POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Gasoline Model): DATA LIST / ACTIVE TEST; 2019 - 2022 MY Avalon [04/2018

DATA LIST / ACTIVE TEST

DATA LIST

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

NOTICE:

In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / EMPS / Data List.

(f) Read the Data List according to the display on the Techstream.

Chassis > EMPS > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Meter Vehicle Velocity

Vehicle speed from speedometer

Min.: 0.0 km/h (0.0 MPH)

Max.: 300.0 km/h (186.4 MPH)

0 km/h (0 MPH): Engine running and vehicle stopped
No significant fluctuation: Engine running and vehicle driven at a constant speed

Wheel Speed Right

Rear right wheel speed

Min.: 0 km/h (0 MPH)

Max.: 255 km/h (158 MPH)

0 km/h (0 MPH): Engine running and vehicle stopped
No significant fluctuation: Engine running and vehicle driven at a constant speed

Wheel Speed Left

Rear left wheel speed

Min.: 0 km/h (0 MPH)

Max.: 255 km/h (158 MPH)

0 km/h (0 MPH): Engine running and vehicle stopped
No significant fluctuation: Engine running and vehicle driven at a constant speed

Engine Revolution

Engine speed

Min.: 0 rpm

Max.: 12800 rpm

No significant fluctuation

Engine running at a constant speed

Motor Actual Current

Amount of current to motor

Min.: -327.68 A

Max.: 327.67 A

Value changes in proportion to steering effort

- The value increases when turning right and decreases when turning left

Engine running and steering wheel being turned

Command Value Current

Requested current to motor

Min.: -327.68 A

Max.: 327.67 A

Value changes in proportion to steering effort

- The value increases when turning right and decreases when turning left

Engine running and steering wheel being turned

Steering Angle Velocity

Steering angle speed

Min.: -32768 deg/s

Max.: 32767 deg/s

Value changes in proportion to steering speed

- The value increases when turning left and decreases when turning right

Engine running and steering wheel being turned

Thermistor Temperature

ECU substrate temperature

Min.: -50.0°C (-58.0°F)

Max.: 150.0°C (302.0°F)

-50°C to 150°C (-58°F to 302°F)

IG Power Supply

IG power source voltage

Min.: 0.0000 V

Max.: 20.1531 V

8 to 16 V

Engine switch on (IG)

Steering Angle Sens Sig

Steering sensor signal state

OK or NG(1) or NG(2) or NG(3)

OK: Steering sensor signal received

NG(1): The learning has not completed

NG(2): Steering sensor abnormal

NG(3): Communication error

Steering Wheel Torque

Steering wheel torque

Min.: -327.68 Nm

Max.: 7.00 Nm

Value changes in proportion to steering effort

- The value increases when turning left and decreases when turning right

Engine running and steering wheel being turned

Motor Rotation Angle

Motor rotation angle

Min.: 0.000 deg

Max.: 1441.770 deg

During steering operation, motor rotation angle value changes from 0 to 360°

Engine running and steering wheel being turned

Command Val Current 2

Requested current to motor

Min.: -327.68 A

Max.: 327.67 A

Value changes in proportion to steering effort

Engine running and steering wheel being turned

Motor Voltage

Motor power supply voltage

Min.: 0.000 V

Max.: 98.000 V

9 to 16 V

Always

TRQ1 Zero Point Value

Zero point value of torque sensor 1

Min.: 0.0000 V

Max.: 4.9725 V

2.3 to 2.7 V

Engine running and steering wheel not being turned (without load)

TRQ2 Zero Point Value

Zero point value of torque sensor 2

Min.: 0.0000 V

Max.: 4.9725 V

2.3 to 2.7 V

Engine running and steering wheel not being turned (without load)

IG ON/OFF Times

Number of times of engine switch turned on/off since latest DTC detection

Min.: 0 times

Max.: 65535 times

Motor Overheat Record

Continuous overheat prevention control record

Unrec or Rec

Unrec

Unrec: Unrecorded

Rec: Recorded

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 driven at a low speed, or if the steering wheel is kept in either full lock position for a long time.

Motor Lo Power Record

PIG power source voltage drop record

Unrec or Rec

Unrec

Unrec: Unrecorded

Rec: Recorded

If the PIG power source voltage decreases temporarily, the amount of power assist will be reduced.

Eng Rev Inter Record

Record of engine signal interruption

Unrec or Rec

Unrec

Unrec: Unrecorded

Rec: Recorded

Str Angle Inter Record

Record of steering sensor signal interruption occurrence display

Unrec or Rec

Unrec

Unrec: Unrecorded

Rec: Recorded

Spd Sig Invalid Record

Record of vehicle speed signal invalid

Unrec or Rec

Unrec

Unrec: Unrecorded

Rec: Recorded

Battery Voltage Lo Record

Battery voltage reduction history

Min.: 0 times

Max.: 65535 times

0 to 65535 times

Battery Control Count (Body ECU)

Number of battery load control operations

Min.: 0 times

Max.: 65535 times

PS Assist Signal

Status of the record of power steering assist signal

OFF or ON

OFF: Engine switch on (IG)

ON: Engine running

Motor Actual Current 2

Amount of current to motor

Min.: -327.68 A

Max.: 327.67 A

Value changes in proportion to steering effort

Engine running and steering wheel being turned

Rotation Angle Sens Avg(SIN)

Rotation angle sensor average (SIN)

Min.: 0.0000 V

Max.: 4.9725 V

Rotation Angle Sens Avg(COS)

Rotation angle sensor average (COS)

Min.: 0.0000 V

Max.: 4.9725 V

Motor Overheat Limit Cnt(Normal)

Number of times that assist limit was performed according to the estimated temperature of the motor coil and heat generating components of the power steering ECU assembly

Min.: 0 times

Max.: 255 times

Assist Limit Cnt(Power Voltage Low)

Number of times that assist limit was performed due to battery voltage having dropped to 9 V or below

Min.: 0 times

Max.: 255 times

Power Vol Low Prevention Limit Cnt

Number of times that assist limit was performed due to battery voltage having dropped to 9.7 V or below

Min.: 0 times

Max.: 255 times

Eng Stall/Ready OFF Cnt

Number of times that assist limit was performed after the engine stalled and the engine switch was turned off

Min.: 0 times

Max.: 255 times

Motor Overheat Limit Cnt(Motor Overload)

Number of times that assist limit was performed to prevent the system from overheating when the motor was overloaded due to the steering wheel being turned to the full lock position or a tire hitting a curb

Min.: 0 times

Max.: 255 times

Assist Limit Cnt(Vehicle Spd Sig Malf)

Number of times that assist limit was performed due to battery voltage having dropped to 9 V or below

Min.: 0 times

Max.: 255 times

Battery Voltage Keep Limit Cnt

Number of times that assist limit was performed due to battery voltage having dropped to 9.7 V or below

Min.: 0 times

Max.: 255 times

Assist Limit Record 1

Information of assist limit that was used in the past or is currently in use (latest history)

Unrec, Mtr Overheat, Pow Vol Low, Pow Vol Low Prevent, Eng Stall, Ready OFF, Mtr Overload, Vhcl Spd Sig Malf, Batt Vol Keep

Record 1 Key Cycle

Number of times that the engine switch was turned to ON before Assist Limit Record 1 was stored

Min.: 0 times

Max.: 65535 times

Record 1 Key Cycle Elapsed Time

Period of time that elapsed since the engine switch was turned to ON before Assist Limit Record 1 was stored

Min.: 0.0 s

Max.: 53687091.1 s

Record 1 Power Source

Power source operating status when Assist Limit Record 1 was stored

No Data, Running, Stop

Assist Limit Record 2

Information of assist limit that was used in the past (second latest history)

Unrec, Mtr Overheat, Pow Vol Low, Pow Vol Low Prevent, Eng Stall, Ready OFF, Mtr Overload, Vhcl Spd Sig Malf, Batt Vol Keep

Record 2 Key Cycle

Number of times that the engine switch was turned to ON after Assist Limit Record 2 was stored before Assist Limit Record 1 was stored

Min.: 0 times

Max.: 65535 times

Record 2 Key Cycle Elapsed Time

Period of time that elapsed since the engine switch was turned to ON before Assist Limit Record 2 was stored

Min.: 0.0 s

Max.: 53687091.1 s

Record 2 Power Source

Power source operating status when Assist Limit Record 2 was stored

No Data, Running, Stop

Assist Limit Record 3

Information of assist limit that was used in the past (third latest history)

Unrec, Mtr Overheat, Pow Vol Low, Pow Vol Low Prevent, Eng Stall, Ready OFF, Mtr Overload, Vhcl Spd Sig Malf, Batt Vol Keep

Record 3 Key Cycle

Number of times that the engine switch was turned to ON after Assist Limit Record 3 was stored before Assist Limit Record 2 was stored

Min.: 0 times

Max.: 65535 times

Record 3 Key Cycle Elapsed Time

Period of time that elapsed since the engine switch was turned to ON before Assist Limit Record 3 was stored

Min.: 0.0 s

Max.: 53687091.1 s

Record 3 Power Source

Power source operating status when Assist Limit Record 3 was stored

No Data, Running, Stop

Current Key Cycle

Number of times that engine switch was turned to ON

Min.: 0 times

Max.: 65535 times

Current Key Cycle Elapsed Time

Time elapsed since engine switch was turned to ON

Min.: 0.0 s

Max.: 53687091.1 s

Steering Angle

Steering angle

Min.: -3072.0 deg

Max.: 3070.5 deg

Torque Sensor 1 Output

Torque sensor 1 output value

Min.: 0.0000 V

Max.: 4.9725 V

Torque Sensor 2 Output

Torque sensor 2 output value

Min.: 0.0000 V

Max.: 4.9725 V

Torque Sensor 1 Power Supply

Torque sensor 1 power supply voltage

Min.: 0.0000 V

Max.: 4.9725 V

Torque Sensor 2 Power Supply

Torque sensor 2 power supply voltage

Min.: 0.0000 V

Max.: 4.9725 V

Rotation Angle Sensor Output 1

Rotation angle sensor Vx1 output voltage

Min.: 0.0000 V

Max.: 4.9725 V

Rotation Angle Sensor Output 2

Rotation angle sensor Vx2 output voltage

Min.: 0.0000 V

Max.: 4.9725 V

Rotation Angle Sensor Output 3

Rotation angle sensor Vy1 output voltage

Min.: 0.0000 V

Max.: 4.9725 V

Rotation Angle Sensor Output 4

Rotation angle sensor Vy2 output voltage

Min.: 0.0000 V

Max.: 4.9725 V

Motor 1 Terminal Current (U)

Motor 1 terminal current (U phase)

Min.: -327.68 A

Max.: 327.67 A

Value changes in proportion to steering effort

Engine running and steering wheel being turned

Motor 1 Terminal Current (V)

Motor 1 terminal current (V phase)

Min.: -327.68 A

Max.: 327.67 A

Value changes in proportion to steering effort

Engine running and steering wheel being turned

Motor 1 Terminal Current (W)

Motor 1 terminal current (W phase)

Min.: -327.68 A

Max.: 327.67 A

Value changes in proportion to steering effort

Engine running and steering wheel being turned

Motor 2 Terminal Current (U)

Motor 2 terminal current (U phase)

Min.: -327.68 A

Max.: 327.67 A

Value changes in proportion to steering effort

Engine running and steering wheel being turned

Motor 2 Terminal Current (V)

Motor 2 terminal current (V phase)

Min.: -327.68 A

Max.: 327.67 A

Value changes in proportion to steering effort

Engine running and steering wheel being turned

Motor 2 Terminal Current (W)

Motor 2 terminal current (W phase)

Min.: -327.68 A

Max.: 327.67 A

Value changes in proportion to steering effort

Engine running and steering wheel being turned

Motor 1 U Phase Duty

Motor 1 U phase duty

Min.: 0.00%

Max.: 100.00%

Motor 1 V Phase Duty

Motor 1 V phase duty

Min.: 0.00%

Max.: 100.00%

Motor 1 W Phase Duty

Motor 1 W phase duty

Min.: 0.00%

Max.: 100.00%

Motor 2 U Phase Duty

Motor 2 U phase duty

Min.: 0.00%

Max.: 100.00%

Motor 2 V Phase Duty

Motor 2 V phase duty

Min.: 0.00%

Max.: 100.00%

Motor 2 W Phase Duty

Motor 2 W phase duty

Min.: 0.00%

Max.: 100.00%

Motor 1 Terminal Volt (U)

Motor 1 terminal voltage (U phase)

Min.: 0.000 V

Max.: 98.000 V

Value changes within 4 to 35 V range

Engine running and steering wheel being turned

Motor 1 Terminal Volt (V)

Motor 1 terminal voltage (V phase)

Min.: 0.000 V

Max.: 98.000 V

Value changes within 4 to 35 V range

Engine running and steering wheel being turned

Motor 1 Terminal Volt (W)

Motor 1 terminal voltage (W phase)

Min.: 0.000 V

Max.: 98.000 V

Value changes within 4 to 35 V range

Engine running and steering wheel being turned

Motor 2 Terminal Volt (U)

Motor 2 terminal voltage (U phase)

Min.: 0.000 V

Max.: 98.000 V

Value changes within 4 to 35 V range

Engine running and steering wheel being turned

Motor 2 Terminal Volt (V)

Motor 2 terminal voltage (V phase)

Min.: 0.000 V

Max.: 98.000 V

Value changes within 4 to 35 V range

Engine running and steering wheel being turned

Motor 2 Terminal Volt (W)

Motor 2 terminal voltage (W phase)

Min.: 0.000 V

Max.: 98.000 V

Value changes within 4 to 35 V range

Engine running and steering wheel being turned

Motor 1 PIG Power Supply

Power supply voltage to active motor 1

Min.: 0.0000 V

Max.: 20.1531 V

9 to 16 V

Engine running and steering wheel being turned

Motor 2 PIG Power Supply

Power supply voltage to active motor 2

Min.: 0.0000 V

Max.: 20.1531 V

9 to 16 V

Engine running and steering wheel being turned

The Number of DTCs

Number of detected DTCs when freeze frame data was stored

Min.: 0

Max.: 255

0 to 255

HINT:

With the vehicle stopped or driving very slowly, if the steering wheel is turned repeatedly or turned to a lock position and the vehicle is driven for an extended period of time, the amount of power assist is decreased to prevent overheating of the motor and ECU. If this occurs, engine running and do not turn the steering wheel for approximately 10 minutes to improve power assist.
If the battery is not sufficiently charged or the voltage decreases temporarily, the amount of power assist is reduced and the EPS warning light comes on. In such cases, the amount of power assist returns to normal when the battery voltage recovers.