POWER STEERING SYSTEM > PROBLEM SYMPTOMS TABLE

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HINT:
  1. Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  2. Inspect the fuses and relays related to this system before inspecting the suspected areas below.


Power Steering System 
Symptom
Suspected Area
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Heavy steering
Front tires (improperly inflated, unevenly worn)
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Front wheel alignment (incorrect)
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Front suspension (lower ball joint)
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Steering column assembly
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Torque sensor (built into steering column assembly)
-
Power steering motor
-
Speed sensor
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Auxiliary battery and power source system
-
Power steering ECU assembly power source voltage and relay
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Power steering ECU assembly
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Skid control ECU (for LHD)
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Skid control ECU (for RHD)
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Steering effort differs between turning right and left, or steering effort is uneven.
Initialization of rotation angle sensor and calibration of torque sensor zero point are not completed
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Front tires (improperly inflated, unevenly worn)
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Front wheel alignment (incorrect)
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Front suspension (lower ball joint)
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Steering gear assembly
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Torque sensor (built into steering column assembly)
-
Steering column assembly
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Power steering motor
-
Power steering ECU assembly
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While driving, steering effort does not change in accordance with vehicle speed or the steering wheel does not return properly.
Front suspension (lower ball joint)
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Speed sensor
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Skid control ECU (for LHD)
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Skid control ECU (for RHD)
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Combination meter assembly
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Torque sensor (built into steering column assembly)
-
Power steering motor
-
Power steering ECU assembly
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CAN communication system
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A knocking (or clunking) sound occurs when turning the steering wheel back and forth while power steering is operating.
Front suspension (lower ball joint)
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Steering intermediate shaft
-
Power steering ECU assembly
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Noise occurs when turning the steering wheel during low-speed driving.
Steering gear assembly
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Steering column assembly
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Friction occurs when turning the steering wheel during low-speed driving.
Power steering motor
-
Steering column assembly
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A high-pitched sound (squeaking) occurs when turning the steering wheel slowly with the vehicle stopped.
Power steering motor
-
The steering wheel vibrates and noise occurs when turning the steering wheel from lock to lock with the vehicle stopped.
Steering gear assembly
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Steering column assembly
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P/S warning light remains on.
EPS warning light circuit
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