Toyota Yaris: Power Steering System / Fail-safe Chart
FAIL-SAFE CHART
If a problem occurs in the power steering system, the power steering assist will be stopped or the amount of power assist will be decreased to protect the system.
Power Steering System
Malfunction | Fail-safe Operation | EPS warning light | Buzzer |
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Torque sensor (electric power steering column sub-assembly) malfunction
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Power steering motor (power steering ECU assembly) malfunction
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Power steering ECU assembly malfunction
| Power steering assist stops or assist amount is limited | Red or yellow | Sounds intermittently or once |
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Vehicle speed signal malfunction
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Skid control ECU (brake actuator assembly) malfunction
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Decrease in battery voltage (not malfunction)
| Power steering assist is temporarily limited | Yellow | Sounds once |
HINT:
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If the power steering assist stops, the EPS warning light comes on (red).
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If the amount of power assist is reduced, the EPS warning light comes on (yellow) and a vibration or sound may occur.
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The amount of power assist may be decreased to prevent the motor and ECUs from overheating if the steering wheel is continuously turned when the vehicle is either stopped or being driven at a low speed, or if the steering wheel is kept at either full lock position for a long time. In such cases, the amount of power assist returns to normal when the steering wheel is not turned for approximately 10 minutes with the engine running.
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If the auxiliary battery is not sufficiently charged or the voltage decreases temporarily, the amount of power assist will be reduced and the EPS warning light will come on. In such cases, the amount of power assist returns to normal when the auxiliary battery voltage recovers.
FREEZE FRAME DATA FREEZE FRAME DATA NOTICE:
It is difficult to show the specified values (judgment values) clearly because freeze frame data values change significantly due to differences in measurement conditions, surroundings, or vehicle conditions...
DATA LIST / ACTIVE TEST DATA LIST HINT: Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts...
Other information:
On-vehicle InspectionON-VEHICLE INSPECTION PROCEDURE 1. INSPECT HORN RELAY ASSEMBLY (a) Check the resistance. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition 3 - 5 Auxiliary battery voltage not applied between terminals 1 and 2 10 kΩ or higher 3 - 5 Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω If the result is not as specified, replace the horn relay assembly...
PARTS LOCATION ILLUSTRATION
*1 FORWARD RECOGNITION CAMERA (w/ Toyota Safety Sense) *2 MILLIMETER WAVE RADAR SENSOR ASSEMBLY (w/ Toyota Safety Sense) *3 BRAKE ACTUATOR ASSEMBLY *4 ECM ILLUSTRATION
*1 4WD ECU ASSEMBLY - - ILLUSTRATION
*1 COMBINATION METER ASSEMBLY *2 METER MIRROR SUB-ASSEMBLY (w/ Headup Display) *3 CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) *4 MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) *5 AIR CONDITIONING AMPLIFIER ASSEMBLY *6 AIRBAG SENSOR ASSEMBLY *7 POWER STEERING ECU ASSEMBLY *8 CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) *9 STEERING SENSOR *10 ENGINE STOP AND START ECU *11 STEREO COMPONENT EQUALIZER ASSEMBLY (w/ Active Noise Control System) *12 POWER DISTRIBUTION BOX ASSEMBLY *13 DLC3 - - ILLUSTRATION
*1 NO...
Categories
Before refueling, close all the doors, windows, and the liftgate/trunk
lid, and switch the ignition OFF.
To open the fuel-filler lid, pull
the remote fuel-filler lid release.
To remove the fuel-filler cap, turn it counterclockwise.
Attach the removed cap to the
inner side of the fuel-filler lid.
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