Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIZC
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: PROBLEM SYMPTOMS TABLE; 2016 MY Sienna [12/2015 - 08/2016]

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.

Power Steering System

Symptom

Suspected Area

See page

Steering is heavy.

Front tires (improperly inflated, unevenly worn)

2016 MY Sienna [12/2015 - 08/2016]; TIRE / WHEEL: TIRE AND WHEEL SYSTEM: INSPECTION

Front wheel alignment (incorrect)

2016 MY Sienna [12/2015 - 08/2016]; ALIGNMENT / HANDLING DIAGNOSIS: FRONT WHEEL ALIGNMENT: ADJUSTMENT

Front suspension (Lower ball joint)

2016 - 2020 MY Sienna [12/2015 -        ]; FRONT SUSPENSION: FRONT LOWER BALL JOINT: INSPECTION

Power steering gear

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING GEAR / LINKAGE: STEERING GEAR: INSPECTION

Steering column assembly (Torque sensor, Power steering motor, Power steering ECU)

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL

Speed sensor

2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: TEST MODE PROCEDURE

Brake actuator (Skid control ECU)

2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR: REMOVAL

Battery and power source system

-

Power source voltage of steering column assembly (Power steering ECU)

2016 - 2020 MY Sienna [12/2015 -        ]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: TERMINALS OF ECU

Steering effort differs between right and left or is uneven.

Front tires (improperly inflated, unevenly worn)

2016 MY Sienna [12/2015 - 08/2016]; TIRE / WHEEL: TIRE AND WHEEL SYSTEM: INSPECTION

Front wheel alignment (incorrect)

2016 MY Sienna [12/2015 - 08/2016]; ALIGNMENT / HANDLING DIAGNOSIS: FRONT WHEEL ALIGNMENT: ADJUSTMENT

Front suspension (Lower ball joint)

2016 - 2020 MY Sienna [12/2015 -        ]; FRONT SUSPENSION: FRONT LOWER BALL JOINT: INSPECTION

Power steering gear

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING GEAR / LINKAGE: STEERING GEAR: INSPECTION

Steering column assembly (Torque sensor, Power steering motor, Power steering ECU)

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL

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)

2016 - 2020 MY Sienna [12/2015 -        ]; FRONT SUSPENSION: FRONT LOWER BALL JOINT: INSPECTION

CAN communication system

2016 MY Sienna [12/2015 - 08/2016]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

Speed sensor

2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: TEST MODE PROCEDURE

Brake actuator (Skid control ECU)

2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR: REMOVAL

Combination meter

2016 - 2020 MY Sienna [12/2015 -        ]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

Power steering gear

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING GEAR / LINKAGE: STEERING GEAR: INSPECTION

Steering column assembly (Torque sensor, Power steering motor, Power steering ECU)

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL

A knocking (or cranking) sound occurs when turning the steering wheel while power steering is operating.

Front suspension (Lower ball joint)

2016 - 2020 MY Sienna [12/2015 -        ]; FRONT SUSPENSION: FRONT LOWER BALL JOINT: INSPECTION

Steering intermediate shaft

-

Power steering gear

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING GEAR / LINKAGE: STEERING GEAR: INSPECTION

Steering column assembly

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL

Noise occurs when turning the steering wheel during low speed driving.

Power steering gear

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING GEAR / LINKAGE: STEERING GEAR: INSPECTION

Steering column assembly

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL

Friction occurs when turning the steering wheel during low speed driving.

Steering column assembly

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL

High pitched sounds (squeaking) occurs when turning the steering wheel slowly with the vehicle stopped.

Power steering gear

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING GEAR / LINKAGE: STEERING GEAR: INSPECTION

Steering column assembly (Power steering motor)

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL

The steering wheel vibrates and noise occurs when turning the steering wheel from lock to lock.

Power steering gear

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING GEAR / LINKAGE: STEERING GEAR: INSPECTION

Steering column assembly

2016 - 2020 MY Sienna [12/2015 -        ]; STEERING COLUMN: STEERING COLUMN ASSEMBLY: REMOVAL

EPS warning light remains on.

Proceed to PS warning light remains on

2016 MY Sienna [12/2015 - 08/2016]; POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: PS Warning Light Remains ON