Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Speedometer Malfunction

DESCRIPTION

The combination meter assembly receives vehicle speed signals from the skid control ECU (brake booster with master cylinder assembly) via CAN communication. The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU (brake booster with master cylinder assembly). The skid control ECU (brake booster with master cylinder assembly) supplies power to the vehicle speed sensor. The skid control ECU (brake booster with master cylinder assembly) detects vehicle speed signals based on pulses of the voltage.

HINT:

Factors that affect the indicated vehicle speed include the tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
• Before starting the following inspection, inspect the speedometer and check that the tire size and air pressure are as specified.

  Tire size and air pressure: Click here

  Speedometer: Click here

PROCEDURE

(a) Check if CAN communication DTCs are output.

Click here

B

GO TO CAN COMMUNICATION SYSTEM

A

(a) Check if electronically controlled brake system DTCs are output.

B

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM

A

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.

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

OK:

Speedometer indication is normal.

OK

REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)

NG

REPLACE COMBINATION METER ASSEMBLY