Last Modified: 05-08-2025 6.11:8.1.0 Doc ID: RM100000001H5IB
Model Year Start: 2019 Model: RAV4 HV Prod Date Range: [02/2019 -           ]
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): ECM Communication Stop Mode; 2019 - 2025 MY RAV4 HV [02/2019 -        ]

ECM Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

ECM Communication Stop Mode

Any of the following conditions are met:

  • Communication stop for "ECM (Engine)" is indicated on the "Communication Bus Check" screen of the Techstream.

    Click here 2019 - 2020 MY RAV4 HV [02/2019 - 06/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE 2020 MY RAV4 HV [06/2020 - 08/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE 2021 MY RAV4 HV [08/2020 - 12/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE 2022 - 2025 MY RAV4 HV [12/2021 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE

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

    Click here 2019 - 2020 MY RAV4 HV [02/2019 - 06/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE 2020 MY RAV4 HV [06/2020 - 08/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE 2021 MY RAV4 HV [08/2020 - 12/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE 2022 - 2025 MY RAV4 HV [12/2021 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): PROBLEM SYMPTOMS TABLE

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

    Click here 2019 MY RAV4 HV [02/2019 - 10/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DTC COMBINATION TABLE 2020 MY RAV4 HV [10/2019 - 06/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DTC COMBINATION TABLE 2020 MY RAV4 HV [06/2020 - 08/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DTC COMBINATION TABLE 2021 MY RAV4 HV [08/2020 - 12/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DTC COMBINATION TABLE 2022 MY RAV4 HV [12/2021 - 10/2022]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DTC COMBINATION TABLE 2023 MY RAV4 HV [10/2022 - 10/2023]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DTC COMBINATION TABLE 2024 - 2025 MY RAV4 HV [10/2023 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DTC COMBINATION TABLE

  • ECM main wire or connector
  • ECM branch wire or connector
  • Power source circuit of ECM
  • ECM ground circuit
  • ECM

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.

    Click here 2019 - 2025 MY RAV4 HV [02/2019 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before measuring the resistance of the CAN bus, turn the ignition 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 10 minutes or more before measuring the resistance.
  • After turning the ignition 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.

    Click here 2019 - 2025 MY RAV4 RAV4 HV [11/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

  • Some parts must be initialized and set when replacing or removing and installing parts.

    Click here 2019 MY RAV4 RAV4 HV [02/2019 - 10/2019]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2020 MY RAV4 RAV4 HV [10/2019 - 06/2020]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2020 MY RAV4 RAV4 HV [06/2020 - 08/2020]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2024 - 2025 MY RAV4 RAV4 HV [10/2023 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

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

    DTC check procedure: Turn the ignition switch to ON 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.

    Click here 2019 MY RAV4 HV [02/2019 - 10/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2020 MY RAV4 HV [10/2019 - 06/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2020 MY RAV4 HV [06/2020 - 08/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2021 MY RAV4 HV [08/2020 - 12/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2022 MY RAV4 HV [12/2021 - 10/2022]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2023 MY RAV4 HV [10/2022 - 10/2023]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2024 MY RAV4 HV [10/2023 - 11/2024]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2025 MY RAV4 HV [11/2024 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM

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 WIRE (ECM MAIN WIRE AND BRANCH WIRE)

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

(b) Disconnect the ECM connector.

*a

Front view of wire harness connector

(to ECM)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A24-8 (CANH) - A24-18 (CANL)

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω

A24-7 (CAN+) - A24-17 (CAN-)

Cable disconnected from negative (-) auxiliary battery terminal

54 to 69 Ω

Result

Proceed to

OK

A

NG (No. 3 CAN junction connector main wire)

B

NG (No. 4 CAN junction connector branch wire)

C
B

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR
C

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR
A

2.

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A24-45 (EC) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A24-10 (E1) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A24-36 (E2) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

A24-54 (E1D1) - Body ground

Cable disconnected from negative (-) auxiliary battery terminal

Below 1 Ω

*a

Front view of wire harness connector

(to ECM)

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

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

Click here 2019 MY RAV4 RAV4 HV [02/2019 - 10/2019]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2020 MY RAV4 RAV4 HV [10/2019 - 06/2020]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2020 MY RAV4 RAV4 HV [06/2020 - 08/2020]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2024 - 2025 MY RAV4 RAV4 HV [10/2023 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A24-1 (BATT) - Body ground

Ignition switch off

11 to 14 V

A24-9 (+B) - Body ground

Terminal A24-15 (MREL) connected to body ground

11 to 14 V

A24-35 (+B2) - Body ground

Terminal A24-15 (MREL) connected to body ground

11 to 14 V

A24-2 (IGSW) - Body ground

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V
OK

REPLACE ECM 2019 - 2020 MY RAV4 HV [02/2019 - 08/2020]; A25A-FXS (ENGINE CONTROL): ECM: REMOVAL 2021 MY RAV4 HV [08/2020 - 12/2021]; A25A-FXS (ENGINE CONTROL): ECM: REMOVAL 2022 MY RAV4 HV [12/2021 - 10/2022]; A25A-FXS (ENGINE CONTROL): ECM: REMOVAL 2023 MY RAV4 HV [10/2022 - 10/2023]; A25A-FXS (ENGINE CONTROL): ECM: REMOVAL 2024 - 2025 MY RAV4 HV [10/2023 -        ]; A25A-FXS (ENGINE CONTROL): ECM: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR