Power Source Network. Yaris. Ncp93, 131
Networking. Yaris. Ncp93, 131
Can Communication System (For Hatchback With Separate Type Yaw Rate Sensor) -- Fail-Safe Chart |
| FAIL-SAFE FUNCTION |
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.
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), 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), Yaw rate sensor Neutral control does not operate. U0129
(Nothing)Engine Cruise control ECM Skid control ECU (brake actuator assembly), 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) Main body ECU, Yaw rate sensor - Under control: After backup control to stabilize the vehicle behavior is completed, the normal brake is switched to and control is prohibited.
- 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) ECM, Steering angle sensor (spiral cable sub-assembly), Main body ECU, Yaw rate sensor - Under control: After backup control to stabilize the vehicle behavior is completed, the normal brake is switched to and control is prohibited.
- 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.)Air Conditioning Air conditioning control Air conditioning amplifier assembly ECM - Coolant signal during the ignition switch ON: Controlled with default value of 80°C.
- Engine model during the ignition switch ON: Controlled with default value which differs according to vehicle models.
- Not controlled without the ignition switch ON.
U0100
(Nothing)Air Conditioning Simple load control Air conditioning amplifier assembly Power steering ECU assembly - Previous status held during the ignition switch ON. (when resetting: no load control.)
- 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) - Previous status held during the ignition switch ON. (when resetting: no load control.)
- 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) - Previous status held during the ignition switch ON.
- Not controlled without the ignition switch ON.
U0142
(Nothing)Air Conditioning External temperature compensation control Air conditioning amplifier assembly Combination meter assembly - Speed signal input during the ignition switch ON : Controlled with the default value of 0 km/h.
- 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 - Conduct the display auto dimming control without the tail cancel status.
- 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 - The dome light is turned off.
- 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) 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) Signal is treated as active. Nothing
(Indicator light comes on.)- Under control: After backup control to stabilize the vehicle behavior is completed, the normal brake is switched to and control is prohibited.