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Last Modified: 11-27-2007 1.6 J
Service Category: Vehicle Interior Section: Meter/Gauge/Display
Model Year: 2008 Model: LX570 Doc ID: RM000002ZM6005X
Title: METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: DESCRIPTION (2008 LX570)

Speedometer Malfunction

DESCRIPTION

The combination meter receives vehicle speed signals from the skid control ECU via the CAN line. The vehicle speed sensor outputs a voltage that varies according to the vehicle speed. The skid control ECU supplies power to the vehicle speed sensor. The skid control ECU calculates vehicle speed based on the pulses of the voltage.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK CAN COMMUNICATION

(a) Check for DTCs METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

Result

Result

Proceed to

CAN communication DTC is not output

A

CAN communication DTC is output

B
A

2.

CHECK VEHICLE STABILITY CONTROL SYSTEM (VEHICLE SPEED)

(a) Check for DTCs BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

OK:

No DTCs are output.

OK

3.

PERFORM ACTIVE TEST USING TECHSTREAM (SPEEDOMETER)

(a) Operate the Techstream according to the display and select the Active Test METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: DATA LIST / ACTIVE TEST (2008 LX570) .

Combination Meter

Tester Display

Test Part

Control Range

Diagnostic Note

Speed Meter Operation

Speedometer

0, 40, 80, 120, 160, 200, 240 or 280

Perform the test with the vehicle stopped and the engine idling.

HINT:

  • Make sure that the vehicle is stopped and the engine is idling. The doors will be locked automatically when performing the speedometer Active Test. This is a normal function.
  • The displayed value has the same units (km/h, mph) as the main scale of the vehicle speedometer.
  • The needle position should be within the acceptable tolerance.

    OK:

    Needle indication is normal.

OK

4.

READ VALUE USING TECHSTREAM (VEHICLE SPEED)

(a) Operate the Techstream according to the display and select the Data List METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: DATA LIST / ACTIVE TEST (2008 LX570) .

Combination Meter

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Vehicle Speed meter

Vehicle speed/Min.: 0 (0), Max.: 255 (158)

Almost same as actual speed (when driving)

Unit: km/h (mph)

OK:

Vehicle speed displayed on the Techstream is almost the same as actual vehicle speed measured using speedometer tester (calibrated chassis dynamometer).

OK

5.

READ VALUE USING TECHSTREAM (WHEEL SPEED SENSOR)

(a) Operate the Techstream according to the display and select the Data List BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DATA LIST / ACTIVE TEST (2008 LX570) .

ABS/VSC/TRAC

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

FR Wheel Speed

Wheel speed sensor FR reading/Min.: 0 (0), Max.: 326 (202)

Actual wheel speed

A similar speed is indicated on the speedometer.

FL Wheel Speed

Wheel speed sensor FL reading/Min.: 0 (0), Max.: 326 (202)

Actual wheel speed

A similar speed is indicated on the speedometer.

RR Wheel Speed

Wheel speed sensor RR reading/Min.: 0 (0), Max.: 326 (202)

Actual wheel speed

A similar speed is indicated on the speedometer.

RL Wheel Speed

Wheel speed sensor RL reading/Min.: 0 (0), Max.: 326 (202)

Actual wheel speed

A similar speed is indicated on the speedometer.

OK:

Wheel speed displayed on the Techstream is almost the same as actual wheel speed measured using speedometer tester (calibrated chassis dynamometer).

OK