Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001H5IY
Model Year Start: 2019 Model: RAV4 HV Prod Date Range: [02/2019 - 06/2020]
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): Check Bus 2 Lines for Short Circuit; 2019 - 2020 MY RAV4 HV [02/2019 - 06/2020]

Check Bus 2 Lines for Short Circuit

DESCRIPTION

There may be a short circuit between the CAN main bus wire and/or CAN branch wire when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is below 54 Ω.

Symptom

Trouble Area
*: w/ Vehicle Proximity Notification System

Resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is below 54 Ω.
  • Short in CAN main bus wire
  • Short in CAN branch wire
  • Central gateway ECU (network gateway ECU)
  • ECM
  • Hybrid vehicle control ECU assembly
  • Inverter with converter assembly
  • Brake booster with master cylinder assembly (skid control ECU)
  • Vehicle approaching speaker controller*
  • No. 3 CAN junction connector

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 - 2024 MY RAV4 HV [02/2019 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • 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 1 minute 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 - 2024 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 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

  • 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

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 SHORT IN CAN BUS WIRES (NO. 3 CAN JUNCTION CONNECTOR)

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

(b) Disconnect the No. 3 CAN junction connector.

*a

Front view of wire harness connector

(to No. 3 CAN Junction Connector)

*b

to Central Gateway ECU (Network Gateway ECU)

*c

to Inverter with Converter Assembly (for AWD)

*d

to ECM

*e

to Inverter with Converter Assembly

*f

to Hybrid Vehicle Control ECU Assembly

*g

to Brake Booster with Master Cylinder Assembly (Skid Control ECU)

*h

to Vehicle Approaching Speaker Controller (w/ Vehicle Proximity Notification System)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to
*1: for AWD

*2: w/ Vehicle Proximity Notification System

G103-1 (CANH) - G103-11 (CANL)

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω

Central gateway ECU (network gateway ECU)

G103-2 (CANH) - G103-12 (CANL)*1

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

Inverter with converter assembly

G103-3 (CANH) - G103-13 (CANL)

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω

ECM

G103-4 (CANH) - G103-14 (CANL)

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

Inverter with converter assembly

G103-5 (CANH) - G103-15 (CANL)

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

Hybrid vehicle control ECU assembly

G103-7 (CANH) - G103-17 (CANL)

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

Brake booster with master cylinder assembly (skid control ECU)

G103-8 (CANH) - G103-18 (CANL)

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

Vehicle approaching speaker controller*2

Result

Proceed to

OK

A

NG (Central gateway ECU [network gateway ECU] CAN main wire)

B

NG (ECM CAN main wire)

C

NG (Wire to ECU or sensor)

D
A

REPLACE NO. 3 CAN JUNCTION CONNECTOR
C

GO TO STEP 3

D

GO TO STEP 4

B

2.

CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 3 CAN JUNCTION CONNECTOR)

(a) Reconnect the G103 No. 3 CAN junction connector.

(b) Disconnect the central gateway ECU (network gateway ECU) connector.

*a

Front view of wire harness connector

(to Central Gateway ECU [Network Gateway ECU])

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G72-18 (CA4H) - G72-17 (CA4L)

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω
OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 2019 MY RAV4 RAV4 HV [02/2019 - 10/2019]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL 2020 MY RAV4 RAV4 HV [10/2019 - 08/2020]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL

NG

REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 3 CAN JUNCTION CONNECTOR)

3.

CHECK FOR SHORT IN CAN BUS WIRES (ECM - NO. 3 CAN JUNCTION CONNECTOR)

(a) Reconnect the G103 No. 3 CAN junction connector.

(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
OK

REPLACE ECM

NG

REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (ECM - NO. 3 CAN JUNCTION CONNECTOR)

4.

CHECK FOR SHORT IN CAN BUS WIRES (ECU OR SENSOR)

(a) Reconnect all wire harness connectors.

(b) Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited branch line is connected.

Click here 2019 MY RAV4 HV [02/2019 - 10/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): TERMINALS OF ECU 2020 MY RAV4 HV [10/2019 - 06/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): TERMINALS OF ECU

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G72-18 (CA4H) - G72-17 (CA4L)

Cable disconnected from negative (-) auxiliary battery terminal

54 to 69 Ω

HINT:

  • If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
  • If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short in the wire harness and repair or replace the wire harness or connector if necessary.

*a

Component with harness connected

(Central Gateway ECU [Network Gateway ECU])
OK

REPLACE ECU OR SENSOR
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR