POWER ASSIST SYSTEMS POWER STEERING SYSTEM PROBLEM SYMPTOMS TABLE
- HINT:
- ·
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.
·Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| Heavy steering | Front tires (improperly inflated, unevenly worn) | 
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| Front wheel alignment (incorrect) |
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| Electric power steering column sub-assembly |
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| Torque sensor (Electric power steering column sub-assembly) | - | |
| Power steering motor assembly | - | |
| Speed sensor circuit (w/ ABS) |
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| Speed sensor circuit (w/o ABS) |
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| 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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| CAN communication system |
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| Steering effort differs between turning right and left, or steering effort is uneven | Front tires (improperly inflated, unevenly worn) |
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| Front wheel alignment (incorrect) |
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| Steering gear assembly |
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| Torque sensor (Electric power steering column sub-assembly) | - | |
| Electric power steering column sub-assembly |
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| Power steering motor assembly | - | |
| 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 | Speed sensor circuit (w/ ABS) |
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| Speed sensor circuit (w/o ABS) |
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| Torque sensor (Electric power steering column sub-assembly) | - | |
| Power steering motor assembly | - | |
| 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 | 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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| Electric power steering column sub-assembly |
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| Friction occurs when turning the steering wheel during low-speed driving | Power steering motor assembly | - |
| Electric power steering column sub-assembly |
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| A high-pitched sound (squeaking) occurs when turning the steering wheel slowly with the vehicle stopped | Power steering motor assembly | - |
| 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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| Electric power steering column sub-assembly |
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| DTCs cannot be output (terminals TC and CG of the DLC3 are connected) | TC and CG terminal circuit |
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| IG power source circuit |
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| Combination meter assembly |
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| Signal check cannot be performed (terminals TS and CG of the DLC3 are connected) | TS and CG terminal circuit |
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| Power steering ECU assembly |
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| EPS warning light remains on | EPS warning light circuit |
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