Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Problem Symptoms Table

Cannot enter EV drive mode

CAN Communication System

Pattern Select Switch EV Mode Circuit

EV drive mode switch (Electric parking brake switch assembly)

Combination meter assembly

EV mode indicator light does not illuminate

Combination meter assembly

EV drive mode switch (Electric parking brake switch assembly)

Pattern Select Switch EV Mode Circuit

EV mode indicator light does not turn off

Combination meter assembly

EV drive mode switch (Electric parking brake switch assembly)

Pattern Select Switch EV Mode Circuit

Cannot enter ECO mode

CAN Communication System

ECO mode switch (Electric parking brake switch assembly)

Pattern Select Switch ECO Mode Circuit

Combination meter assembly

ECO mode indicator light does not illuminate

ECO mode switch (Electric parking brake switch assembly)

Pattern Select Switch ECO Mode Circuit

Combination meter assembly

ECO mode indicator light does not turn off

ECO mode switch (Electric parking brake switch assembly)

Pattern Select Switch ECO Mode Circuit

Combination meter assembly

Cannot enter SPORT mode

CAN Communication System

SPORT mode switch (Electric parking brake switch assembly)

Pattern Select Switch SPORT Mode Circuit

Combination meter assembly

SPORT mode indicator light does not illuminate

SPORT mode switch (Electric parking brake switch assembly)

Pattern Select Switch SPORT Mode Circuit

Combination meter assembly

SPORT mode indicator light does not turn off

SPORT mode switch (Electric parking brake switch assembly)

Pattern Select Switch SPORT Mode Circuit

Combination meter assembly

Hunting (Poor idle)

Check for Diagnosis Related Information*3

Drive Start Control

Hesitation and/or poor acceleration

Check for Diagnosis Related Information*3

Brake Override System

Drive Start Control

Shift range position cannot be changed by shifting to "+" or "-"

Transmission Control Switch Circuit

Shift Paddle Switch Circuit

Shift position indicator is malfunctioning

Indicator Circuit

Power switch does not turn on (READY).

Check Vehicle Control History (wrong assembly confirmation)*1

Smart Key System (for start function)

ECU Power Source Circuit (Hybrid control system)

Hybrid vehicle control ECU

ECM

Loud rattle from hybrid vehicle transaxle

Check idle learning

Transmission input damper assembly

Hybrid vehicle transaxle assembly

Engine misfire

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"Maintenance Required for Traction Battery Cooling Parts See Owner's Manual" is displayed on the multi-information display. *2

1. Make sure the HV battery cooling system intake port is not blocked.

-

2. Make sure there are no gaps between the connecting parts of the ducts.

-

3. Clean the No. 1 hybrid battery intake filter.

Check for entry of foreign matter.

4. Clear the DTCs to reset the learning values even if no DTCs are stored.

Abnormal sound is heard from the area around the No. 1 hybrid battery intake duct.

1. Make sure the HV battery cooling system intake port is not blocked.

-

2. Make sure there are no gaps between the connecting parts of the ducts.

-

3. Clean the No. 1 hybrid battery intake filter.

Check for entry of foreign matter.

4. Clear the DTCs to reset the learning values even if no DTCs are stored.

Engine stops and starts less frequently.

Check Vehicle Control History

(Limit to Charge / Discharge Control Value by Hybrid Battery Temperature High)

Engine speed returns to idle slowly after accelerator pedal is fully released.

Check Vehicle Control History

(Limit to Charge / Discharge Control Value by Hybrid Battery Temperature High)

Hybrid control system

P312387

Motor generator control system

P31241F

P312487