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 power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power 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): Power switch on (READY) and vehicle stopped

      • No significant fluctuation: Power switch on (READY) and vehicle driven 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

      		 Power switch on (READY) 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

      		 Power switch on (READY) 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

      		 Power switch on (READY) 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) -
      PIG Power Supply Power source voltage to active motor

      Min.: 0.0000 V

      Max.: 20.1531 V

      		 9 to 16 V Power switch on (IG)
      IG Power Supply IG power source voltage

      Min.: 0.0000 V

      Max.: 20.1531 V

      		 8 to 16 V Power switch on (READY) and steering wheel being turned
      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 angle sensor abnormal

      NG(3): Communication Error

      		 -
      Torque Sensor 1 Output Torque sensor 1 rotation angle

      Min.: 0.000 deg

      Max.: 1441.770 deg

      		 Value changes from 0 to 360° every 45° of steering angle -
      Torque Sensor 2 Output Torque sensor 2 rotation angle

      Min.: 0.000 deg

      Max.: 1441.770 deg

      		 Value changes from 0 to 360° every 45° of steering angle -
      TRQ1 Zero Point Value Zero point value of torque sensor 1

      Min.: 0.000 deg

      Max.: 1441.770 deg

      		 - -
      TRQ2 Zero Point Value Zero point value of torque sensor 2

      Min.: 0.000 deg

      Max.: 1441.770 deg

      		 - -
      Steering Wheel Torque Steering wheel torque

      Min.: -327.68 Nm

      Max.: 7.00 Nm

      		 Value changes in proportion to steering effort Power switch on (READY) 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° Power switch on (READY) 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 Power switch on (READY) and steering wheel being turned
      PIG2 Voltage Coil rear pressurization voltage

      Min.: 0.000 V

      Max.: 98.000 V

      • Approximately 27 V: Power switch on (READY) and steering wheel being turned

      • Approximately 27 to 34 V: Power switch on (READY) and steering wheel not being turned

      		 -
      Motor Voltage Motor power supply voltage

      Min.: 0.000 V

      Max.: 98.000 V

      		 - -
      Motor Terminal Volt(U) Motor terminal voltage (U phase)

      Min.: 0.000 V

      Max.: 98.000 V

      		 Value changes within 4 to 35 V range Power switch on (READY) and steering wheel being turned
      Motor Terminal Volt(V) Motor terminal voltage (V phase)

      Min.: 0.000 V

      Max.: 98.000 V

      		 Value changes within 4 to 35 V range Power switch on (READY) and steering wheel being turned
      Motor Terminal Volt(W) Motor terminal voltage (W phase)

      Min.: 0.000 V

      Max.: 98.000 V

      		 Value changes within 4 to 35 V range Power switch on (READY) and steering wheel being turned
      IG ON/OFF Times Number of times of power switch on/off after fail detection

      Min.: 0 times

      Max.: 65535 times

      		 - This value indicates the number of times of power switch on/off after the latest DTC detection.
      Motor Overheat Record Continuous overheat prevention control record Unrec or Rec Unrec

      Unrec: Unrecorded

      Rec: Recorded
      Motor Lo Power Record PIG power source voltage drop record Unrec or Rec Unrec

      Unrec: Unrecorded

      Rec: Recorded
      Eng Rev Inter Record Record of engine signal interruption Unrec or Rec Unrec

      Unrec: Unrecorded

      Rec: Recorded
      Str Angle Inter Record Record of steering angle 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 Auxiliary battery voltage reduction history

      Min.: 0 times

      Max.: 65535 times

      		 0 to 65535 times -
      Battery Control Count (Body ECU) Number of auxiliary 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: Power switch on (IG)

      ON: Power switch on (READY)

      		 -
      Ready Status Ready status OFF or Ready

      OFF: Except power switch on (READY)

      Ready: Power switch on (READY)

      		 -
      Motor Actual Current 2 Amount of current to motor

      Min.: -327.68 A

      Max.: 327.67 A

      		 Value changes in proportion to steering effort Power switch on (READY) and steering wheel being turned
      Torque Sensor 1 Avg(SIN) Torque sensor 1 average value (SIN phase)

      Min.: 0.0000 V

      Max.: 4.9725 V

      		 - -
      Torque Sensor 1 Avg(COS) Torque sensor 1 average value (COS phase)

      Min.: 0.0000 V

      Max.: 4.9725 V

      		 - -
      Torque Sensor 2 Avg(SIN) Torque sensor 2 average value (SIN phase)

      Min.: 0.0000 V

      Max.: 4.9725 V

      		 - -
      Torque Sensor 2 Avg(COS) Torque sensor 2 average value (COS phase)

      Min.: 0.0000 V

      Max.: 4.9725 V

      		 - -
      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 portion where heat was generated in the power steering ECU assembly and motor coil

      Min.: 0 times

      Max.: 255 times

      		 - -
      Assist Limit Cnt(Power Voltage Low) Number of times that assist limit was performed due to auxiliary 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 auxiliary 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 power 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 in a case where the motor is overloaded because it is locked 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 power was set to a value suitable for high-speed driving when driving at high speeds due to an abnormal vehicle speed signal

      Min.: 0 times

      Max.: 255 times

      		 - -
      Battery Voltage Keep Limit Cnt Number of times that the system was limited to conserve auxiliary battery voltage

      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 power 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 after the power switch was turned on (IG) before Assist Limit Record 1 was stored

      Min.: 0.0 s

      Max.: 53687091.1 s

      		 - -
      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 power 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 after the power switch was turned on (IG) before Assist Limit Record 2 was stored

      Min.: 0.0 s

      Max.: 53687091.1 s

      		 - -
      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 power 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 after the power switch was turned on (IG) before Assist Limit Record 3 was stored

      Min.: 0.0 s

      Max.: 53687091.1 s

      		 - -
      Current Key Cycle Number of current trip

      Min.: 0 times

      Max.: 65535 times

      		 - -
      Current Key Cycle Elapsed Time Time elapsed since power 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

      		 - -
      The Number of DTCs Number of detected DTCs when freeze frame data 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, turn the power switch on (READY) and do not turn the steering wheel for approximately 10 minutes to improve power assist a little.

      • If the auxiliary 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 auxiliary battery voltage recovers.

      • When the value displayed for "Battery Control Count (Body ECU)" in the Data List is not 0 with the auxiliary battery voltage low, the system is limiting the seat heater, rear window defogger and windshield deicer operation. In this case, inspect the charging system.

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