Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Lost Communication with ECM / PCM (U0100,U0140,U0142,U0155,U0293)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System(for Start Function, Hv Model) / Lost Communication with ECM / PCM (U0100,U0140,U0142,U0155,U0293)

DESCRIPTION

These DTCs are stored when there is a CAN communication malfunction between the ECM, certification ECU (smart key ECU assembly), hybrid vehicle control ECU, main body ECU (multiplex network body ECU) or combination meter assembly, and data from the option connector (bus buffer ECU) cannot be received.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
U0100	Lost Communication with ECM / PCM	CAN communication error between certification ECU (smart key ECU assembly) and ECM (1-trip detection logic*)	ECM	Turn the power switch on (IG) and wait at least 10 seconds.
U0140	Lost Communication with Main Body ECU	CAN communication malfunction between certification ECU (smart key ECU assembly) and main body ECU (multiplex network body ECU) (1-trip detection logic*)	Main body ECU (multiplex network body ECU)	Always
U0142	Lost Communication with Main Body ECU	CAN communication malfunction between certification ECU (smart key ECU assembly) and main body ECU (multiplex network body ECU) (1-trip detection logic*)	Main body ECU (multiplex network body ECU)	Always
U0155	Lost Communication with Combination Meter	CAN communication malfunction between certification ECU (smart key ECU assembly) and combination meter assembly (1-trip detection logic*)	Combination meter assembly	Turn the power switch on (IG) and wait at least 10 seconds.
U0293	Lost Communication with Hybrid Vehicle Control System	CAN communication error between certification ECU (smart key ECU assembly) and hybrid vehicle control ECU (1-trip detection logic*)	Hybrid vehicle control ECU	Turn the power switch on (IG) and wait at least 10 seconds.

*: Only detected while a malfunction is present.

Vehicle Condition and Fail-safe Function when Malfunction Detected

DTC Code	Vehicle Condition when Malfunction Detected	Fail-safe Function when Malfunction Detected
U0100	There is no effect on vehicle behavior.	-
U0140 U0142	Doors cannot be locked or unlocked. The warning (wireless buzzer) does not sound.	-
U0155	The warning (meter buzzer) does not sound and no warning messages displayed on the multi-information display.	-
U0293	The warning (meter buzzer) does not sound and no warning messages displayed on the multi-information display.	-

Related Data List and Active Test Items

DTC No.

Data List and Active Test

U0100

U0140

U0142

U0155

U0293

CAUTION / NOTICE / HINT

NOTICE:

When using the Techstream with the power switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

HINT:

When the cable is disconnected and reconnected to the negative (-) auxiliary battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs and note any DTCs that are output.

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GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

Terminals Of Ecu

Unable to Unlock Steering Wheel (Hybrid Control System cannot Start)

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DESCRIPTION This DTC is stored if internal or external brake fluid leaks are detected due to improper sealing in the brake actuator (brake booster with master cylinder assembly) or brake booster pump assembly. Internal leaks are suspected if the pump motor operates frequently without braking. DTC No ...

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Lost Communication with ECM / PCM (U0100,U0140,U0142,U0155,U0293)

Terminals Of Ecu

Unable to Unlock Steering Wheel (Hybrid Control System cannot Start)

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