Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Hybrid Vehicle Control ECU Communication Stop Mode

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Power Source, Network / Networking / Can Communication System(for Hv Model) / Hybrid Vehicle Control ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Hybrid Vehicle Control ECU Communication Stop Mode

Any of the following conditions are met:

  • Communication stop for "Hybrid Vehicle Control" is indicated on the "Communication Bus Check" screen of the Techstream.

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  • Communication stop history for "Hybrid Vehicle Control" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Hybrid Vehicle Control" is 6 or more.)

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  • Communication system DTCs (DTCs that start with U) that correspond to "Hybrid Vehicle Control ECU Communication Stop Mode" in "DTC Combination Table" are output.

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  • Hybrid vehicle control ECU branch line or connector
  • Power source circuit of hybrid vehicle control ECU
  • Hybrid vehicle control ECU ground circuit
  • Hybrid vehicle control ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

NOTICE:

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

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  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the power switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.

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  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the hybrid vehicle control ECU, refer to Registration.

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HINT:

  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE

1.

CHECK FOR OPEN IN CAN BUS LINES (HYBRID VEHICLE CONTROL ECU BRANCH LINE)

(a) Disconnect the cable from the negative (-) auxiliary battery terminal.

(b) Disconnect the G47 hybrid vehicle control ECU connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Bus 2 Branch Lines

Tester Connection

Condition

Specified Condition

G47-25(CA1H) - G47-24(CA1L)

Cable disconnected from negative (-) auxiliary battery terminal

54 to 69 Ω
Bus 4 Branch Lines

Tester Connection

Condition

Specified Condition

G47-31(CA3P) - G47-30(CA3N)

Cable disconnected from negative (-) auxiliary battery terminal

54 to 69 Ω

*a

Front view of wire harness connector

(to Hybrid Vehicle Control ECU)
NG

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (HYBRID VEHICLE CONTROL ECU)
OK

2.

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the A23 hybrid vehicle control ECU connector.

(b) Reconnect the cable to the negative (-) auxiliary battery terminal.

(c) Measure the voltage according to the value(s) in the table below.

*a

Front view of wire harness connector

(to Hybrid Vehicle Control ECU)

-

-

Standard Voltage:

Tester Connection

Condition

Specified Condition

G47-3 (BATT) - Body ground

Power switch off

11 to 14 V

A23-3 (IG2) - Body ground

Power switch on (IG)

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK

3.

CHECK ECU POWER SOURCE CIRCUIT

(a) Check the ECU power source circuit.

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OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
    How To Proceed With Troubleshooting

    Main Body ECU Communication Stop Mode

    See More:

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

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