Lexus RX (RX 350L, RX450h) 2016-2022 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.

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 OF 4WD ECU ASSEMBLY

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Chassis / Four Wheel Drive / Data List.

(e) According to the display on the Techstream, read the Data List.

Chassis > Four Wheel Drive > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

4WD Warning Light

AWD warning (multi-information display)

OFF or ON

OFF: Warning off

ON: Warning on

-

4WD LOCK Light

AWD lock mode indicator light

OFF or ON

OFF: AWD lock mode indicator light off

ON: AWD lock mode indicator light on

-

Stop Light SW

Stop light switch

OFF or ON

OFF: Brake pedal released

ON: Brake pedal depressed

-

4WD LOCK Switch

AWD lock switch

OFF or ON

OFF: AWD lock mode switch released

ON: AWD lock mode switch pressed and held

-

Lateral G

Lateral G

Min.: -25.10 m/s2

max.: 24.90 m/s2

During turning: Changes in accordance with acceleration

-

Forward and Rearward G

Forward and Rearward G

Min.: -25.10 m/s2

Max.: 24.90 m/s2

During acceleration/deceleration: Changes in accordance with acceleration

-

Yaw Rate Value

Yaw rate value

Min.: -128°/s

Max.: 127°/s

Vehicle stopped: 0°/s

During turning: Changes in accordance with yaw

-

Steering Angle Value

Steering angle value

Min.: -3276.8°

Max.: 3276.7°

During steering operation: Changes in accordance with steering wheel rotation

Left turn: Increases

Right turn: Decreases

FR Wheel Speed

Front wheel speed sensor RH reading

Min.: 0 km/h (0 mph)

Max.: 326 km/h (202 mph)

Vehicle stopped: 0 km/h (0 mph)

No large fluctuations when driving at a constant speed.

FL Wheel Speed

Front wheel speed sensor LH reading

Min.: 0 km/h (0 mph)

Max.: 326 km/h (202 mph)

Vehicle stopped: 0 km/h (0 mph)

No large fluctuations when driving at a constant speed.

RR Wheel Speed

Rear wheel speed sensor RH reading

Min.: 0 km/h (0 mph)

Max.: 326 km/h (202 mph)

Vehicle stopped: 0 km/h (0 mph)

No large fluctuations when driving at a constant speed.

RL Wheel Speed

Rear wheel speed sensor LH reading

Min.: 0 km/h (0 mph)

Max.: 326 km/h (202 mph)

Vehicle stopped: 0 km/h (0 mph)

No large fluctuations when driving at a constant speed.

Engine Coolant Temperature

Engine coolant temperature

Min.: 0°C (32°F)

Max.: 127.5°C (261.5°F)

Actual engine coolant temperature is displayed

-

Ambient Temperature

Vehicle ambient temperature

Min.: -128°C (-198.4°F)

Max.: 127°C (260.6°F)

Actual ambient temperature is displayed

-

Inspection Mode

Inspection mode

Other or Inspect

Other: Normal mode

Inspect: Inspection mode

-

SLC Solenoid Current

SLC solenoid (4WD linear solenoid) current

Min.: 0 A

Max.: 3 A

0 to 3 A

-

Number of DTC

Number of DTC recorded

0 to 255

0

-

ACTIVE TEST OF 4WD ECU ASSEMBLY

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.

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Chassis / Four Wheel Drive / Active Test.

(e) According to the display on the Techstream, perform the Active Test.

Chassis > Four Wheel Drive > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

4WD Warning Light

AWD warning (multi-information display)

Warning ON/OFF

Observe the multi-information display.

4WD LOCK Light

AWD lock mode indicator light

Indicator light OFF/ON

Observe the combination meter assembly

    Freeze Frame Data
    FREEZE FRAME DATA FREEZE FRAME DATA (a) When a DTC is stored, the 4WD ECU assembly stores the current vehicle state as Freeze Frame Data. HINT: When Freeze Frame Data is stored along with the DTC, ...

    Fail-safe Chart
    FAIL-SAFE CHART FAIL-SAFE FUNCTION If a malfunction is detected in the 4WD ECU assembly, the 4WD ECU assembly may stop AWD control and transfer all torque to the front wheels, or function in a such ...

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