POWER STEERING SYSTEM DATA LIST / ACTIVE TEST


  1. DATA LIST

    Tech Tips

    Using the intelligent tester 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 intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the intelligent tester on.

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

    6. According to the display on the intelligent tester, read the "Data List".

      EMPS
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Engine Speed

      Vehicle speed from meter/

      Min.: 0 km/h (0 mph)

      Max.: 300 km/h (186.4 mph)

      		 0 km/h (0 mph) Vehicle is stopped
      No significant fluctuation Vehicle is driven at a constant speed
      Engine Rev

      Engine speed/

      Min.: 0 rpm

      Max.: 12800 rpm

      		 No significant fluctuation Engine is running at a constant speed
      Motor Actual

      Amount of current to motor/

      Min.: -327.68 A

      Max.: 327.67 A

      		 Value changes in proportion to steering effort Engine running, steering is being turned
      Command Value

      Demanded amount of current to motor/

      Min.: -327.68 A

      Max.: 327.67 A

      		 Value changes in proportion to steering effort Engine running, steering is being turned
      Str Angle Vel

      Steering angle speed/

      Min.: -32768 deg/s

      Max.: 32767 deg/s

      		 Value changes in proportion to steering effort Engine running, steering wheel is being turned
      Thermistor Temp

      ECU substrate temperature/

      Min.: -40°C (-40°F)

      Max.: 150°C (302°F)

      		 -40°C to 150°C (-40°F to 302°F) Engine switch on (IG)
      PIG Supply

      Power source voltage to active motor/

      Min.: 0 V

      Max.: 20.1531 V

      		 11 to 14 V Engine running, power steering is operating
      IG Supply

      ECU power source voltage/

      Min.: 0 V

      Max.: 20.1531 V

      		 11 to 14 V Engine switch on (IG)
      Str 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 Torque

      Steering wheel torque/

      Min.: -7.0 Nm

      Max.: 7.0 Nm

      		 Value changes in proportion to steering effort Engine running and steering is being turned
      Motor Rotate

      Motor rotation angle/

      Min.: 0 deg

      Max.: 360 deg

      		 During steering operation, motor rotation angle value changes from 0 to 360° Engine running and steering is being turned
      Command Val 2

      Demanded amount of current to motor/

      Min.: -327.68 A

      Max.: 327.67 A

      		 Value changes in proportion to steering effort Engine running and steering is being turned
      PIG2 Voltage

      Coil rear pressurization voltage/

      Min.: 0 V

      Max.: 45.955 V

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

      Motor power supply voltage/

      Min.: 0 V

      Max.: 45.955 V

      		 Approximately 33 V Engine running and steering wheel is not being turned
      Value changes within 4 to 46 V range Engine running and steering wheel is being turned
      Mtr Terminal (U)

      Motor terminal voltage (U phase)/

      Min.: 0 V

      Max.: 46.667 V

      		 Value changes within 4 to 46 V range Engine running and steering wheel is being turned
      Mtr Terminal (V)

      Motor terminal voltage (V phase)/

      Min.: 0 V

      Max.: 46.667 V

      		 Value changes within 4 to 46 V range Engine running and steering wheel is being turned
      Mtr Terminal (W)

      Motor terminal voltage (W phase)/

      Min.: 0 V

      Max.: 46.667 V

      		 Value changes within 4 to 46 V range Engine running and steering wheel is being turned
      Trq1

      Torque sensor voltage/

      Min.: 0 V

      Max.: 5 V

      		 2.3 to 2.7 V Engine running and steering wheel is not turned (without load)
      2.5 to 3.8 V Engine running and steering wheel is turned to right with vehicle stopped
      1.2 to 2.5 V Engine running and steering wheel is turned to left with vehicle stopped
      Trq2

      Torque sensor voltage/

      Min.: 0 V

      Max.: 5 V

      		 2.3 to 2.7 V Engine running and steering wheel is not turned (without load)
      1.2 to 2.5 V Engine running and steering wheel is turned to right with vehicle stopped
      2.5 to 3.8 V Engine running and steering wheel is turned to left with vehicle stopped
      Trq1 Zero Val

      Torque sensor voltage/

      Min.: 0 V

      Max.: 5 V

      		 Values differ depending on vehicle Engine running and steering wheel is not being turned
      Trq2 Zero Val

      Torque sensor voltage/

      Min.: 0 V

      Max.: 5 V

      		 Values differ depending on vehicle Engine 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 Sig

      Power steering assist signal/

      ON or OFF

      		 OFF Engine running, no steering load (in neutral position)
      ON Engine running and steering wheel is being turned
      DTC

      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
    Mtr Overheat

    Continuous overheat prevention control record/

    Unrec or Rec

    		 Unrec -
    Mtr Low Power

    PIG power source voltage drop record/

    Unrec or Rec

    		 Unrec -
    Eng Rev Inter

    Record of engine speed interruption/

    Unrec or Rec

    		 Unrec -
    Str Angle Inter

    Record of steering sensor signal interruption occurrence display/

    Unrec or Rec

    		 Unrec -
    Spd Sig Invalid

    Record of vehicle speed signal invalid/

    Unrec or Rec

    		 Unrec -
    Batt Vo Low

    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 for 2GR-FE, Click here for 2AZ-FE).