Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001Q0BC
Model Year Start: 2021 Model: Avalon HV Prod Date Range: [08/2020 -           ]
Title: METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for HV Model): Tachometer Malfunction; 2021 - 2022 MY Avalon HV [08/2020 -        ]

Tachometer Malfunction

DESCRIPTION

In this circuit, the combination meter assembly receives engine rpm data signal from the hybrid vehicle control ECU via CAN communication. The combination meter assembly displays the engine speed calculated based on the data received from the hybrid vehicle control ECU.

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 replacing the hybrid vehicle control ECU, refer to Registration.

    Click here 2021 - 2022 MY Avalon HV [08/2020 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication DTCs are output.

Click here 2021 MY Avalon HV [08/2020 - 08/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2022 MY Avalon HV [08/2021 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM

Result

Proceed to

CAN communication DTCs are not output

A

CAN communication DTCs are output

B
B

GO TO CAN COMMUNICATION SYSTEM

A

2.

CHECK FOR DTC (HYBRID CONTROL SYSTEM)

(a) Check if hybrid control system DTCs are output.

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTCs are output

B
B

GO TO HYBRID CONTROL SYSTEM 2021 MY Avalon HV [08/2020 - 08/2021]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): DIAGNOSTIC TROUBLE CODE CHART 2022 MY Avalon HV [08/2021 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): DIAGNOSTIC TROUBLE CODE CHART

A

3.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Hybrid Control / Data List.

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

Powertrain > Hybrid Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Engine Speed

Engine speed

-

Engine stopped:

0 rpm

While engine running at a constant speed:

No significant fluctuation

-

Powertrain > Hybrid Control > Data List

Tester Display

Engine Speed

OK:

Engine speed displayed on the Techstream is almost the same as the tachometer indication.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE COMBINATION METER ASSEMBLY 2021 MY Avalon Avalon HV [08/2020 - 08/2021]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL 2022 MY Avalon Avalon HV [08/2021 -        ]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL