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 ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Turn the tester on.

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

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

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

    Vehicle speed from meter/

    Min.: 0.0 km/h (0 mph)

    Max.: 300.0 km/h (186.4 mph)

    		 0.0 km/h (0 mph) Turn the ignition switch ON and vehicle stopped
    No significant fluctuation Vehicle driven at constant speed
    Engine Revolution

    Engine revolution

    Min: 0 rpm

    Max: 12800 rpm

    		 No significant fluctuation The engine is running at constant speed
    Motor Actual Current

    Current to motor/

    Min.: -327.68 A

    Max.: 327.67 A

    		 Value changes in proportion to steering effort The engine is running and power steering is in operation
    Command Value Current

    Requested current to motor/

    Min.: -327.68 A

    Max.: 327.67 A

    		 Value changes in proportion to steering effort The engine is running and power steering is in operation
    Thermistor Temperature

    ECU substrate temperature/

    Min.: -50.0°C (-58°F)

    Max.: 150.0°C (302°F)

    		 -50.0 to 150.0°C (-58 to 302°F) -
    PIG Power Supply

    Power source voltage to activate motor/

    Min.: 0.0000 V

    Max.: 20.1531 V

    		 11 to 14 V The engine is running
    IG Power Supply

    ECU power source voltage/

    Min.: 0.0000 V

    Max.: 20.1531 V

    		 11 to 14 V The engine is running
    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

    		 -
    Steering Wheel Torque

    Steering wheel torque/

    Min.: -7.00 Nm

    Max.: 7.00 Nm

    		 Value changes in proportion to steering effort The engine is running and power steering is in operation
    Torque Sensor 1 Output

    Torque sensor 1 output value/

    Min.: 0.0000 V

    Max.: 4.9725 V

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

    Torque sensor 2 output value/

    Min.: 0.0000 V

    Max.: 4.9725 V

    		 2.3 to 2.7 V The engine is running and steering wheel not turned (without load)
    1.2 to 2.5 V The engine is running and steering wheel turned to right with vehicle stopped
    2.5 to 3.8 V The engine is running and steering wheel turned to left with vehicle stopped
    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 The engine is running and steering wheel not 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 The engine is running and steering wheel not turned (without load)
    Motor Terminal Volt (+)

    Motor terminal M1 voltage/

    Min.: 0.0 V

    Max.: 25.5 V

    		 11 to 14 V The engine is running and steering wheel turned to right
    6 to 11 V The engine is running and steering wheel turned to left
    Motor Terminal Volt (-)

    Motor terminal M2 voltage/

    Min.: 0.0 V

    Max.: 25.5 V

    		 6 to 11 V The engine is running and steering wheel turned to right
    11 to 14 V The engine is running and steering wheel turned to left
    IG ON/OFF Times

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

    Min.: 0 times

    Max.: 65535 times

    		 - This value indicates the number of times of IG ON/OFF after the latest DTC detection
    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

    Status of the Record of Engine Revolution Signal Interrupt/

    Unrec or Rec

    		 Unrec -
    Spd Sig Invalid Record

    Vehicle speed signal invalid record/

    Unrec or Rec

    		 Unrec -
    Battery Voltage Lo Record

    Battery voltage drop record/

    Min.: 0 times

    Max.: 65535 times

    		 0 times -
    Stop & Start Ctrl Mode

    Status of stop and start system control mode/

    IG/Run/Stopreq/Stop/Restart

    IG: Ignition switch ON (engine stopped)

    Run: Engine running

    Stopreq: Transition to idling stop

    Stop: Idling stop

    Restart: Engine restarting

    		 -
    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 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 ignition 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

    		 - -
    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, DC-DC Malf, Vhcl Spd Sig Malf, Batt Vol Keep

    		 - -
    Record 1 Key Cycle

    Number of times that the ignition switch was turned ON 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 ignition switch was turned ON 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, DC-DC Malf, Vhcl Spd Sig Malf, Batt Vol Keep

    		 - -
    Record 2 Key Cycle

    Number of times that the ignition switch was turned ON 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 ignition switch was turned ON 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, DC-DC Malf, Vhcl Spd Sig Malf, Batt Vol Keep

    		 - -
    Record 3 Key Cycle

    Number of times that the ignition switch was turned ON 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 ignition switch was turned ON before Assist Limit Record 3 was stored/

    Min.: 0.0 s

    Max.: 53687091.1 s

    		 - -
    Current Key Cycle

    Number of times that the ignition switch was turned to ON since Assist Limit Record 1 was stored/

    Min.: 0 times

    Max.: 65535 times

    		 - -
    Current Key Cycle Elapsed Time

    Period of time that elapsed after Assist Limit Record 1 was stored before the ignition switch was turned to ON/

    Min.: 0.0 s

    Max.: 53687091.1 s

    		 - -
    Steering Angle

    Steering angle value/

    Min.: -3072.0 deg

    Max.: 3070.5 deg

    		 - During steering operation: Changes in proportion with steering wheel rotation
    The Number of DTCs

    Number of detected DTCs when freeze frame data stored/

    Min.: 0

    Max.: 255

    		 0 to 255 -