POWER STEERING SYSTEM DATA LIST / ACTIVE TEST


  1. DATA LIST

    Tech Tips

    Using the GTS 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.

    Note

    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.


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / EMPS / Data List.

    6. According to the display on the GTS, read the Data List.


      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 left and decreases when turning right

      		 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 left and decreases when turning right

      		 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

      • Approximately 27 V: Engine running and steering wheel being turned

      • Approximately 27 to 34 V: Engine running and steering wheel not being turned

      		 -
      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
      Stop&Start Ctrl Mode Status of the record of stop and start control mode IG, Run, Stopreq, Stop, Restart

      IG: Engine switch on (IG) (Before engine started)

      Run: Engine running

      Stopreq: Engine stop requested

      Stop: Engine stopped

      Restart: Engine restarting

      		 -
      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 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 on (IG) 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 on (IG) 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 on (IG) 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 on (IG) 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 on (IG) 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 on (IG) 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 on (IG)

      Min.: 0 times

      Max.: 65535 times

      		 - -
      Current Key Cycle Elapsed Time Time elapsed since engine switch was turned on (IG)

      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 -

      Tech Tips


      • 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, idle the engine 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.