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 ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    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".

      EMPS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Meter Vehicle Velocity

      Vehicle speed from meter/

      Min.: 0 km/h (0 mph)

      Max.: 300 km/h (186.4 mph)

      		 0 km/h (0 mph) The vehicle is stopped.
      No significant fluctuation The vehicle is driven at a constant speed.
      Engine Revolution

      Engine speed/

      Min.: 0 rpm

      Max.: 12800 rpm

      		 No significant fluctuation The engine is 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 engine is running and steering wheel is being turned.
      Command Value Current

      Demanded amount of current to motor/

      Min.: -327.68 A

      Max.: 327.67 A

      		 Value changes in proportion to steering effort The engine is running and steering wheel is being turned.
      Steering Angle Velocity

      Steering angle speed/

      Min.: -32768 deg/s

      Max.: 32767 deg/s

      		 Value changes in proportion to steering effort The engine is running and steering wheel is being turned.
      Thermistor Temperature

      ECU substrate temperature/

      Min.: -40°C (-40°F)

      Max.: 150°C (302°F)

      		 -40°C to 150°C (-40°F to 302°F) Ignition switch ON
      PIG Power Supply

      Power source voltage to active motor/

      Min.: 0 V

      Max.: 20.1531 V

      		 11 to 14 V The engine is running and power steering is operating.
      IG Power Supply

      ECU power source voltage/

      Min.: 0 V

      Max.: 20.1531 V

      		 11 to 14 V Ignition switch ON
      Steering Angle Sens Sig

      Steering angle sensor signal state/

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

      OK: Steering angle 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.: -7.0 Nm

      Max.: 7.0 Nm

      		 Value changes in proportion to steering effort The engine is running and steering wheel is being turned.
      Motor Rotation Angle

      Motor rotation angle/

      Min.: 0 deg

      Max.: 360 deg

      		 During steering operation, motor rotation angle value changes from 0 to 360° The engine is running and steering wheel is being turned.
      Command Val Current 2

      Demanded amount of current to motor/

      Min.: -327.68 A

      Max.: 327.67 A

      		 Value changes in proportion to steering effort The engine is running and steering wheel is being turned.
      PIG2 Voltage

      Coil rear pressurization voltage/

      Min.: 0 V

      Max.: 45.955 V

      		 Approximately 33 V The engine is running and steering wheel is not being turned.
      Value changes within 16 to 46 V range The engine is running and steering wheel is being turned.
      Motor Voltage

      Motor power supply voltage/

      Min.: 0 V

      Max.: 45.955 V

      		 Approximately 33 V The engine is running and steering wheel is not being turned.
      Value changes within 4 to 46 V range The engine is running and steering wheel is being turned.
      Motor Terminal Volt(U)

      Motor terminal voltage (U phase)/

      Min.: 0 V

      Max.: 46.667 V

      		 Value changes within 4 to 46 V range The engine is running and steering wheel is being turned.
      Motor Terminal Volt(V)

      Motor terminal voltage (V phase)/

      Min.: 0 V

      Max.: 46.667 V

      		 Value changes within 4 to 46 V range The engine is running and steering wheel is being turned.
      Motor Terminal Volt(W)

      Motor terminal voltage (W phase)/

      Min.: 0 V

      Max.: 46.667 V

      		 Value changes within 4 to 46 V range The engine is running and steering wheel is being turned.
      Torque Sensor 1 Output

      Torque sensor voltage/

      Min.: 0 V

      Max.: 5 V

      		 2.3 to 2.7 V The engine is running and steering wheel is not turned (without load).
      2.5 to 3.8 V The engine is running and steering wheel is turned to right with vehicle stopped.
      1.2 to 2.5 V The engine is running and steering wheel is turned to left with vehicle stopped.
      Torque Sensor 2 Output

      Torque sensor voltage/

      Min.: 0 V

      Max.: 5 V

      		 2.3 to 2.7 V The engine is running and steering wheel is not turned (without load).
      1.2 to 2.5 V The engine is running and steering wheel is turned to right with vehicle stopped.
      2.5 to 3.8 V The engine is running and steering wheel is turned to left with vehicle stopped.
      TRQ1 Zero Point Value

      Torque sensor 1 zero point voltage/

      Min.: 0 V

      Max.: 5 V

      		 Values differ depending on vehicle The engine is running and steering wheel is not being turned.
      TRQ2 Zero Point Value

      Torque sensor 2 zero point voltage/

      Min.: 0 V

      Max.: 5 V

      		 Values differ depending on vehicle The engine is running and steering wheel is not being turned.
      IG ON/OFF Times

      Number of times of engine switch ON/OFF after fail detection/

      Min.: 0 time

      Max.: 65535 times

      		 - This value indicates the number of times of engine on/off after the latest DTC detection.
      PS Assist Signal

      Power steering assist signal/

      ON or OFF

      		 OFF The engine is not running.
      ON The engine is running.
      The Number of DTCs

      Number of detected DTCs when freeze frame data stored/

      Min.: 0

      Max.: 255

      		 0 to 255 -

  2. CONTROL HISTORY (DATA LIST)

    EMPS
    Tester Display Measurement Item/Range Normal Condition Diagnostic Note
    Motor Overheat Record

    Continuous overheat prevention control record/

    Unrec or Rec

    		 Unrec -
    Motor Lo Power Record

    PIG power source voltage drop record/

    Unrec or Rec

    		 Unrec -
    Eng Rev Inter Record

    Record of engine speed interruption/

    Unrec or Rec

    		 Unrec -
    Str Angle Inter Record

    Record of steering sensor signal interruption occurrence display/

    Unrec or Rec

    		 Unrec -
    Spd Sig Invalid Record

    Record of vehicle speed signal invalid/

    Unrec or Rec

    		 Unrec -
    Battery Voltage Lo Record

    Battery voltage reduction history/

    Min.: 0 times, Max.: 65535 times

    		 0 to 65535 -

    Tech Tips


    • 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 at either full lock position for a long time. In such cases, the amount of power assist returns to normal if the steering wheel is not turned for approximately 10 minutes with the engine idling.

    • If the battery is not sufficiently charged or the voltage decreases temporarily, the amount of power assist will be reduced and the EPS (P/S) warning light will come on. In such cases, the amount of power assist returns normal when the battery voltage recovers.

    • When any value other than 0 is displayed for the "battery voltage reduction history", inspect the charging system Click here.