Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Data List / Active Test

DATA LIST / ACTIVE TEST

NOTICE:

  • 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.
  • When diagnosing symptoms such as hesitation, rough idle, or other small symptoms using vehicle control history, compare data extracted from the same vehicle model in the same conditions and make sure to analyze all data in its entirety before making a diagnosis.

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.

DATA LIST

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Radar Cruise 1*1 or Radar Cruise 2*2 / Data List.

  • *1: Output from the ECM
  • *2: Output from the forward recognition camera

(e) Read the Data List according to the display on the Techstream.

Powertrain > Cruise Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Cruise Vehicle Speed

Vehicle speed

Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)

Actual vehicle speed

-

Cruise Memory Vehicle Speed

Stored vehicle speed

Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)

Stored vehicle speed

-

Cruise Request Throttle Opening Angle

Cruise requested position

0.00 to 124.99 deg

Changes depending on the conditions of the dynamic radar cruise control system

-

Vehicle Acceleration

Acceleration condition while driving the vehicle

-13.10 to 13.10 m/s2

Current value displayed

-

Cruise Target Acceleration

Target acceleration while in cruise control mode

-13.10 to 13.10 m/s2

Current value displayed

-

Driving Support ECU Target Acceleration

-

-

-

Cannot be used

Acceleration Continuation Decision

-

-

-

Cannot be used

Output Driving Force

-

-

-

Cannot be used

Cruise Request Driving Force

Cruise request torque signal

-10.00 to 9.92 kN

Changes depending on the conditions of the dynamic radar cruise control system

-

Cruise Request Driving Force Feedback Status

-

-

-

Cannot be used

Cruise Control Permission Condition

-

-

-

Cannot be used

Cruise Control Condition

-

-

-

Cannot be used

Cruise Control Mode

Cruise control mode condition

Vehicle Distance Control Mode (All Speed), Vehicle Distance Control Mode or Constant Speed Control Mode

Vehicle Distance Control Mode (All Speed): Vehicle distance control mode (All Speed) operating

Vehicle Distance Control Mode: Vehicle distance control mode operating

Constant Speed Control Mode: Constant speed control mode operating

-

Cruise Request Gear Position

Shift request from ECM

None or 255 Gear

Shift request from cruise control system

-

Cruise Acceleration and Deceleration Operation Condition

-

-

-

Cannot be used

Cancel Switch

CANCEL switch status

OFF or ON

OFF: CANCEL switch off

ON: CANCEL switch on

-

-SET Switch

-SET switch status

OFF or ON

OFF: -SET switch off

ON: -SET switch on

-

+RES Switch

+RES switch status

OFF or ON

OFF: +RES switch off

ON: +RES switch on

-

Cruise Main Switch Operation Condition

Cruise control main switch status

OFF or ON

OFF: Cruise control main switch (ON-OFF) off

ON: Cruise control main switch (ON-OFF) on

-

Cruise Ready Main-CPU

Cruise control system standby condition

OFF or ON

OFF: Cruise control main switch (ON-OFF) off

ON: Cruise control main switch (ON-OFF) on

-

Cruise Ready Sub-CPU

Cruise control system standby condition

OFF or ON

OFF: Cruise control main switch (ON-OFF) off

ON: Cruise control main switch (ON-OFF) on

-

Accelerator Pedal

Condition of the accelerator pedal during cruising

OFF or ON

OFF: Accelerator pedal released

ON: Accelerator pedal depressed

-

Cruise Brake Cancel Switch

Cruise control brake cancel condition

OFF or ON

OFF: Brake pedal released

ON: Brake pedal depressed

-

Stop Light Switch Main-CPU

Stop light switch signal

OFF or ON

OFF: Brake pedal released

ON: Brake pedal depressed

-

Stop Light Switch Sub-CPU

-

-

-

Cannot be used

Request Manual Cancel

-

-

-

Cannot be used

Request Automatic Cancel

-

-

-

Cannot be used

Cruise Brake Control Decision

Cruise brake control decision

OFF or ON

OFF: Cruise brake deactivated

ON: Cruise brake activated

-

Cruise Brake Control Permission Condition

-

-

-

Cannot be used

Cruise Indicator

Cruise control indicator status

OFF or ON

OFF: Cruise control indicator turns off

ON: Cruise control indicator illuminates

-

Wheel Speed Sensor and Deceleration Sensor

Speed sensor signal and deceleration sensor signal condition

Avail or Not Avl

Avail: Speed sensor signal and deceleration sensor signal available

Not Avl: Speed sensor signal and deceleration sensor signal not available

-

Gradient of Road Surface

-

-

-

Cannot be used

Powertrain > Radar Cruise2 > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Total Distance Traveled

-

-

-

Cannot be used

Total Distance Traveled - Unit

-

-

-

Cannot be used

Cruise Control Main Switch

Cruise control main switch status

OFF or ON

OFF: Cruise control main switch (ON-OFF) off

ON: Cruise control main switch (ON-OFF) on

-

Vehicle-to-vehicle Distance Control Switch

Vehicle-to-vehicle distance control switch signal

OFF or ON

OFF: Vehicle-to-vehicle distance control switch not pushed

ON: Vehicle-to-vehicle distance control switch pushed

-

Cruise Control Mode

Cruise control mode signal

Vehicle-to-vehicle Distance Control (All Speed), Vehicle-to-vehicle Distance Control (Hi Speed) or Constant Speed Control

Vehicle-to-vehicle Distance Control (All Speed): Vehicle-to-vehicle distance control mode (w/ Full-speed range following function)

Vehicle-to-vehicle Distance Control (Hi Speed): Vehicle-to-vehicle distance control mode (w/o Full-speed range following function)

Constant Speed Control: Constant speed mode

-

Vehicle Speed

Vehicle speed

Min.: 0.00 km/h (0 mph), Max.: 327.67 km/h (204.79 mph)

Actual vehicle speed

-

Yaw Rate Sensor Signal

Yaw rate value

Min.: -100.00 deg/s, Max.: 100.00 deg/s

Actual yaw rate value

-

Steering Angle Signal

Steering sensor signal

Min.: -3072.0 deg, Max.: 3070.5 deg

Increase: Turning left

Decrease: Turning right

-

Zero Point of Steering Angle Memorized in Steering Angle Sensor

Zero point steering angle sensor

Min.: -3072.0 deg, Max.: 3070.5 deg

Actual zero point steering angle

-

Estimated Vehicle Acceleration

Estimated Vehicle Acceleration

Min.: -5.00 m/s2, Max.: 5.00 m/s2

Current value displayed

-

Accelerator Pedal Idle

Accelerator pedal idle position signal

OFF or ON

OFF: Accelerator pedal depressed

ON: Accelerator pedal released

-

Forward Vehicle Distance

Distance to preceding vehicle

Min.: 0 m, Max.: 255 m

Current value displayed

-

Forward Vehicle Relative Speed

Relative speed against preceding vehicle

-128 to 127 km/h

Current value displayed

-

Cruise Warning Request

Forward vehicle approach warning signal

OFF or ON

OFF: Forward vehicle not approaching

ON: Forward vehicle approaching

-

Radar Transmitting

Millimeter wave radar sensor assembly operation signal

OFF or ON

OFF: Millimeter wave radar sensor assembly signal stopped

ON: Millimeter wave radar sensor assembly signal sent

-

Vehicle Information (Conv/HV)

Vehicle Information (Conv/HV)

Unknown, Conv or HV

-

-

Vehicle Information (Steering Wheel Position)

Vehicle Information (Steering Wheel Position)

Unknown, Left or Right

-

-

Vehicle Information (Brake Type)

Vehicle Information (Brake Type)

Unknown, Other, V series of Except V3H or V3H

-

-

Accelerator Over Ride

Accelerator pedal position signal during cruising

OFF or ON

OFF: Accelerator over ride OFF

ON: Accelerator over ride ON

-

Front Radar Sensor High Temperature

Millimeter wave radar sensor assembly high temperature abnormality

Normal or High Temperature

Normal: Millimeter wave radar sensor assembly temperature is normal

High Temperature: Millimeter wave radar sensor assembly temperature is high

  • "High Temperature" displayed when the millimeter wave radar sensor assembly is in the following condition
    • When the ambient temperature of the millimeter wave radar sensor assembly is 70°C (158°F) or more, such as when the vehicle is left alone in an extremely hot environment
  • When "High Temperature" is displayed, and the dynamic radar cruise control system is in one of the following conditions
    • X2027 in the vehicle control history (Front Radar Sensor Outside Guaranteed Operating Temperature) is stored
    • "Radar Cruise Control Unavailable" is displayed on the multi-information display
  • If "High Temperature" is displayed, refer to X2027 in the front radar sensor system vehicle control history

Front Radar Sensor Low Voltage

Millimeter wave radar sensor assembly low voltage abnormality

Normal or Low Voltage

Normal: Millimeter wave radar sensor assembly voltage is normal

Low Voltage: Millimeter wave radar sensor assembly voltage is low

  • "Low Voltage" displayed when the millimeter wave radar sensor assembly is in the following condition
    • When the input voltage is approximately 8 V or less, immediately after turning the engine switch is started
  • When "Low Voltage" is displayed, and the dynamic radar cruise control system is in one of the following conditions
    • X2028 in the vehicle control history (Front Radar Sensor Outside Guaranteed Operating Voltage) is stored
    • "Radar Cruise Control Unavailable" is displayed on the multi-information display
  • If "Low Voltage" is displayed, refer to X2028 in the front radar sensor system vehicle control history

Radar Cruise Control System Malfunction

Dynamic radar cruise control system warning indication

Normal or Abnormal

Normal: Dynamic radar cruise control system warning indication (Malfunction not detected)

Abnormal: Dynamic radar cruise control system warning indication (Malfunction detected)

-

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

ACTIVE TEST

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus:

(1) for Radar Cruise 2: Powertrain / Radar Cruise 2 / Active Test.

(2) for Combination Meter: Body Electrical / Combination Meter / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Powertrain > Radar Cruise2 > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Radar Cruise Proximity Warning Buzzer

Dynamic radar cruise control system approach warning buzzer

Not Active or Active

Test possible at vehicle speed of 0 km/h (0 mph)

Radar Cruise Stop Keeping Announce Buzzer

Dynamic radar cruise control suspended warning buzzer

Not Active or Active

Test possible at vehicle speed of 0 km/h (0 mph)

Body Electrical > Combination Meter > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Meter Display 1

Multi-information display

OFF or All

-

    Fail-safe Chart
    FAIL-SAFE CHART Automatic Cancel Control (a) When the vehicle is being driven in constant speed control mode and any of the following malfunctions occur, control of vehicle speed by the dynamic cruise ...

    Diagnostic Trouble Code Chart
    DIAGNOSTIC TROUBLE CODE CHART Dynamic Radar Cruise Control System DTC No. Detection Item MIL DTC Output from Link P057113 Brake Switch "A" Circuit Open Does not come on ECM ...

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

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