LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2012 >> IS 350 Base, AWD >> Repair and Diagnosis >> Steering >> Power Steering >> Power Steering System (Diagnostics - Introduction) >> Power Steering System >> Data List / Active Test >> Data List / Active Test
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Data List / Active Test

  1. 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.

    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. Connect the Techstream (with CAN VIM) to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Chassis / EMPS / Data List.
    5. According to the display on the Techstream, 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 mph)
      1. 0 km/h (0 mph)
      2. No significant fluctuation
      1. Vehicle is stopped
      2. Vehicle is driven at a constant speed
      Engine Revolution Engine revolution/
      Min.: 0 rpm, Max.: 12800 rpm      		 No significant fluctuation Engine is running at a constant speed
      Motor Current Amount of current to motor/
      Min.:-327.68 A, Max.: 327.67 A      		 Value changes in proportion to steering effort Power steering is in operation
      Command Value Current Demanded amount of current to motor/
      Min.:-327.68 A, Max.: 327.67 A      		 Value changes in proportion to steering effort Power steering is in operation
      Steering Angle Velocity Steering angle speed/
      Min.:-32768 deg/s, Max.: 32767 deg/s      		 Value changes in proportion to steering speed Steering wheel is turned
      Thermistor Temperature ECU substrate temperature/
      Min.:-40°C, Max.: 150°C      		 - Engine switch on (IG)
      PIG Power Supply Power source voltage to activate motor/
      Min.: 0 V, Max.: 20.1531 V      		 10 to 14 V Power steering is in operation
      IG Power Supply ECU power source voltage/
      Min.: 0 V, Max.: 20.1531 V      		 10 to 14 V Engine switch on (IG)
      Steering Angle Sens Sig Steering angle sensor signal status/
      OK or NG      		 - -
      Torque Sensor 1 Output Torque sensor 1 rotation angle/
      Min.: 0 deg, Max.: 1441.77 deg      		 Value changes from 0 to 1441.77° every 22.5° of steering angle Steering wheel is turned
      Torque Sensor 2 Output Torque sensor 2 rotation angle/
      Min.: 0 deg, Max.: 1441.77 deg      		 Value changes from 0 to 1441.77° every 22.5° of steering angle Steering wheel is turned
      TRQ1 Zero Point Value Zero point value of torque sensor 1/
      Min.: 0 deg, Max.: 1441.77 deg      		 Values differ depending on vehicle Steering wheel is not turned
      (without load)
      TRQ2 Zero Point Value Zero point value of torque sensor 2/
      Min.: 0 deg, Max.: 1441.77 deg      		 Values differ depending on vehicle Steering wheel is not turned
      (without load)
      Steering Wheel Torque Steering torque/
      Min.:-327.68 N*m, Max.: 7.0 N*m      		 Value changes in proportion to steering effort Steering wheel is turned
      Motor Rotation Angle Motor rotation angle/
      Min.: 0 deg, Max.: 1441.77 deg      		 Value changes from 0 to 1441.77° every 5° of steering angle Steering wheel is turned
      Command Val Current 2 Amount of current demanded by motor 2/
      Min.:-327.68 A, Max.: 327.67 A      		 - -
      PIG2 Voltage Motor drive voltage after pressurization/ Min.: 0 V, Max.: 45.955 V 27 to 34 V Power steering is in operation
      Motor Voltage Motor power source voltage/
      Min.: 0 V, Max.: 45.955 V      		 27 to 34 V Power steering is in operation
      Motor Terminal Volt (U) Motor terminal voltage (U phase)/
      Min.: 0 V, Max.: 46.667 V      		 0 to 34 V Power steering is in operation
      Motor Terminal Volt (V) Motor terminal voltage (V phase)/
      Min.: 0 V, Max.: 46.667 V      		 0 to 34 V Power steering is in operation
      Motor Terminal Volt (W) Motor terminal voltage (W phase)/
      Min.: 0 V, Max.: 46.667 V      		 0 to 34 V Power steering is in operation
      IG ON/OFF Times Number of times IG switch is turned on after DTC detection/
      Min.: 0 time, Max.: 65535 times      		 - -
      Motor Overheat Record Continuous overheat prevention control record/
      Rec or Unrec      		 - -
      Motor Lo Power Record PIG power source voltage drop record/
      Rec or Unrec      		 - -
      Eng Rev Inter Record Record of engine revolution signal interruption/
      Rec or Unrec      		 - -
      Str Angle Inter Record Record of steering angle sensor signal interruption/
      Rec or Unrec      		 - -
      Spd Sig Invalid Record Record of vehicle speed signal invalid/
      Rec or Unrec      		 - -
      Battery Voltage BATTERY VOLTAGE
      Min.: 0 V, Max.: 25.5 V      		 10 to 14V -
      PS Assist Signal Power steering assist signal/
      ON or OFF      		 - Engine switch on (IG)
      The Number of DTCs Number of detected DTCs when freeze frame data is stored/
      Min.: 0, Max.: 255      		 - -
scientia non olet · About LEMON Manuals