    		Main body ECU (multiplex network body ECU)
    		Combination meter assembly
    1. Conduct the display auto dimming control without the tail cancel status.
    2. If the light sensor illumination signal value is less than the display dimming value, the in-room displays and indicators are dimmed.
    		U0155
    (Nothing)
    Main body
    		Illumination
    		Main body ECU (multiplex network body ECU)
    		ECM
    1. The dome light is turned off.
    2. The interior foot light illumination is turned off.
    		U0100, U0101
    (The dome light is not turned off immediately after the vehicle is left.)
    Main body
    		Lighting control (DRL control)
    		Main body ECU (multiplex network body ECU)
    		ECM
    		DRL control operation fails.
    		Nothing
    (Detected by failure of DRL control.)
    EPS
    		Electronic power steering system
    		Power steering ECU assembly
    		Skid control ECU (brake actuator assembly)
    		Control is performed temporarily with the steering assist amount set to that used when the vehicle speed is 70 km/h.
    		U0129
    (Indicator light comes on.)
    EPS
    		Assist calculation
    		Power steering ECU assembly
    		Skid control ECU (brake actuator assembly)
    		Because the vehicle speed cannot be detected, control is temporarily continued assuming 70 km/h. If the speed is below 70 km/h, the steering wheel will feel heavy. If the speed is above 70 km/h, the steering wheel will feel light.
    		U0129
    (Indicator light comes on.)
    EPS
    		Assist map selection
    		Power steering ECU assembly
    		ECM, Skid control ECU (brake actuator assembly)
    		An assist map that is suitable for the vehicle cannot be selected, so assistance is performed with a temporary assist map.
    		Nothing
    (Indicator light comes on.)
    Combination meter
    		Vehicle speed indication
    (speedometer display for vehicle speed signal from skid control ECU (brake actuator assembly))
    		Combination meter assembly
    		Skid control ECU (brake actuator assembly) (w/ VSC)
    		Signal is treated as 0.
    		U0129
    (Vehicle speed on the meter is indicated as 0 km/h. Drive monitor calculation stops.)
    Combination meter
    		Tachometer
    		Combination meter assembly
    		ECM
    		Signal is treated as 0.
    		U0100
    (Tachometer rpm displayed as 0 rpm. Drive monitor calculation stops.)
    Combination meter
    		Airbag
    (Airbag warning ON/OFF)
    		Combination meter assembly
    		Airbag sensor assembly
    		Signal is treated as active.
    		U0151
    (Warning light comes on.)
    Combination meter
    		EPS warning
    		Combination meter assembly
    		Power steering ECU assembly
    		Signal is treated as active.
    		U0131
    (Warning light comes on.)
    Combination meter
    		Slip warning
    		Combination meter assembly
    		Skid control ECU (brake actuator assembly) (w/ VSC)
    		Signal is treated as active.
    		Nothing
    (Indicator light comes on.)