Electronic Power Steering (Diagnostics - Introduction): Other Lexus IS II facelift

FREEZE FRAME DATA

1. FREEZE FRAME DATA NOTE: It is difficult to show the specified values (judgement values) clearly because freeze frame data values change significantly due to differences in measurement conditions, surroundings, or vehicle conditions. For this reason, there may be a problem even when the values are within specifications. Turn the engine switch on (IG) and park the vehicle on level ground. Check the freeze frame data by using the Techstream. Connect the Techstream (with CAN VIM) to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Check the freeze frame data. Enter the following menus: Chassis / EMPS / Utility / Freeze Frame Data. EMPS Tester Display Item Description/Range (Display) Inspection Condition Reference Value Meter Vehicle Velocity Vehicle speed from meter / Min.: 0 km/h (0 mph), Max.: 300 km/h (186 mph) Vehicle is stopped Vehicle is driven at a constant speed 0 km/h (0 mph) No significant fluctuation Engine Revolution Engine revolution/ Min.: 0 RPM, Max.: 12800 RPM Engine is running at a constant speed No significant fluctuation Motor Actual Current Amount of current to motor/ Min.: -327.68 A, Max.: 327.67 A Power steering is in operation Value changes in proportion to steering effort Command Value Current Demanded amount of current to motor/ Min.: -327.68 A, Max.: 327.67 A Power steering is in operation Value changes in proportion to steering effort Steering Angle Velocity Steering angle speed/ Min.: -32768 deg/s, Max.: 32767 deg/s Steering wheel is turned Value changes in proportion to steering speed 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 Power steering is in operation 10 to 14 V IG Power Supply ECU power source voltage/ Min.: 0 V, Max.: 20.1531 V Engine switch on (IG) 10 to 14 V Torque Sensor 1 Output Torque sensor 1 rotation angle/ Min.: 0 deg, Max.: 1441.77 deg Steering wheel is turned Value changes from 0 to 1441.77° every 22.5° of steering angle Torque Sensor 2 Output Torque sensor 2 rotation angle/ Min.: 0 deg, Max.: 1441.77 deg Steering wheel is turned Value changes from 0 to 1441.77° every 22.5° of steering angle TRQ1 Zero Point Value Zero point value of torque sensor 1/ Min.: 0 deg, Max.: 1441.77 deg Steering wheel is not turned (without load) Values differ depending on vehicle TRQ2 Zero Point Value Zero point value of torque sensor 2/ Min.: 0 deg, Max.: 1441.77 deg Steering wheel is not turned (without load) Values differ depending on vehicle Steering Wheel Torque Steering torque/ Min.: -327.68 N*m, Max.: 7.0 N*m Steering wheel is turned Value changes in proportion to steering effort Motor Rotation Angle Motor rotation angle/ Min.: 0 deg, Max.: 1441.77 deg Steering wheel is turned Value changes from 0 to 360° every 5° of steering angle Command Val Current 2 Demanded amount of current to motor 2/ Min.: -327.68 A, Max.: 327.67 A - - PIG2 Voltage Motor drive voltage after pressurization/ Min.: 0 V, Max.: 45.955 V Power steering is in operation 27 to 34 V Motor Voltage Motor power source voltage/ Min.: 0 V, Max.: 45.955 V Power steering is in operation 27 to 34 V Motor Terminal Volt (U) Motor terminal voltage (U phase)/ Min.: 0 V, Max.: 46.667 V Power steering is in operation 0 to 34 V Motor Terminal Volt (V) Motor terminal voltage (V phase)/ Min.: 0 V, Max.: 46.667 V Power steering is in operation 0 to 34 V Motor Terminal Volt (W) Motor terminal voltage (W phase)/ Min.: 0 V, Max.: 46.667 V Power steering is in operation 0 to 34 V 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)

FAIL-SAFE CHART

If a problem occurs in the electronic power steering system, the P/S warning light will come on in the combination meter and steering power assistance will be stopped, fixed at a particular point, or decreased simultaneously to protect the system.

HINT

The amount of power assistance 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 that case, the amount of power assistance will return to normal if the steering wheel is not turned for approximately 10 minutes with the engine idling.