Tech Tips
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 | See page |
|---|---|---|
| Heavy steering | Front tires (improperly inflated, unevenly worn) | |
| Front wheel alignment (incorrect) | ||
| Front suspension (lower ball joint) | ||
| Steering gear | ||
| Power steering motor assembly (for LHD) | ||
| Power steering motor assembly (for RHD) | ||
| Battery and power source system (for 1KR-FE) | ||
| Battery and power source system (for 1NR-FE) | ||
| Battery and power source system (for 1ND-TV) | ||
| Power source voltage of power steering ECU assembly | ||
| Power steering ECU assembly (for LHD) | ||
| Power steering ECU assembly (for RHD) | ||
| Vehicle condition (Steering wheel is turned from left to right repeatedly with vehicle stopped or heavy load is continuously applied to vehicle) | ||
| Steering effort differs between turning right and left or uneven | Steering center point (zero point) recorded incorrectly | |
| Front tires (improperly inflated, unevenly worn) | ||
| Front wheel alignment (incorrect) | ||
| Front suspension (lower ball joint) | ||
| Steering gear | ||
| Torque sensor (built into steering column sub-assembly) (for LHD) | ||
| Torque sensor (built into steering column sub-assembly) (for RHD) | ||
| Power steering motor assembly (for LHD) | ||
| Power steering motor assembly (for RHD) | ||
| Steering column sub-assembly (for LHD) | ||
| Steering column sub-assembly (for RHD) | ||
| Power steering ECU assembly (for LHD) | ||
| Power steering ECU assembly (for RHD) | ||
| While driving, steering effort does not change in accordance with vehicle speed or steering wheel does not return properly | Front suspension (lower ball joint) | |
| Front speed sensor | ||
| Rear speed sensor | ||
| Brake actuator assembly (Skid control ECU) (w/o VSC) | ||
| Brake actuator assembly (Skid control ECU) (w/ VSC, for TMC Made) | ||
| Brake actuator assembly (Skid control ECU) (w/ VSC, for TMMF Made) | ||
| Torque sensor (built into steering column sub-assembly) (for LHD) | ||
| Torque sensor (built into steering column sub-assembly) (for RHD) | ||
| Power steering motor assembly (for LHD) | ||
| Power steering motor assembly (for RHD) | ||
| Power steering ECU assembly (for LHD) | ||
| Power steering ECU assembly (for RHD) | ||
| CAN communication system | ||
| Friction occurs when turning steering wheel during low speed driving | Power steering motor assembly (for LHD) | |
| Power steering motor assembly (for RHD) | ||
| Steering column assembly (for LHD) | ||
| Steering column assembly (for RHD) | ||
| Spiral cable sub-assembly | ||
| Interference between the steering wheel and column cover (for LHD) | ||
| Interference between the steering wheel and column cover (for RHD) | ||
| High-pitched sound (squeaking) occurs when turning steering wheel slowly with vehicle stopped | Power steering motor assembly (for LHD) | |
| Power steering motor assembly (for RHD) | ||
| Installation state of steering wheel (for LHD) | ||
| Installation state of steering wheel (for RHD) | ||
| Steering wheel vibrates and noise occurs when turning steering wheel with vehicle stopped | Steering gear | |
| Steering column sub-assembly (for LHD) | ||
| Steering column sub-assembly (for RHD) | ||
| Installation state of steering wheel (for LHD) | ||
| Installation state of steering wheel (for RHD) | ||
| EPS warning light remains on | EPS warning light circuit |